Development of Hybrids with Promising Restorers under Test Cross Nursery Study in Rice (Oryza Sativa L.)

Abstract

The experiment was carried out during Rabi, 2018-19 and thirty-four rice stable lines crossed with five (5) wild abortive cytoplasmic male sterile (CMS) line to develop 170 F1s. Those 170 F1s were evaluated in test cross nursery evaluation (TCN) during Kharif, 2019 along with two locally popular checks Jagtiala Rice-1 (JGL 24423) and Bathukamma (JGL 18047). Among those 170 F1s, 32 restorer cross combinations, 23 maintainer cross combinations and remaining 114 partial cross combinations (partial restorers or partial maintainers) were identified based on pollen fertility (%) and spikelet fertility (%). In restorer cross combinations, four stable lines viz., JGL 36147, JGL 37228, JGL 36181 and JGL 37207 having spikelet fertility %, Pollen fertility% (90.5%,89.7%), (90.5%, 93%), (95%, 85%) and (90.6%, 89%) recorded respectively. In maintainer cross combinations, three stable lines JGL 36181, VT-101 and VT-106 recorded 0 to 1 % spikelet and pollen fertility percentage. Among the 32 restorer cross combinations, best 14 cross combinations (based on yield and its attributing characters) were promoted to preliminary yield trial (PHT) and evaluated in Kharif, 2020. Among the 14 hybrids, two hybrids namely, JGLH 447 (5.9 t/ha, 16.5%) and JGLH 442 (5.3 t/ha, 14.6%) recorded significant higher yields and low percent of gall midge incidence over locally cultivated cultivars, JGL 24423 (4.4 t/ha, 16.8%), US 312 (4.3 t/ha, 36.2%), 27P31 (4.2 t/ha, 35.6%) and HRI 174 (3.2 t/ha, 37.1%).