PJB-2019-608
Inheritance Pattern of Yield Contributing Traits in Basmati Rice
Muhammad Rashid
Abstract
Five diverse rice genotypes including one tall statured, one dwarf, three medium tall along with one possessing extra long grain were crossed in a full diallel mating design. The P1, P2, F1 and reciprocal crosses were arranged in a complimentary random block design with three replications. Preliminary ANOVA showed significant differences for all the traits. Additive-dominance model was employed for the interpretation of inheritance pattern for yield and yield components in rice. Additive-dominance model was fully adequate for plant height, spikelets/panicle and partially adequate for fertility%, 1000-grain weight and yield/plant. Additive component (D) and dominance components (H1&H2) were found significant for all the traits, confirming the contribution of both additive and non-additive effects in the inheritance of the traits. Formal ANOVA results revealed the contribution of both additive ‘a’ and non additive effects ‘b’ for all the traits. Inheritance in case of plant height and spikelets/pancile was controlled by additive genes with partial dominance; whereas gene action for fertility% and yield/plant exhibited over dominance in nature. Heritability estimates were high for plant height and spikelets/panicle and low for fertility% and yield/plant. Hybrid vigor can be exploited in the case of fertility% and yield/plant while in cases of plant height and spikelet’s/panicle pedigree selection might be fruitful for improvement of the rice crop.
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