Half SIB analysis for physiological traits in cocoa
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Date
2007-02
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Abstract
Cocoa (Theobroma cacao L.) plants are sensitive to drqught and hence expansion of cultivation has been hampered due to dry spells of 3-6 months in Southern India. Efforts made to identify drought tolerance characteristics among the cocoa accessions have resulted in identification of five tolerant lines. Four high yielding trees viz., 1-14 (Red axil), 1-21,1-29 (Amel x Na33) and II-67 (Landas 364) were selected as female parents and crossed with drought tolerant pollen parent viz., NC 42/94 (T86/2). The F1 hybrid seedlings were planted in the field for evaluation. Field measurements on physiological parameters were made during stress and non - stress conditions. Twenty two physiological parameters were studied in four cocoa hybrids, namely, 1-14 x NC42/94,1-21 x NC 42/94,1-29 x NC 42/94 and II-67 x NC 42/94. The parameters were analyzed under non - stress and stress conditions. The characters that showed high heritability and genetic advance under stress were sugar, potasium, leaf temperature, internal C02, water potential, lipid peroxidation, superoxide dismutase, polyphenol oxidase and acid phosphatase. The heritabilities and genetic advance of the hybrids under non-stress were high for total chlorophyll, peroxidase, polyphenol oxidase and acid phosphatase indicating that the nature of gene action varies under the control of environment. Genotypic and phenotypic correlations among the traits were also studied.
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Plantation crops research and development in the new Millennium 2002 p-138-143