Laboratory screening of cocoa genotypes for drought tolerance
In this paper, results of screening of cocoa germplasm for drought tolerance/resistance using three tests are presented. The parameters used are heat stability of chlorophyll (CSI), proline accumulation ability and germination of seeds under low osmotic potential. The CSI is found to vary considerable among the cocoa genotypes. The highest CSI is in Criollo and the lowest in NC 34. In general the 'P' combinations are found to be more stable to heat degradation. Proline accumulation also is found to vary considerable among the cocoa genotypes investigated. The maximum proline accumulation is in NC 34 and the minimum in Criollo. Here also the 'P' combinations were found to accumulate more proline than the others. In the study of germination under low osmotic pressure conditions also, NC 34 fared much better than all the other types. The results indicate that certain genotypes are more tolerant to heat degradation of chlorophyll, accumulates more proline under induced stress and give higher germination percentage under low OP. Such types can be selected for further testing for field performance.
| Main Authors: | , |
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| Format: | biblioteca |
| Published: |
1982
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| Subjects: | THEOBROMA CACAO, GENOTIPOS, RESISTENCIA A LA SEQUIA, PRESION OSMOTICA, CLOROFILAS, PROLINA, INDIA, |
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