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IMC 31 Group Name Theobroma cacao

Pound, F.J. (1938)
Cacao and Witchbroom Disease of South America with notes on other species of Theobroma. Archives of Cocoa Research 1: pp. 26-71.

Derivation: Iquitos Mixed Calabacillo (Mid Channel).
Collected by Pound.
Location: Iquitos, Peru.

Pound, 1938a [POU38A]. Main type - very large lagarta calabacillo pods, oval, very smooth, normal blanco. Seeds large, flat, losenge shaped. 'Hybrid group'-large pods, somewhat warty at stem end but smooth and round like calabacillo at the apex. Third group-small, oval, warty pods, dense flowering. Bartley, 1995a [BAR95A]. The common features of this group of clones are the high ovule numbers (65+) and a specific type of anthocyanin pigmentation in the stamens and base of the corolla. Posnette, 1945a [POS45A]. Petioles are of a type intermediate between those of Nanay (see NA) and Parinari (see PA) types; the constriction is usually short and narrow.

Notes: Pound, 1938a [POU38A]. Pods probably collected from at least two groups of trees which were free of Witches' Broom.

Bartley, 1995a [BAR95A]. They are probably the progenies of two trees, later propagated as the clones P 18 [POU] and P 21 [POU].

Pound, 1943b [POU43B]. 112 plants were planted at Marper farm.

Bartley, 1997a, [BAR97A] The progeny of the individual clones is not documented and it is important not to consider the IMC clones as one homogeneous group.

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Synonyms: IQUITOS MIXED 31

POPULATION

Motamayor, J.C. et al., 2008: 'Iquitos' Population; Subgroup: 'IMC I' Reference

Reference

Motamayor, J.C., Lachenaud, P., da Silva e Mota, J.W., Loor, R., Kuhn, D.N., Brown, J.S. & Schnell, R.J. 2008
Geographic and Genetic Population Differentiation of the Amazonian Chocolate Tree (Theobroma cacao L). PLoS ONE 3(10): e3311. doi:10.1371/journal.pone.0003311
Population SSR
Guiltinan, Mark, 2019: 'Iquitos' Population; Reference

Reference

Guiltinan, Mark 2019
Theobroma cacao Disease Resistance: Discovery and Functional Characterization of Genes Regulating Plant Immunity in Perennial Crops. NCBI
Notes

A project to establish a new scientific approach for use with perennial crop plants to identify candidate loci for disease resistance using Theobroma cacao. Leaf samples were collected from the La Montaña field site at the CATIE field station in Turrialba, Costa Rica. The study focused on four genetic groups (Guiana, Iquitos, Marañon, and Nanay) and variation in resistance to Phytophthora.
Last updated: November, 2022

plantscience.psu.edu/…

Disease Population Accession Data Project Data

GENOME/TRANSCRIPTOME DATA LINKS

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Guiltinan, Mark, 2019

Reference View Associated Data

BioProject: PRJNA558793 NCBI ENA FASTQ

Library Source: Genomic & Transcriptomic

Run: SRR14022540 NCBI ENA FASTQ

Library Source: Genomic

Experiment: SRX10399135

BioSample: SAMN12500394

SampleName: IMC-31

SampleSource: Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Costa Rica, Tree_ID: P000022

Run: SRR14022541 NCBI ENA FASTQ

Library Source: Genomic

Experiment: SRX10399134

BioSample: SAMN12500394

SampleName: IMC-31

SampleSource: Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Costa Rica, Tree_ID: P000022

Run: SRR9938271 NCBI ENA FASTQ

Library Source: Genomic

Experiment: SRX6686852

BioSample: SAMN12500394

SampleName: IMC-31

SampleSource: Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Costa Rica, Tree_ID: P000022

Run: SRR9938332 NCBI ENA FASTQ

Library Source: Genomic

Experiment: SRX6686791

BioSample: SAMN12500394

SampleName: IMC-31

SampleSource: Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Costa Rica, Tree_ID: P000022

Run: SRR9938333 NCBI ENA FASTQ

Library Source: Genomic

Experiment: SRX6686790

BioSample: SAMN12500394

SampleName: IMC-31

SampleSource: Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Costa Rica, Tree_ID: P000022

