A simple,rapid and reliable bioassay for evaluating seedling vigor under submergence in <Emphasis Type="Italic">indica</Emphasis> and <Emphasis Type="Italic">japonica</Emphasis> rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) |
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Authors: | Oliver E Manangkil Hien Thi Thu Vu Shinya Yoshida Naoki Mori Chiharu Nakamura |
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Institution: | (1) Laboratory of Plant Genetics, Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan;(2) Hyogo Institute of Agriculture, Forestry and Fishery, Kasai Hyogo, 679-0198, Japan |
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Abstract: | Submergence is a major stress causing yield losses particularly in the direct-seeded rice cultivation system and necessitates
the development of a simple, rapid and reliable bioassay for a large scale screening of rice germplasms with tolerance against
submergence stress. We developed two new bioassay methods that were based primarily on the seedling vigor evaluated by the
ability of fast shoot elongation under submerged conditions, and compared their effectiveness with two other available methods.
All four bioassay methods using cultivars of 7 indica and 6 japonica types revealed significant and consistent cultivar differences in seedling vigor under submergence and/or submergence tolerance.
Japonica cultivars were more vigorous than indica cultivars, with Nipponbare being the most vigorous. The simplest test tube method showed the highest correlations to all
other methods. Our results suggest that seedling vigor serves as a submergence avoidance mechanism and confers tolerance on
rice seedlings to flooding during early crop establishment. A possible relationship is discussed between seedling vigor based
on fast shoot elongation and submergence tolerance defined by recovery from submergence stress. |
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Keywords: | indica japonica Rice (Oryza sativa L ) Seedling vigor Submergence tolerance |
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