Journal ID : AMA-08-02-2023-12001
[This article belongs to Volume - 54, Issue - 02]
Total View : 390

Title : Fertility Alteration and Gene Action Analysis for Yield Characteristics in Two-Line System Hybrid Rice (Oryza sativa L)

Abstract :

Combining ability and gene action of the main agronomic and yield traits in Egyptian PTGMS (females) and Egyptian Japonica (EJGSR) and Indica Japonica Green Super Rice (EIJGSR) lines (male testers) were studied. The combining ability, gene action, and genetic parameters of ten main traits were analyzed by Line x Tester using five PTGMS lines and six male testers. The altered fertility of the tested lines was investigated at different periods. All traits are mainly controlled by the general combining ability of the parents. For all traits except spikelets panicle-1, the mean square value difference of the L x T (SCA) of the tested combinations was extremely significant. The estimated values of variance due to GCA were higher than that due to SCA for all agronomic and yield traits and its components. The expected value of GCA for male testers K2g (M) was higher than female PTGMS lines K2g (F) for all traits. The ratio of K2gca/K2sca was more than unity for all traits indicated the additive gene action is playing big role in the inheritance of these traits. EPTGMS 85 was the best combiner of female lines for grain yield. The testers, EIJGSR (F) 73, EIJGSR (F) 62 and Sakha Super 301, were the best general combiners among testers for grain yield and most of studied traits. Seven super hybrid rice combinations were the best, giving significantly positive (desirable) estimates of the SCA effect on grain yield (t ha-1). The highest estimates were obtained for EPTGMS85/Sakha super 300), EPTGMS20/EJGSR179 and EPTGMS34/Sakha super 300.

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