Run: SRR9938233 NCBI ENA FASTQ

Library Source: Transcriptomic

Experiment: SRX6686890

BioSample: SAMN12500394

SampleName: IMC-31

SampleSource: Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Costa Rica, Tree_ID: P000022

HELD IN

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United Kingdom, International Cocoa Quarantine Centre, Reading (ICQC,R): Current List ICQC,R Website; • Accession: RUQ 1449 ICQC,R; - Local Name: IMC 31
Costa Rica, Centro Agronómico Tropical de Investigación y Enseñanza (CATIE): List received in 2018 Reference

Reference

Allan Mata 2018
Accession list for the International Cacao Collection at CATIE (IC3). Personal communication.
Notes

Excel file received by email.; • Accession: 22165; - Local Name: IMC-31; - Year of Accession: 2008
Cote d'Ivoire, Centre National de Recherche Agronomique (CNRA): List received in 1989 Reference

Reference

Cote d'Ivoire - IRCC 1989
Liste des clones en collection. Unpublished Report, IRCC Bingerville, Cote d'Ivoire, Doc. No. 192. D. Clement, IRCC, Cote d'Ivoire. Personal Communication.
Notes

List of clones grouped as West African Amelonados, Lower Amazons, Venezuelan collections, French Guiana collections, Ecuadorian collections, local Trinitarios, other Trinitarios, upper Amazons and Criollos. Notes on origin, date and place of origin and nature of the material (cuttings, budwood, seed).; • Local Name: IMC 31; - Year of Accession: 1973
Ecuador, Estation Experimental Tropical Pichilingue: List received in 2012 Reference

Reference

EET - Pichilingue 2012
Accessions planted in EET - Pichilingue, Ecuador. Freddy Amores and Ignacio Sotomayor C, personal communication, February 2012.; • Local Name: IMC - 31; - Year of Accession: 1967; • Cross: IMC 31 x IMC 53; - Local Name: IMC - 31 x IMC -53
Malaysia, Agricultural Research Centre (ARC): List received in 1990 Reference

Reference

Malaysia - ARC Tuaran 1990
List of clones held in the Dept. of Agriculture's collection, at Sabah, Tuaran, Malaysia. E.B. Tay, Malaysian Cocoa Board, Malaysia. Personal Communication.; • Local Name: IMC 31
Trinidad and Tobago, International Cocoa Genebank, Trinidad (ICG,T): List received in 2011 Reference

Reference

CRU 2011
ICG,T accessions. CRU website.
Notes

Website visited 12th April 2011

Link Unavailable [http://sta.uwi.edu/cru/icgt-accessions.asp]; • Local Name: IMC 31
Venezuela, MAC Caucagua: List received in 1972 Reference

Reference

Perez, A.Z., Reyes, H.E. & Reyes, L.C. 1972
Programa de mejoramiento genetico de cacao en Venezuela. MAC, Caucagua, Venezuela, pp. 131.; • Local Name: IMC 31

DISEASE

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Ceratocystis: Resistant; Small, L.W., 1966

Reference

Small, L.W. 1966
Routine screening of clones for Ceratocystis. Cocoa Research Unit Annual Report on Cocoa Research 1966. The University of the West Indies, Trinidad, p.48.
Notes

Trinidad - CRU, University of the West Indies Datafile: DIS_CEDS - Disease reaction to Ceratocystis Descriptors: Resistance to C. fimbriata based on the test described in Delgado et al, 1965 [DEL65A] Environment: Inoculated specimens of split shoots incubated at controlled temperature and humidity. After 4 days incubation specimens were examined microscopically and perithecial and mycelial development scored. Regional Research Centre, Imperial College of Tropical Agriculture, University of the West Indies, Trinidad Germplasm: 50 genotypes of the Plant Breeder's selections from mainly River Estate, but with some material from St. Augustine fields and Las Hermanas.

