論文

査読有り
2016年4月

Quantifying rice spikelet sterility in potential heat-vulnerable regions: Field surveys in Laos and southern India

FIELD CROPS RESEARCH
  • Tsutomu Ishimaru
  • ,
  • Seefong Xaiyalath
  • ,
  • Jagadeesh Nallathambi
  • ,
  • Rajendran Sathishraj
  • ,
  • Mayumi Yoshimoto
  • ,
  • Lathvilayvong Phoudalay
  • ,
  • Benjamin Samson
  • ,
  • Toshihiro Hasegawa
  • ,
  • Keiichi Hayashi
  • ,
  • Gurusamy Arumugam
  • ,
  • Raveendran Muthurajan
  • ,
  • Krishna S. V. Jagadish

190
開始ページ
3
終了ページ
9
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.fcr.2015.08.006
出版者・発行元
ELSEVIER SCIENCE BV

Global warming is projected to cause yield losses due to heat-induced spikelet sterility (HISS) in hot, vulnerable rice-growing regions, but reports documenting HISS at a regional level in the tropics are very limited. As a case study, HISS at flowering stage was surveyed under field conditions using local popular varieties in Savannakhet, Laos, and Tamil Nadu, India, during the dry season. At the field site in Savannakhet, sterility in variety Thadokkham1 (TDK1) was 10.8% when the maximum average temperature at heading was 32.9 degrees C, which increased to 23.3% at 37.3 degrees C. When plots were covered with a shading net, solar radiation was reduced by 60% at heading, which significantly reduced sterility to 10.0%. Panicle temperature estimates produced with a micrometeorology model revealed that shading during the hours when flowering occurs decreased panicle temperature by 2.2-2.6 degrees C. At the field sites in Tamil Nadu, sterility of variety Coimbatore 51 (CO51) was highly correlated with the maximum temperature at heading; sterility was around 5-10% when maximum average temperature was below 36.5 degrees C, which increased to 33.4% at 38.0 degrees C. Marking of opened spikelets at hourly intervals allowed us to detect increases in sterility as temperature increased from early morning until noon. We conclude that HISS at flowering stage can occur in local popular varieties grown in Savannakhet and Tamil Nadu during the hot, dry season. Effective protocols such as using a shading net and hourly marking of open spikelets are useful approaches to quantifying HISS during flowering stage across hot and potential heat-vulnerable rice-growing regions. (C) 2015 Elsevier B.V. All rights reserved.

Web of Science ® 被引用回数 : 9

リンク情報
DOI
https://doi.org/10.1016/j.fcr.2015.08.006
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000376052800002&DestApp=WOS_CPL

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