Genotype x Environment Interactions for Heat Tolerance of Rice Under Different High Temperature Location

The recent trends in climate changes envision greater environmental challenges to be imposed on crops in near future. In an effort to improve our knowledge in the impact of high temperature on rice growth and reproduction, a set of recombinant inbred lines (RILS) derived from Dasan(indica)/TR22183(japonica) were cultivated and the genotype × environment interactions (GEI) for heat tolerance was evaluated. The inbred lines were grown under three different climates, temperate (Suwon), subtropical (Shanghai) and tropical (IRRI) zones. Eight agronomic traits were evaluated and the additive main effects and multiplicative interaction (AMMI) statistical model was applied to dissect the G × E interactions. In the biplots based on the first two IPCAs in SF, the RILs were located near the centers of IPCA1 axe. The environments parameter were found to be particularly dispersed in Shanghai 2010 and a high IPCA value was observed in IRRI dry season 2011. Although grain yield showed similar pattern among these plant groups, based on the spikelet fertility and grain yield the environments could be divided into three groups. The results showed that in Shanghai 2010 and dry season in IRRI materials were damaged the most, indicating that the two regions had suffered from high temperature stress during anthesis. It seems implying that heat tolerance during anthesis was more sensitive to G×E in dry season IRRI and Shanghai2010 than other conditions. Multi-locational screening can be a good strategy for developing heat tolerant varieties in rice.

*Corresponding author: Tel. 82) 02-880-4551, E-mail: heejkoh@snu.ac.kr