Disease; Tolerant; Enriquez, G. & Soria, V.J., 1977

Reference

Enriquez, G. & Soria, V.J. 1977
Mejoramiento genético para resistencia a cinco enfermedades del cacao. In: Proceedings of the 6th International Cocoa Research Conference, Caracas, Venezuela, 1977. Cocoa Producers' Alliance, Lagos, Nigeria. pp. 45-56.
Notes

Various data sources Review of disease data complied at Costa Rica - CATIE from sources including: Costa Rica - CATIE, Trinidad - CRU, University of the West Indies, Ghana - WACRI, Ecuador - Pichilingue. Datafile: DIS_MODS - Disease reaction to Monilia Pod Rot DIS___DS - Disease reaction to stress and disease DIS_PHDS - Disease reaction to Phytophthora DIS_SSDS - Disease reaction to CSSV DIS_WBDS - Disease reaction to Witches' Broom DIS_CEDS - Disease reaction to Ceratocystis Descriptors: Information on the type of disease/stress and the reaction of the clone.

Disease
Phytophthora: Susceptible; Guiltinan, Mark, 2019

Reference

Guiltinan, Mark 2019
Theobroma cacao Disease Resistance: Discovery and Functional Characterization of Genes Regulating Plant Immunity in Perennial Crops. NCBI
Notes

A project to establish a new scientific approach for use with perennial crop plants to identify candidate loci for disease resistance using Theobroma cacao. Leaf samples were collected from the La Montaña field site at the CATIE field station in Turrialba, Costa Rica. The study focused on four genetic groups (Guiana, Iquitos, Marañon, and Nanay) and variation in resistance to Phytophthora.
Last updated: November, 2022

plantscience.psu.edu/…

Disease Population Accession Data Project Data; 19.08 % Infection (Pod).; Note: percentage of infected pods. Rank calculated using Newman-Keuls test at 5% = CD; Sounigo, O. et al., 1995

Reference

Sounigo, O., N'Goran, J., Coulibaly, N., Clement, D. & Lachenaud, P. 1995
Evaluation de clones de cacaoyers pour la productivite, la resistance aux mirides et la resistance a la pourriture des cabosses. In: Proceedings of the 11th International Cocoa Research Conference, Yammoussoukro, Cote d'Ivoire, 1993. Cocoa Producers' Alliance, Lagos, Nigeria. pp. 375-381.
Notes

Cote d'Ivoire - CIRAD/IDEFOR Datafile: CIV___DS CIV - CIRAD/IDEFOR Clone trial Germplasm: 67 clones were compared in five clonal trials. IFC 5 was used as a control in each of the trials. Environment: No details. Methods: Trial Loc'n Type Year Reps. Rep. Unit I17 Abengourou Fisher 1970 4 12 trees D11/2 Divo Fisher 1971 4 12 trees D13/4 Divo Fisher 1972 4 12 trees G8 Divo Fisher 1973 4 12 trees A18/2 Divo Random 1983 6 21 trees (Loc'n = location, Year = planting year, Reps = repetitions) Productivity assessed by counting the total number of pods and calculating the amount of saleable cocoa assuming each pod contains 40 g saleable cocoa. Analysis carried out on the following number of harvests: D11/2 - 1979/80 to 1981/92 3 harvests D13/4 - 1977/78 to 1981/82 5 harvests G8 - 1978/79 to 1981/82 4 harvests A18/2 - 1987/88 to 1991/92 5 harvests Sensitivity to pod rot was calculated as the ratio of rotten pods to healthy pods. Sensitivity to mirids was calculated on a scale of 0 to 4 according to the amount of die back caused by mirid damage since the year of planting.

Disease Pests Yield; Intermediate, sp. P. palmivora (Pod).; Clement, D. & Sounigo, O., 1992

Reference

Clement, D. & Sounigo, O. 1992
Ivory Coast Database. D. Clement & O. Sounigo, IRCC, Bingerville, Cote d'Ivoire. Personal Communication.
Notes

Cote d'Ivoire - IRCC/CNRA Bingerville Datafile: DIS_PHDS - Disease reaction to Phytophthora PROGENY_ Descriptors Tolerance to Phytophthora palmivora Environment: Tolerance evaluated from the percentage of rotten pods after natural infection Germplasm: 70 clones of different origins

Disease; Resistant, sp. P. palmivora (Pod).; Note: Fully grown, unripe detached pods (4-5 months old); A.D. Iwaro & D. R. Butler, 2003

Reference

A.D. Iwaro & D. R. Butler 2003
Sources of Resistance to Phytophthora Pod Rot at the International Cocoa Genebank, Trinidad. In: Proceedings of the 14th International Cocoa Research Conference, Accra, Ghana (October 2003). Cocoa Producers' Alliance, Lagos, Nigeria.
Disease

YIELD

Frances Bekele & Gillian Bidaisee, 2022: Pod Index: 23.1 (pods per kg dried beans); Reference

Reference

Frances Bekele & Gillian Bidaisee 2022
Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.
Notes

This single reference supercedes data entered previously and will be kept up-to-date to allow this information to be grouped together.

