Analysis of diallel cross for some physical-quality traits in peanut (Arachis hypogaea L.) |
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| Authors: | K Hariprasanna Chuni Lal T Radhakrishnan H K Gor B M Chikani |
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| Institution: | (1) National Research Centre for Groundnut, P.O. Box No. 5, Junagadh, Gujarat, 362 001, India |
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| Abstract: | The combining abilities for physical-quality traits in peanut were examined to understand the type of gene action governing
these traits, and to identify peanut genotypes suitable for use as parents in breeding for quality improvement. The F1 hybrids including reciprocals from a six-parent diallel cross along with the parents were evaluated in a randomised complete
block design. Data were recorded on five quality traits in peanut viz., shelling outturn, 100-pod weight, 100-seed weight, Count and proportion of sound mature seeds. Substantial genetic variability
was observed among the hybrids for the traits studied. Diallel analysis indicated that expression of majority of the quality
traits is regulated predominantly by additive gene action suggesting possibility of early-generation selection, while non-additive
gene action also plays an equally important role in the control of seed size. Significant reciprocal effect for all the traits
denoted role of maternal parent in the expression of quality traits and importance of parental selection in quality breeding.
Genotypes ICGV 86564 and TPG 41 were good combiners for seed size, while J 11 was a good combiner for improvement of shelling
outturn and proportion of mature seeds. Association between general combining ability (GCA) effects and mean performance suggested
that the performance per se of the genotype should be a good indicator of its ability to transmit the desirable quality attributes
to its progenies. Though performance of crosses was found to be independent of parental GCA status, it is evident that at
least one of the parents used in hybridisation should have large pods and seeds for obtaining better segregants. |
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| Keywords: | Arachis hypogaea Combining ability Diallel analysis Quality traits |
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