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

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

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  • NSTL
  • Elsevier
? 2021 Elsevier B.V.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.

Early-morning floweringFlower opening timeHeat-resilienceRiceYield-related traits

Ishimaru T.、Sasaki K.、Fukuta Y.、Lumanglas P.D.、Simon E.-V.M.、Hlaing K.T.、Oo Y.M.、Lwin T.M.、Htun T.M.、Myint T.T.、Hairmansis A.、Susanto U.、Ayyenar B.、Muthurajan R.、Hirabayashi H.、Kobayasi K.、Matsui T.、Yoshimoto M.

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Japan International Research Center for Agricultural Sciences (JIRCAS)

International Rice Research Institute (IRRI)

Division of New Genetics Yezin Agricultural University (YAU)

Department of Agricultural Research (DAR)

Indonesian Center for Rice Research (ICRR)

Department of Plant Biotechnology Tamil Nadu Agricultural University

Institute of Crop Science NARO

Faculty of Life and Environmental Sciences Shimane University

Faculty of Applied Biological Sciences Gifu University

National Institute for Agro-Environmental Sciences (NIAES) NARO

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2022

10.1016/j.fcr.2021.108400

Field Crops Research

Field Crops Research

SCI
ISSN：0378-4290
年,卷(期)：2022.277
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