Yield Bean Butterfat Fruit Flush Flower
Sounigo, O. et al., 1995: Yield: 1749 kg ha^-1 yr^-1; Reference

Reference

Sounigo, O., N'Goran, J., Coulibaly, N., Clement, D. & Lachenaud, P. 1995
Evaluation de clones de cacaoyers pour la productivite, la resistance aux mirides et la resistance a la pourriture des cabosses. In: Proceedings of the 11th International Cocoa Research Conference, Yammoussoukro, Cote d'Ivoire, 1993. Cocoa Producers' Alliance, Lagos, Nigeria. pp. 375-381.
Notes

Cote d'Ivoire - CIRAD/IDEFOR Datafile: CIV___DS CIV - CIRAD/IDEFOR Clone trial Germplasm: 67 clones were compared in five clonal trials. IFC 5 was used as a control in each of the trials. Environment: No details. Methods: Trial Loc'n Type Year Reps. Rep. Unit I17 Abengourou Fisher 1970 4 12 trees D11/2 Divo Fisher 1971 4 12 trees D13/4 Divo Fisher 1972 4 12 trees G8 Divo Fisher 1973 4 12 trees A18/2 Divo Random 1983 6 21 trees (Loc'n = location, Year = planting year, Reps = repetitions) Productivity assessed by counting the total number of pods and calculating the amount of saleable cocoa assuming each pod contains 40 g saleable cocoa. Analysis carried out on the following number of harvests: D11/2 - 1979/80 to 1981/92 3 harvests D13/4 - 1977/78 to 1981/82 5 harvests G8 - 1978/79 to 1981/82 4 harvests A18/2 - 1987/88 to 1991/92 5 harvests Sensitivity to pod rot was calculated as the ratio of rotten pods to healthy pods. Sensitivity to mirids was calculated on a scale of 0 to 4 according to the amount of die back caused by mirid damage since the year of planting.

Disease Pests Yield

BEAN

Bartley, B.G.D., 1970: Size: medium; Reference

Reference

Bartley, B.G.D. 1970
A preliminary catalogue of the cacao germplasm held at the University of the West Indies, Trinidad. University of the West Indies, St. Augustine, Trinidad.
Notes

Trinidad - University of the West Indies Datafile: ICGT2_DS TTO - UWI Cacao Collection Germplasm: Passport descriptors for approximately 1000 accessions of mainly South American and Trinidadian origin. Environment: No details. Descriptors: Six descriptors for fruit, seed and compatability characteristics. Character Data: Combinations used FXC = forastero x criollo, TX = trinitario cross

Bean Fruit Flower
Frances Bekele & Gillian Bidaisee, 2022: Colour: purple; Shape: oblong; Number: 45.0; Total Wet Weight: 66.8 g; Cotyledon Dry Weight: 0.96 g; Cotyledon Length: 23.0 mm; Cotyledon Width: 13.1 mm; Reference

Reference

Frances Bekele & Gillian Bidaisee 2022
Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.
Notes

This single reference supercedes data entered previously and will be kept up-to-date to allow this information to be grouped together.

Yield Bean Butterfat Fruit Flush Flower

BUTTERFAT

Frances Bekele & Gillian Bidaisee, 2022: Testa: 8.80 %; Reference

Reference

Frances Bekele & Gillian Bidaisee 2022
Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.
Notes

This single reference supercedes data entered previously and will be kept up-to-date to allow this information to be grouped together.

