Screening of some rice genotypes for aerobic condition in Northeast India

Abstract

In an experiment conducted during 2015-2016, about 150 rice genotypes from different ecotypes were collected and screened for drought response. Out of 150 genotypes, some genotypes showed tolerance under drought condition. The genotypes were grouped into three numbers viz. highly tolerant (HT, survive 25-37 DAS), medium tolerant (MT, 20-24 DAS), susceptible (ST, 10-19 DAS) based on germination, survival and growth from days of sowing. After screening, five genotypes viz. Banglami, Inglongkiri, Boga ahu, Ronga ahu, and Bengungutia ahu were selected and evaluated to understand the mechanism of tolerance under aerobic and normal condition by comparing with aerobic rice variety CR Dhan. Some genotypes viz. Ronga ahu, Inglongkiri and Banglami recorded higher seedling vigour index (SVI), therefore seed of those genotypes easily survived for even 30-35 days under aerobic condition. Thus identification of long-coleoptile trait in rice may improve seedling establishment and yield stability of the rice under aerobic condition in farmers’ field. Such genotypes may be used for future breeding material for moisture stress condition.