Effects of high night temperature on grain quality under field chamber system condition
2017
Ke Liu | Xiaoyan Wang | Bilin Lu | Xiaohai Tian | Punzalan, B.R. | Laza, R.C. | Yunbo Zhang
Temperature increase during night time as a result of global warming is greater than during daytime and is projected to accelerate in the future. However, little information is known about grain quality responses to a small increase in night time temperature. Field experiments were conducted to IRRI [International Rice Research Institute] in 2010 wet season (WS) and 2011 dry season (DS) to evaluate the effects of high night temperature on grain quality. Ten varieties originated from different countries were grown in temperature-controlled filled chambers. Increase of 3.9 deg C and 3.8 deg C in night temperature was imposed on the plants from 40-120 days after transplanting (DAT) from 1900 h to 0600 h. The results showed that the chalkiness in most rice varieties was increased by HNT, especially the chalk size in grain (10-50% and 50%), but there were no significant differences in AC, BR and MR between HNT and LNT. Grain weight was reduced under HNT in all test rice varieties as a result of decrease in grain width. There was no significant effect of HNT on grain length, which resulted in the increase in length/width ratio. These results suggest that chalkiness was more sensitive to HNT than other grain quality characteristics. In regard to this, researchers should put more attention on the formulation of chalky grain in the future to improve the resistance of rice to increasingly warmer night.
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