Yield Bean Butterfat Fruit Flush Flower

FRUIT

Bartley, B.G.D., 1970: Size: large; Reference

Reference

Bartley, B.G.D. 1970
A preliminary catalogue of the cacao germplasm held at the University of the West Indies, Trinidad. University of the West Indies, St. Augustine, Trinidad.
Notes

Trinidad - University of the West Indies Datafile: ICGT2_DS TTO - UWI Cacao Collection Germplasm: Passport descriptors for approximately 1000 accessions of mainly South American and Trinidadian origin. Environment: No details. Descriptors: Six descriptors for fruit, seed and compatability characteristics. Character Data: Combinations used FXC = forastero x criollo, TX = trinitario cross

Bean Fruit Flower
Frances Bekele & Gillian Bidaisee, 2022: Shape: obovate; Basal Constriction: slight; Apex Form: obtuse; Rugosity: moderate; Length: 180.0 mm; Breadth: 84.0 mm; Colour: anthocyanin absent; Hardness: hard; Note: Hardness > 2.0 Mpa; Reference

Reference

Frances Bekele & Gillian Bidaisee 2022
Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.
Notes

This single reference supercedes data entered previously and will be kept up-to-date to allow this information to be grouped together.

Yield Bean Butterfat Fruit Flush Flower

PHENOTYPING

Fiona Lahive, 2017: Accession: RUQ 1449; Light Saturated Photosynthetic Rate: 4.06 μmol m² s^-1; Stomatal Conductance: 0.08 mol m² s^-1; Transpiration Rate: 0.97 mmol m² s^-1; Intrinsic Water Use Efficiency: 51.26 μmol mol^-1; Instantaneous Water Use Efficiency: 4.11 mmol mol^-1; Flush Size: 5; Leaf Area: 303.50 cm²; Leaf Dry Weight: 2.15 g; Specific Leaf Area: 142.10 cm² g^-1; Reference

Reference

Fiona Lahive 2017
Phenotypic data from climate change trials. Personal communication.
Notes

Data for single trees in ICQC,R. Each value is a mean of 2 time points with 6 leaves per tree (12 measurements), except flush size, which was 2 branches per tree (4 measurements).

Phenotyping

FLUSH

Allen, J.B., 1988: Colour: slight anthocyanin; Reference

Reference

Allen, J.B. 1988
Geographical variation and population biology in wild Theobroma cacao. PhD. Thesis, University of Edinburgh, U.K. pp. 197.
Notes

Colombia, Ecuador - Amazon region Datafile: LCT___DC ECU - LCTAP Fruit and seed characteristics LCT2__DS LCTAP Habit and flower characteristics LCT___DS ECU - LCTAP Field and genebank data Germplasm: Details of 234 LCT-EEN and EBC accessions from material collected in the Amazon region of Ecuador and R. Caqueta, Colombia and several of Pound's collections held at the San Carlos genebank. Environment: Accessions were either described at the time of collection or after planting in the field genebank at the San Carlos site of the INIAP Napo-Payamino Experimental Station in Napo Province. In the field genebank, a maximum of 10 seedlings for each collection were planted in a single row and budwood collections were planted as a row of up to 5 plants. Trees were spaced at 3m within the row and 4m between rows. Meteorological data are given in the table as mean daily maximum and mean daily minimum temperature and mean total rainfall per month. Soil analyses were carried out in the Department of Forestry and Natural Resources, Edinburgh University, UK. The table shows the means of duplicate analyses of five samples taken from the genebank site and the forest surrounding the genebank. Soil data: pH 4.2 Org. Mat. (%) 9.4 N (Total, %) 0.3 P (Total, µg/g) 702 Ca (meq/100g) 5.19 Mg (meq/100g) 1.60 K (meq/100g) 0.48 Ca/Mg (ratio) 3.24 Ca+Mg/K (ratio) 14.1 Meteorological data: Temperature (°C) Rainfall (mm) Daily Max. Daily Min. January 30.9 21.2 116.2 February 29.1 20.6 272.3 March 29.8 21.2 260.0 April 29.9 21.3 327.5 May 29.9 21.0 287.9 June 27.9 20.4 308.1 July 28.1 20.0 254.1 August 29.3 20.3 262.5 September 30.3 20.5 282.4 October 30.6 21.1 257.1 November 30.8 21.1 361.2 December 31.0 21.4 154.8 Descriptors: The coding of the descriptors, and the methodology of recording, is based on the IBPGR standardised format, Engels et al., 1980 [ENG80A] and Engels, 1981 [ENG81A]. However, pod and bean data were recorded from a sample of 1-5 pods per collection, rather than the recommended sample of 10-20 pods due to limited availability of pods.

