Back to Contents

FREE FULL TEXT PDF

GENETIC BASIS OF YIELD AND SOME YIELD RELATED TRAITS IN BASMATI RICE

MUHAMMAD YUSSOUF SALEEM^1*, JAVED IQBAL MIRZA² AND MUHAMMAD AHSANUL HAQ¹

Abstract: Additive, dominance and epistasis components of genetic variation for yield and some yield related traits were assessed through modified triple test cross technique in Basmati rice. Epistasis was found an important part of genetic variation for plant height, tillers per plant, secondary branches per panicle, grains per panicle, 1000-grain weight and yield per plant except primary branches per panicle and panicle length.  Bifurcation of epistasis showed that additive x additive (i) type and additive x dominance + dominance x dominance (j + l) types of non-allelic interactions were involved in the expression of these traits. Additive and dominance type of gene action influenced the expression of primary branches per panicle and panicle length. No evidence of directional dominance was observed for these two traits. For plant height, tillers per plant, secondary branches per panicle, grains per panicle, 1000-grain weight and yield per plant, recurrent selection or biparental mating may be exercised in F₂ and following generations however, selection of desired plants may be postponed till F₅ or F₆ generations to permit maximum obsession of epistatic effects to develop desired cultivar(s) in Basmati rice.

¹Nuclear Institute for Agriculture and Biology (NIAB), P. O. Box 128, Faisalabad, Pakistan

²Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan, Pakistan