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An early-morning flowering trait in rice can enhance grain yield under heat stress field conditions at flowering stage

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Title An early-morning flowering trait in rice can enhance grain yield under heat stress field conditions at flowering stage
 
Creator Ishimaru, Tsutomu
Hlaing, Khin Thandar
Oo, Ye Min
Lwin, Tin Mg
Sasaki, Kazuhiro
Lumanglas, Patrick D.
Simon, Eliza-Vie M.
Myint, Tin Tin
Hairmansis, Aris
Susanto, Untung
Ayyenar, Bharathi
Muthurajan, Raveendran
Hirabayashi, Hideyuki
Fukuta, Yoshimichi
Kobayasi, Kazuhiro
Matsui, Tsutomu
Yoshimoto, Mayumi
Htun, Than Myint
 
Subject rice
flowering
grain
phenotypes
yields
temperature
 
Description An early-morning flowering (EMF) trait is supposed to be effective in enhancing grain yield due to mitigation of heat-induced spikelet sterility at flowering in rice. This study evaluated (i) phenotypic differences between a near-isogenic line carrying a QTL for EMF trait (designated as IR64 +qEMF3) and a recurrent parent, IR64, under wide variation in climates and (ii) whether the EMF trait can enhance grain yield under heat stress at flowering. IR64 +qEMF3 had significant earlier flower opening time (FOT) in diverse environmental conditions including temperate, subtropical, and tropical regions. FOT differentially responded to maximum and minimum air temperatures between genotypes. Under non-heat stress temperatures at flowering, IR64 +qEMF3 had similar grain yield to IR64 with minimal changes in yield components. Seven field trials in heat-vulnerable regions of Myanmar for multiple years showed that higher percentage of grain set contributed to the significantly higher grain yield in IR64 +qEMF3 when plants were exposed to daily maximum air temperatures around 36.1 °C or higher. Lower spikelet sterility in IR64 +qEMF3 was attributed to the earlier FOT during cooler early morning hours. This is the first field study that clearly demonstrates the enhancement of grain yield due to EMF trait under diverse heat stress field conditions at flowering.
 
Date 2022-03
2023-01-16T08:44:47Z
2023-01-16T08:44:47Z
 
Type Journal Article
 
Identifier Ishimaru, Tsutomu, Khin Thandar Hlaing, Ye Min Oo, Tin Mg Lwin, Kazuhiro Sasaki, Lumanglas, P.D., Simon, E.-V.M. et al. 2022. An early-morning flowering trait in rice can enhance grain yield under heat stress field conditions at flowering stage. Field Crops Research 277:108400.
1872-6852
https://hdl.handle.net/10568/127164
https://doi.org/10.1016/j.fcr.2021.108400
 
Language en
 
Rights Copyrighted; Non-commercial educational use only
Limited Access
 
Publisher Elsevier
 
Source Field Crops Research