Effects of High Temperature and Strong Light Combine Stress on Yield and Quality of Early <i>Indica</i> Rice with Different Amylose Content during Grout Filling |
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Authors: | Xiaofeng Ai Ruoyu Xiong Xueming Tan Haixia Wang Jun Zhang Yongjun Zeng Xiaohua Pan Qinghua Shi Taoju Liu Yanhua Zeng |
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Institution: | 1
Ministry of Education and Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural
University, Nanchang, 330045, China2
Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China |
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Abstract: | High temperature (HT) accompanied with strong light (SL) often occurs in early indica rice production during
grout filling stage in southern China, which accelerates grain ripening. Two indica rice cultivars with different
amylose content (Zhongjiazao17, ZJZ17, high amylose content; Xiangzaoxian45, XZX45, low amylose content)
were grown under control (CK), HT, and HT+SL conditions during grout filling to determine the effects on grain
yield and quality of rice. The results showed that compared with CK, HT and HT+SL significantly reduced the
1000-grain weight and filled grain rate whether in high or low amylose content early indica rice cultivars during
grout filling, resulting in a significantly lower grain yield. Meanwhile, HT and HT+SL significantly decreased the
milled rice rate, brown rice rate and head rice rate, whereas significantly increased chalky rate and chalky degree;
and breakdown decreased and setback, pasting temperature increased in the cultivars, leading to the poor processing, appearance and cooking and eating quality of early indica rice cultivars. Compared with HT, the yield of
ZJZ17 was significantly decreased under HT+SL, due to the lower 1000-grain weight. However, the effect of
HT+SL on rice quality varied in the cultivars. In general, the yield and rice quality of ZJZ17 were relatively poor
under HT+SL. Our results suggested that HT and HT+SL during grout filling had significant damage to the yield
and quality of early indica rice cultivars, especially HT+SL, while the high amylose cultivar ZJZ17 showed a higher
negative effect under HT+SL. |
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Keywords: | High temperature-strong light double stress yield appearance quality cooking and eating quality |
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