Flush Flower
Frances Bekele & Gillian Bidaisee, 2022: Colour: moderate anthocyanin; Reference

Reference

Frances Bekele & Gillian Bidaisee 2022
Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.
Notes

This single reference supercedes data entered previously and will be kept up-to-date to allow this information to be grouped together.

Yield Bean Butterfat Fruit Flush Flower

LEAF

Trinidad - ICGT, 1992: Distance from Base to Widest Part: 115 mm; Length: 234.0 mm; Width: 86.0 mm; Length to Width Ratio: 2.70; Basal Angle: 92.2 °; Apical Angle: 75.3 °; Petiole Length: 21 mm; Pulvinus Length: 10 mm; Reference

Reference

Trinidad - ICGT 1992
Leaf descriptors. Unpublished data supplied on computer diskette by International Cocoa Genebank, Trinidad, University of the West Indies, Trinidad.
Notes

Trinidad - International Cocoa Genebank, CRU, University of the West Indies.
Flower descriptor data is presented for 620 clones, fruit descriptor data of 333 and seed characters of 118 clones are partly described. Leaf descriptor data is presented for 229 clones. The germplasm is mainly of Peruvian, Ecuadorian and Colombian origin. Environment: Each clone is represented in the collection by up to 16 trees planted 1.8 m apart in a block design. Shading is provided by Erythrina sp. (spaced 60m apart) and bananas (spaced 4m apart). Fertilizer, N-P-K (15:10:5), is provided twice a year at 250g per tree. Cyclic irrigation is performed from February to May (10 l of water per plant/week). Soil type group -33 A 1 Soil Series - Cunupia fine sandy clay with restricted internal drainage Lithology - silty clay alluvium Drainage - imperfect Slope category - 0°-2° Meterological data are given in this table as mean maximum, mean minimum and overall mean temperature and mean total rainfall per month over the period 1961-1990. Month Temp. (°C) Rainfall Max Min Mean (mm) January 30.1 20.8 24.6 71.2 February 30.2 20.8 25.0 43.3 March 31.2 21.4 25.7 36.6 April 31.8 22.3 26.5 51.1 May 31.6 23.3 26.9 116.5 June 30.6 23.3 26.4 252.1 July 30.8 23.0 26.2 266.3 August 31.2 22.9 26.4 250.1 September 31.5 22.8 26.5 202.5 October 31.4 22.82 6.41 99.3 November 30.8 22.4 25.9 227.8 December 30.2 21.5 25.2 155.6 Descriptors: The character selection is based on the IBPGR list (IBPGR, 1981 [IBP81A]). Where descriptor states present real measurements, e.g. pod length in cm, the data are given as the mean of all the measurements ± the standard deviation. For some descriptors, such as Leaf, flush colour, the phenotypic expression of the character is coded on a scale from 0 to 9. On this scale '0' represents the lowest or weakest expression of a characteristic and '9' represents the highest or strongest. Leaf and Flower Characteristics p.300-307

Leaf

FLOWER

Allen, J.B., 1988: Stamen Colour: slight anthocyanin; Sepal Colour: slight anthocyanin; Sepal Length: 7.50 mm; Ovary Colour: anthocyanin absent (apical); Pedicel Colour: moderate anthocyanin; Reference

Reference

Allen, J.B. 1988
Geographical variation and population biology in wild Theobroma cacao. PhD. Thesis, University of Edinburgh, U.K. pp. 197.
Notes

