Abstract
Recent predictions on climate change indicate that high temperature episodes are expected to impact rice production and productivity worldwide. The present investigation was undertaken to assess the yield stability of 72 rice hybrids and their parental lines across three temperature regimes over two consecutive dry seasons using the additive main effect and multiplicative interaction (AMMI), genotype and genotype × environment interaction (GGE) stability model analysis. The combined ANOVA revealed that genotype × environment interaction (GEI) were significant due to the linear component for most of the traits studied. The AMMI and GGE biplot explained 57.2% and 69% of the observed genotypic variation for grain yield, respectively. Spikelet fertility was the most affected yield contributing trait and in contrast, plant height and tiller numbers were the least affected traits. In case of spikelet fertility, grain yield and other yield contributing traits, male parent contributed towards heat tolerance of the hybrids compared to the female parent. The parental lines G74 (IR58025B), G83 (IR40750R), G85 (C20R) and hybrids [G21 (IR58025A × KMR3); G3 (APMS6A × KMR3); G57 (IR68897A × KMR3) and G41 (IR79156A × RPHR1005)] were the most stable across the environments for grain yield. They can be considered as potential genotypes for cultivation under high temperature stress after evaluating under multi location trials.
Highlights
Recent predictions on climate change indicate that high temperature episodes are expected to impact rice production and productivity worldwide
A total of 103 test entries were evaluated and wide range of variation was recorded for all the traits namely, grain yield per plot (4506.86– 9918.81 kg/ha), panicle weight (1.81–3.41 g), 1000 seed weight (15.33–21.11 g), single plant yield (14.4–30.87 g), spikelet fertility (75.04–90.61%), grains per panicle (107.78–225.71), panicle length (20.52–23.75 cm), number of productive tillers (9–13), plant height (77.66–112.77 cm) (Table 1)
G65 (IR68897A × IR-66R) was found significantly better in terms of single plant yield and grain yield compared to hybrid check G99 (DRRH3), variety checks G96 (NDR359) and G100 (IR64), tolerant check G102 (Nagina22) and susceptible check G103 (Azucena)
Summary
Recent predictions on climate change indicate that high temperature episodes are expected to impact rice production and productivity worldwide. The present investigation was undertaken to assess the yield stability of 72 rice hybrids and their parental lines across three temperature regimes over two consecutive dry seasons using the additive main effect and multiplicative interaction (AMMI), genotype and genotype × environment interaction (GGE) stability model analysis. The parental lines G74 (IR58025B), G83 (IR40750R), G85 (C20R) and hybrids [G21 (IR58025A × KMR3); G3 (APMS6A × KMR3); G57 (IR68897A × KMR3) and G41 (IR79156A × RPHR1005)] were the most stable across the environments for grain yield They can be considered as potential genotypes for cultivation under high temperature stress after evaluating under multi location trials. The performance of the hybrids collectively dependent on the genotype, GEI of hybrids and identifying the best growing environments which helps in realizing the maximum grain yield Hybrids and their parental lines, must be evaluated across diverse environments to identify stable and high yield potential g enotypes[7]. The study was undertaken to evaluate rice hybrids for high yield and stability across seasons under variable temperature regimes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
