Stability of Rice Pollination in the Field under Hot and Dry Conditions in the Riverina Region of New South Wales, Australia

• MATSUI Tsutomu

  Experimental Farm, Graduate School of Agriculture, Kyoto University

• KOBAYASI Kazuhiro

  Faculty of Life and Environmental Science, Shimane University

• YOSHIMOTO Mayumi

  National Institute for Agro-Environmental Sciences

• HASEGAWA Toshihiro

  National Institute for Agro-Environmental Sciences

抄録

Even under extremely hot (40℃) conditions during anthesis, heat-induced floret sterility does not appear to be a serious issue for Australian rice growers. This contradicts previously reported temperature thresholds for floret sterility. To determine the factors associated with stable rice production under hot and dry conditions in the Riverina region of New South Wales (Australia), we examined rice (cv. 'Langi') pollination at different distances from the windward edge of a paddy field and its association with canopy microclimate. With an air temperature of 34.5℃ and a relative humidity of 20.7% during anthesis, poor pollination of florets occurred at the windward edge, but pollination remained stable farther from the edge. The temperature difference between the air and the panicles in the canopy reached as high as 6.8℃ under these conditions because of low humidity and strong transpirational cooling. Moreover, the length of the dehiscence at the base of the thecae during anthesis was long; this is a desirable trait for heat tolerance. The long basal dehiscence of the thecae of this cultivar and die lower panicle temperatures relative to the ambient temperature caused by high transpirational cooling appear to be the key factors responsible for stable pollination under the extremely high temperatures of the Riverina region.

収録刊行物

• Plant production science

  Plant production science 10 (1), 57-63, 2007-01-01

  日本作物学会

キーワード

• Anther dehiscence
• Floret sterility
• Heat stress
• Oryaza sativa L.
• Transpirational cooling

詳細情報

• CRID: 1570572702334005120
• NII論文ID: 110006197657
• NII書誌ID: AA11162156
• ISSN: 1343943X
• 本文言語コード: en
• データソース種別:
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