Colombia, Ecuador - Amazon region Datafile: LCT___DC ECU - LCTAP Fruit and seed characteristics LCT2__DS LCTAP Habit and flower characteristics LCT___DS ECU - LCTAP Field and genebank data Germplasm: Details of 234 LCT-EEN and EBC accessions from material collected in the Amazon region of Ecuador and R. Caqueta, Colombia and several of Pound's collections held at the San Carlos genebank. Environment: Accessions were either described at the time of collection or after planting in the field genebank at the San Carlos site of the INIAP Napo-Payamino Experimental Station in Napo Province. In the field genebank, a maximum of 10 seedlings for each collection were planted in a single row and budwood collections were planted as a row of up to 5 plants. Trees were spaced at 3m within the row and 4m between rows. Meteorological data are given in the table as mean daily maximum and mean daily minimum temperature and mean total rainfall per month. Soil analyses were carried out in the Department of Forestry and Natural Resources, Edinburgh University, UK. The table shows the means of duplicate analyses of five samples taken from the genebank site and the forest surrounding the genebank. Soil data: pH 4.2 Org. Mat. (%) 9.4 N (Total, %) 0.3 P (Total, µg/g) 702 Ca (meq/100g) 5.19 Mg (meq/100g) 1.60 K (meq/100g) 0.48 Ca/Mg (ratio) 3.24 Ca+Mg/K (ratio) 14.1 Meteorological data: Temperature (°C) Rainfall (mm) Daily Max. Daily Min. January 30.9 21.2 116.2 February 29.1 20.6 272.3 March 29.8 21.2 260.0 April 29.9 21.3 327.5 May 29.9 21.0 287.9 June 27.9 20.4 308.1 July 28.1 20.0 254.1 August 29.3 20.3 262.5 September 30.3 20.5 282.4 October 30.6 21.1 257.1 November 30.8 21.1 361.2 December 31.0 21.4 154.8 Descriptors: The coding of the descriptors, and the methodology of recording, is based on the IBPGR standardised format, Engels et al., 1980 [ENG80A] and Engels, 1981 [ENG81A]. However, pod and bean data were recorded from a sample of 1-5 pods per collection, rather than the recommended sample of 10-20 pods due to limited availability of pods.

Flush Flower
Frances Bekele & Gillian Bidaisee, 2022: Ligule Colour: moderate anthocyanin; Stamen Colour: moderate anthocyanin; Sepal Length: 7.26 mm; Ligule Width: 2.55 mm; Ovule Number: 52; Style Length: 2.11 mm; Pedicel Colour: red; Reference

Reference

Frances Bekele & Gillian Bidaisee 2022
Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.
Notes

This single reference supercedes data entered previously and will be kept up-to-date to allow this information to be grouped together.

Yield Bean Butterfat Fruit Flush Flower

REFERENCES

Pound, F.J. (1938) Cacao and Witchbroom Disease of South America with notes on other species of Theobroma. Archives of Cocoa Research 1: pp. 26-71.

Motamayor, J.C., Lachenaud, P., da Silva e Mota, J.W., Loor, R., Kuhn, D.N., Brown, J.S. & Schnell, R.J. (2008) Geographic and Genetic Population Differentiation of the Amazonian Chocolate Tree (Theobroma cacao L). PLoS ONE 3(10): e3311. doi:10.1371/journal.pone.0003311

Guiltinan, Mark (2019) Theobroma cacao Disease Resistance: Discovery and Functional Characterization of Genes Regulating Plant Immunity in Perennial Crops. NCBI

Allan Mata (2018) Accession list for the International Cacao Collection at CATIE (IC3). Personal communication.

Cote d'Ivoire - IRCC (1989) Liste des clones en collection. Unpublished Report, IRCC Bingerville, Cote d'Ivoire, Doc. No. 192. D. Clement, IRCC, Cote d'Ivoire. Personal Communication.

EET - Pichilingue (2012) Accessions planted in EET - Pichilingue, Ecuador. Freddy Amores and Ignacio Sotomayor C, personal communication, February 2012.

Malaysia - ARC Tuaran (1990) List of clones held in the Dept. of Agriculture's collection, at Sabah, Tuaran, Malaysia. E.B. Tay, Malaysian Cocoa Board, Malaysia. Personal Communication.

CRU (2011) ICG,T accessions. CRU website.

Perez, A.Z., Reyes, H.E. & Reyes, L.C. (1972) Programa de mejoramiento genetico de cacao en Venezuela. MAC, Caucagua, Venezuela, pp. 131.

Small, L.W. (1966) Routine screening of clones for Ceratocystis. Cocoa Research Unit Annual Report on Cocoa Research 1966. The University of the West Indies, Trinidad, p.48.

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Frances Bekele & Gillian Bidaisee (2022) Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.

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