Genotypic Variations in Response of Lateral Root Development to Fluctuating Soil Moisture in Rice
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概要
- 論文の詳細を見る
Developmental plasticity in lateral roots may be one of the key traits for the growth of rice plants under soil moisture fluctuations. We aimed to examine responses in seminal root system development to changing soil moisture for diverse rice cultivars. Special attention was paid to the two different types of lateral roots; the generally long, thick L type capable of branching into higher orders, and the non-branching S type. Plants were grown in half-split polyvinyl chloride tubes fixed with transparent acrylic plate for root observation under glasshouse conditions. When plants were grown first under drought conditions, then rewatered, the seminal root system development in terms of dry weight and total length was promoted as compared with plants grown under continuously well-watered conditions in IRAT 109 and Dular, drought tolerant cultivars. Promoted production of L type lateral roots mainly contributed to the development of the longer seminal root system. Plants exposed to soil submergence before they were grown under drought conditions did not show such promoted responses in these two cultivars. However, in KDML 105, a drought tolerant cultivar, the production of especially L type laterals was substantially promoted under drought and rewatered conditions. Honenwase was characterized by the shallow root system and great reduction in root system length when soil moisture becomes limited. These facts show that genotypic variations exist in the plastic response of rice seminal root system and that the L type lateral root plays a key role in manifestation of this plasticity.
- 日本作物学会の論文
著者
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Yamauchi Akira
Graduate School of Bioagricultural Sciences, Nagoya University
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Banoc D
Nagoya Univ. Nagoya Jpn
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Banco Dionisio
Graduate School Of Bioagricultural Sciences Nagoya University
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Yamauchi A
Nagoya Univ.
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Wade L
International Rice Res. Inst. Makati City Phl
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Yamauchi Akira
Graduate School Of Bioagricultural Sciences Nagoya University
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Kamoshita Akihiko
Crop, Soil and Water Sciences Division, International Rice Research Institute
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KAMOSHITA Akihiko
International Rice Research Institute, MCPO
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WADE Len
International Rice Research Institute, MCPO
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Banoc Dionisio
Graduate School of Bioagricultural Sciences, Nagoya University
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Pardales Jose
Philippine Root Crop Research & Training Center
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Wade Len
International Rice Research Institute Mcpo
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Pardales J
Philippine Root Crop. Res. And Training Center Leyte Phl
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Kamoshita Akihiko
International Rice Research Institute Mcpo
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