Vol. 11, Issue 2 (2022)

Author(s):
Praveen Kumar, Debojit Sarma, Monalisha Devi, Mainu Hazarika, Deshraj Gujar and Prashant Koishik

Abstract:
In the present investigation conducted at Assam Agricultural University, Jorhat, Assam, studied 11 genotypes selected out of 60 genotypes on the basis of genetic divergence including landraces, maintainers of wild abortive cytoplasmic male sterile (WA CMS) lines and high yielding varieties (HYVs) and study were done for the 19 traits of ahu/aus rice of Assam. The estimates of heterosis for seedling establishment, days to 50% flowering, panicle initiation, days to maturity, culm length, panicle length, biological yield per plant, and straw yield per plant and gel consistency were mostly negative. The crosses with negative heterosis effects indicated the reduction in performance of the concerned trait but seedling height, flag leaf area, productive tillers, average panicle weight. panicle length, grains per panicle spikelet fertility grains yield per plant for biological yield per plant and harvest index showed positive and significant positive mid- and better parent Heterosis for most of crosses. Twenty-seven crosses exhibited significant positive heterosis for straw yield. The crosses, BOR*25B (18.35**), LAL*55B (29.34**), SUR*LAC (29.05**) and MAY*LAC (26.59**) showed significant positive mid-parent heterosis for grains yield per plant and better parent heterosis for grain yield per plant ranged from -10.38** (LAL*BOR) to 29.20** (88B*LUI). The crosses, namely 88B*LUI (29.20**), SUR*LAC (27.11**), 88B*55B (25.48**) and MAY*LAC (25.42**), exhibited significant positive better-parent heterosis for grains yield per plant.