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Assessment of morphological, physiological and molecular characteristics of cocoa accessions from Central and South America in relation to drought tolerance

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Title Assessment of morphological, physiological and molecular characteristics of cocoa accessions from Central and South America in relation to drought tolerance
Not Available
 
Creator S. Elain Apshara
M.K. Rajesh
D. Balasimha
 
Subject Cocoa
drought tolerance
physiology
diversity
 
Description Not Available
Eleven cocoa accessions, representing collections from five central and south American countries, were assessed for their morphological, molecular and physiological parameters. Growth characters were observed in three year old plants and initial pod yields were recorded. Photosynthesis, related parameters and chlorophyll indices, measured during two seasons, showed significant differences between non-stress and stress periods as well as among the genotypes. The transpirational water loss was reduced with increased stomatal closure, which is a favourable drought trait in crops. The results indicated that the genotypes showing higher water potential and Fv/Fm ratio can be considered as drought tolerant. The rank sums of these parameters showed that genotypes JA-1/19, POU-16/A and SC-4 were the most droughttolerant. Microsatellite markers were used to assess the extent of genetic diversity between clones. The amplification of DNA from the 11 accessions using the 15 microsatellite loci revealed a total of 80 consistent and scorable alleles with an average of 5.33 alleles per locus and all the loci were 100 per cent polymorphic, the most polymorphic locus being mTcCIR33 with 8 alleles. The observed heterozygosity ranged from 0.36 to 0.63 with an average of 0.52. The inbreeding
co-efficient (f) ranged from -0.22 (mTcCIR8) to 0.58 (mTcCIR40) with an average of 0.32. The microsatellite marker analysis revealed that the genotypes possess a wide genetic diversity. The drought tolerant types identified in this study viz., JA-1/19, POU-16/A and SC-4 could be used for cultivation in areas with moisture deficient stress and in selective cocoa breeding programs for drought tolerance.
Not Available
 
Date 2019-10-30T06:56:52Z
2019-10-30T06:56:52Z
2013-09-01
 
Type Article
 
Identifier Journal of Plantation Crops, 2013, 41(3): 389-397
2454-8480
http://krishi.icar.gov.in/jspui/handle/123456789/24197
 
Language English
 
Relation Not Available;
 
Publisher Indian Society of Plantation Crops