Citation
R. Haya, . and Navies M., . and Kelvin L., . and Albert L.S.C., . and A. Alias, . and Nuraziawati M.Y., . (2007) Screening for cocoa pod borer resistance based morphological descriptors. [Proceedings Paper]
Abstract
Morphological traits of the cocoa clones were assessed as possible parameter in screening for resistance to Cocoa Pod Borer. One hundred and fifty nine 159 cocoa clones were screened for their morphological traits at the Malaysian Cocoa Board Research and Development Centre. One of the pod morphological characteristics assessed was sclerotic layer SCL hardness determined using SP02 penetrometer. SCL hardness was measured on five pods from each clone at 15 points per pod with five measurements at primary furrow PF secondary furrow SF and ridges R respectively. SCL hardness was measured in units of kg cm-2. The ANOVA showed significant differences P less than 0.01 in SCL hardness among the clones screened. The SCL hardness was between 51.49 to 183.03 kg cm-2. The cluster analysis using Unweighted Pair Group Method with Arithmetic mean UPGMA grouped the clones into six clusters according to their SCL hardness. Clones CC39 ICS9 EET 353 ACT2/18 ICS I APA4 IMC55 Larange SIC 1 and SIAL325 are the hardest clones whereas EET391 K39 EET308 CC54 CC71 CC 10 ICS 16 and IMC45 are the softest clones. The relationship between SCL hardness SCL thickness husk thickness and pod surface roughness index were also discussed.
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Abstract
Morphological traits of the cocoa clones were assessed as possible parameter in screening for resistance to Cocoa Pod Borer. One hundred and fifty nine 159 cocoa clones were screened for their morphological traits at the Malaysian Cocoa Board Research and Development Centre. One of the pod morphological characteristics assessed was sclerotic layer SCL hardness determined using SP02 penetrometer. SCL hardness was measured on five pods from each clone at 15 points per pod with five measurements at primary furrow PF secondary furrow SF and ridges R respectively. SCL hardness was measured in units of kg cm-2. The ANOVA showed significant differences P less than 0.01 in SCL hardness among the clones screened. The SCL hardness was between 51.49 to 183.03 kg cm-2. The cluster analysis using Unweighted Pair Group Method with Arithmetic mean UPGMA grouped the clones into six clusters according to their SCL hardness. Clones CC39 ICS9 EET 353 ACT2/18 ICS I APA4 IMC55 Larange SIC 1 and SIAL325 are the hardest clones whereas EET391 K39 EET308 CC54 CC71 CC 10 ICS 16 and IMC45 are the softest clones. The relationship between SCL hardness SCL thickness husk thickness and pod surface roughness index were also discussed.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| AGROVOC Term: | THEOBROMA CACAO |
| AGROVOC Term: | CLONES |
| AGROVOC Term: | FRUIT |
| AGROVOC Term: | CONOPOMORPHA CRAMERELLA |
| AGROVOC Term: | MORPHOLOGY |
| AGROVOC Term: | MEASUREMENT |
| AGROVOC Term: | STATISTICAL METHODS |
| AGROVOC Term: | FIRMNESS |
| AGROVOC Term: | THICKNESS |
| AGROVOC Term: | MALAYSIA |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:27 |
| URI: | http://webagris.upm.edu.my/id/eprint/15706 |
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