Vol. 10, Issue 2 (2021)

Author(s):
Surender R, Lavanya K, Abdul Fiyaz, Chiranjeevi M, Shiva Prasad G and LV Subba Rao

Abstract:
Rice (O. sativa L.) is sensitive to high temperatures, especially at the time of reproductive stage.Screening of wide range of germplasm against to high temperature conditions in field level is reliable and superior to all the screening procedures to identify suitable genetic donors to develop climate resilient genotypes. The experimental material showed a wide range of variation in spikelet fertility from 98.6% to 16.3% due to climatic conditions. 65entries identified as genetic donors based on spikelet fertility, which recorded more than 90% fertility. Among them, Acc no 2012-130(98.8, 48.6), EC 448(98, 30), 2012-133 (98, 35.9), 2012-149(97, 44) and 2012-129(95.5, 55.6) noted highest fertility percentage and Single plant yield respectively. The daily temperature is typically higher during the spikelet flowering period for japonica rice, resulting in severe spikelet sterility, which suggests that early flowering cultivar type could reduce the high temperature damage.EC series (exotic collection) from Africa accessions are flowering and anthesis in the early morning due to early nature it escapes from the heat stress.