Climate in Biosphere
Online ISSN : 2185-7954
Print ISSN : 1346-5368
ISSN-L : 2185-7954
Cold tolerance for sterility induced by low temperature at booting stage can be improved by warmer water temperature during vegetative growth
Hiroyuki SHIMONOMitsuru SUTOKuniaki NAGANO
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2012 Volume 12 Pages 1-5

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Abstract
The effects of warm water during vegetative growth on cold tolerance for sterility induced by low temperatures at the booting stage were investigated in a field experiment. In an experiment in Aomori Pref. and Miyagi Pref., four rice cultivars were grown under two water temperature conditions (control and warmer than control by 2.2 or 3.7°C) during vegetative growth over a short period of time (21 days after transplanting for 21-27 days), and tested for their cold tolerance. Warm water promoted the heading date up to four days and it did not affect the number of spikelets. Cool-water treatment induced spikelet sterility in the range of 84-95% in Aomori Pref. and 54-90% in Miyagi Pref., while warm water applied during vegetative growth decreased the spikelet sterility of all cultivars and in both locations by 2-11 percentage points in Aomori Pref. and by 2-25 percentage points in Miyagi Pref. The results indicate that applying warm water during vegetative growth over short periods of time can improve cold tolerance in rice in the field.
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© 2012 The Society of Agricultural Meteorology of Japan
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