An early-morning flowering trait enhances heat-resilience at flowering

• DOI: 10.22541/au.161261657.79850333/v1
• Publication Date: 2021-02-06T13:03:14Z
• Authors: Tsutomu Ishimaru; Hlaing Thandar; Ye Oo; Tin Lwin; Kazuhiro Sasaki; Patrick Lumanglas; Eliza-Vie Simon; Tin Myint; Aris Hairmansis; Untung Susanto; Bharathi Ayyenar; Raveendran Muthur...; Hideyuki Hirabayashi; Yoshimichi Fukuta; Kazuhiro Kobayashi; tsutomu matsui; Mayumi Yoshimoto; Than Htun
• Keywords: Panicle; Trait

An early-morning flowering (EMF) trait is supposed to be effective in enhancing grain yield due mitigation of heat-induced spikelet sterility at rice. This study evaluated (i) phenotypic differences between a near-isogenic line carrying QTL for EMF trait, designated as IR64+qEMF3, and recurrent parent, IR64, under wide variation climates (ii) whether an can enhance heat stress flowering. IR64+qEMF3 had significant earlier flower opening time (FOT) diverse environmental conditions including temperate, subtropical, tropical regions. Under normal temperatures flowering, similar IR64 with some changes agronomic traits components. Field trials heat-vulnerable regions central Myanmar seven crop seasons showed that higher percentage filled grains contributed the significantly among components when plants were exposed daily maximum air around 36.5 oC or higher. Lower was attributed FOT during cooler early morning hours. first field clearly demonstrates enhancement heat-resilience