Morphology and Dry Matter Accumulation in Rice (Oryza sativa L.) Seedlings Under Drought Conditions

• Dien Don Cong

  Laboratory of Plant Nutrition, Graduate School of Bioresource and Bioenvironmental Sciences, School of Agriculture, Kyushu University | Laboratory of Plant Nutrition, Division of Molecular Biosciences, Department of Biosciences & Biotechnology, Faculty of Agriculture, Kyushu University

• 望月 俊宏

  九州大学大学院農学研究院資源生物科学部門 : 教授

• 山川 武夫

  九州大学大学院農学研究院生命機能科学部門 : 准教授

抄録

Drought is one of the main limitations of rice (Oryza sativa L.) productivity and is a severe problem　in many regions in the world. In Vietnam, drought affects approximately 22% of the area under rice cultivation　and usually occurs during the vegetative stage. One of the difficulties in breeding rice for drought tolerance　is the lack of genotypic variation among rice populations. In this study, seedlings of 172 rice varieties　from different regions around the world were screened under drought and non–drought conditions in　order to explore response to drought stress among different rice genotypes.　Considerable variation in the leaf rolling index (LRI), shoot dry weight, root dry weight (RDW), shoot　length (SL), root length (RL), and drought resistance index (DRI) was found between rice varieties over　two screening periods. There were positive correlations between DRI and drought to control ratios in RDW,　SL, and RL. A negative correlation between DRI and LRI among varieties suggested that LRI might be useful a　drought tolerance indicator in rice seedlings. These negative correlations were greater in early afternoon　observations than in morning observations. Correlations were also greater in the early stages of drought　stress than under severe drought. These results indicate that leaf rolling should be observed in the early　afternoon (when drought stress is at its daily maximum) and in the early stages of drought development,　before stress becomes severe.

収録刊行物

• Journal of the Faculty of Agriculture, Kyushu University

  Journal of the Faculty of Agriculture, Kyushu University 62 (2), 309-322, 2017-09-08

  九州大学大学院農学研究院

キーワード

• drought tolerance
• rice
• screening methods
• vegetative stage

詳細情報

• CRID: 1390290699661423616
• NII論文ID: 120006349092
• NII書誌ID: AA00247166
• DOI: 10.5109/1833811
• HANDLE: 2324/1833811
• ISSN: 00236152
• 本文言語コード: en
• データソース種別:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles