Influence of temperature and relative humidity on grain sterility in Rice

Abeysiriwardena, Z. and Ohba, K. and Maruyama, A. (2002) Influence of temperature and relative humidity on grain sterility in Rice. Journal of the National Science Foundation of Sri Lanka, 30 (1-2). pp. 33-41.

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Almost complete and uniform grain sterility in rice over large areas has become a serious problem in the warm and humid lowland region in Srilanka. In view of this, the influence of high temperature at low and very high relative humidity (RH) levels and normal temperature at very low and normal RH levels on the spikelet surface temperature and grain sterility in rice at heading were studied under controlled environment. Almost complete grain sterility in rice was induced by high temperature (35°C day/30°C night) when coupled with high RH (85-90%) at heading. Reduction in RH by 30% at high temperature resulted in decrease in grain sterility but made no significant increase in the completely filled grain percentage which was negligibly low at both very high and low RH levels. Under the normal temperature of 30°C day/25°C night, about two-fold increase in grain sterility at very low RH (35-40%) over the lowest recorded 13.8% grain sterility at normal RH (65-70%) was observed. Percent partially filled grains were not found to be influenced by both temperature and RH of the surrounding atmosphere. The spikelet surface temperature in rice was always several degrees less than the atmospheric temperature and increase in atmospheric temperature at heading resulted in increase in spikelet surface temperature. At a given at, atmospheric temperature, higher the RH, higher the spikelet surface temperature at heading. Spikelet surface optimum and critical high temperatures for grain sterility appeared to be around 26°C and between 26°C and 31°C but close to 31°C, respectively

Item Type: Article
Uncontrolled Keywords: Grain sterility, Heading, Relative humidity, Rice, Spikelet, Temperature
Author Affiliation: Rice Research and Development Institute, Batalagoda, Ibbagamuwa. National Agricultural Experiment Station, Nishigoshi, Kumamoto, 861-11, Japan
Subjects: Plant Production
Crop Improvement
Divisions: Other Crops
Depositing User: Ms Ishrath Durafsha
Date Deposited: 31 Oct 2014 05:17
Last Modified: 31 Oct 2014 05:17
Official URL:

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