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LX 31    Theobroma cacao

 Pound, F.J. (1943)
First report on the selection of cacao trees for resistance to Witches' Broom disease. Unpublished report, Ministry of Agriculture, Trinidad.

Derivation: Large vuelta X.
Collected by Pound.
Location: Limoncillo, Ecuador.

Notes:  Seedlings from selected trees, established at Marper farm, Trinidad.

10/09/96 Previously recorded in the ICGD and elsewhere that LX stood for Limoncillo. However, Pound 1943b [POU43B] indicates that it stands for Large Vuelta X.


 

 HELD IN

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Current List   ICQC,R Website
• Accession: RUQ 1591     ICQC,R 
   - Local Name: LX 31
   - Year of Accession: 2006
List received in 2012   Reference
• Accession: 1240
   - Local Name: LX 31
List received in 2012   Reference
• Local Name: LX-31/T2
List received in 2018   Reference
• Accession: 22189
   - Local Name: LX-31
   - Year of Accession: 2012
List received in 2011   Reference
• Local Name: LX 31

 DISEASE

 Phytophthora
Resistant, sp. P. palmivora (Pod).
Note: Fully grown, unripe detached pods (4-5 months old)
 A.D. Iwaro & D. R. Butler, 2003
Resistant, sp. P. palmivora (Pod).
Note: Score: 2 (1-8 Scale). Fully grown, unripe detached pods (4-5 months old).
 A.D. Iwaro et al., 2006

 YIELD

 Frances Bekele & Gillian Bidaisee, 2022
Pod Index: 26.5 (pods per kg dried beans)
 Reference

 BEAN

 Frances Bekele & Gillian Bidaisee, 2022
Colour: purple
Shape: elliptical
Number: 42.0
Total Wet Weight: 62.5 g
Cotyledon Dry Weight: 0.90 g
Cotyledon Length: 21.3 mm
Cotyledon Width: 12.2 mm
 Reference

 BUTTERFAT

 Frances Bekele & Gillian Bidaisee, 2022
Testa: 5.80 %
 Reference

 FRUIT

 Frances Bekele & Gillian Bidaisee, 2022
Shape: elliptical
Basal Constriction: slight
Apex Form: obtuse
Rugosity: moderate
Length: 155.0 mm
Breadth: 79.0 mm
Colour: anthocyanin absent
Hardness: hard
Note: Hardness > 2.0 Mpa
 Reference

 PHENOTYPING

 Fiona Lahive, 2017
Accession: RUQ 1591
Light Saturated Photosynthetic Rate: 3.41 μmol m2 s-1
Stomatal Conductance: 0.07 mol m2 s-1
Transpiration Rate: 1.06 mmol m2 s-1
Intrinsic Water Use Efficiency: 51.31 μmol mol-1
Instantaneous Water Use Efficiency: 3.35 mmol mol-1
Flush Size: 5
Leaf Area: 289.50 cm2
Leaf Dry Weight: 1.99 g
Specific Leaf Area: 146.90 cm2 g-1
 Reference

 FLUSH

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

 FLOWER

 Frances Bekele & Gillian Bidaisee, 2022
Ligule Colour: moderate anthocyanin
Stamen Colour: slight anthocyanin
Sepal Length: 6.67 mm
Ligule Width: 1.97 mm
Ovule Number: 46
Style Length: 1.95 mm
Pedicel Colour: red
 Reference

Pound, F.J. (1943) First report on the selection of cacao trees for resistance to Witches' Broom disease. Unpublished report, Ministry of Agriculture, Trinidad.
CEPEC (2012) Accession list for the CEPEC (Bahia, Brazil) collection. Dr. José Luis Pires, personal communication, February 2012.
Mars Center for Cocoa Science (2012) Accession list for the Mars Center for Cocoa Science. Jean-Philippe Marelli, personal communication, February 2012.
Allan Mata (2018) Accession list for the International Cacao Collection at CATIE (IC3). Personal communication.
CRU (2011) ICG,T accessions. CRU website.
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.
A.D. Iwaro, D.R. Butler & A.B. Eskes (2006) Sources of resistance to Phytophthora pod rot at the International Cocoa Genebank, Trinidad. Genetic Resources and Crop Evolution (2006) 53: 99–109
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.
Fiona Lahive (2017) Phenotypic data from climate change trials. Personal communication.