Effects of water stress on starch synthesis and accumulation of two rice cultivars at different growth stages

作者：Guangyi Chen, Ligong Peng, Jing Gong, Jin Wang, Chaoyue Wu, Xiaodong Sui, Yunfeng Tian, Mingming Hu, Congmei Li, Xingmei He, Hong Yang, Qiuqiu Zhang, Yuyuan Ouyang, Lan Yan, Tian Li · 发表于：Frontiers in Plant Science · 年份：2023 · DOI：10.3389/fpls.2023.1133524 · 被引用次数：24 · 研究领域：Rice Cultivation and Yield Improvement、GABA and Rice Research、Plant responses to water stress

Rice is a water intensive crop and soil water conditions affect rice yield and quality. However, there is limited research on the starch synthesis and accumulation of rice under different soil water conditions at different growth stages. Thus, a pot experiment was conducted to explore the effects of IR72 (indica) and Nanjing (NJ) 9108 (japonica) rice cultivars under flood-irrigated treatment (CK, 0 kPa), light water stress treatment (L, -20 ± 5 kPa), moderate water stress treatment (M, -40 ± 5 kPa) and severe water stress treatment (S, -60 ± 5 kPa) on the starch synthesis and accumulation and rice yield at booting stage (T1), flowering stage (T2) and filling stage (T3), respectively. Under LT treatment, the total soluble sugar and sucrose contents of both cultivars decreased while the amylose and total starch contents increased. Starch synthesis-related enzyme activities and their peak activities at mid-late growth stage increased as well. However, applying MT and ST treatments produced the opposite effects. The 1000-grain weight of both cultivars increased under LT treatment while the seed setting rate increased only under LT3 treatment. Compared with CK, water stress at booting stage decreased grain yield. The principal component analysis (PCA) showed that LT3 got the highest comprehensive score while ST1 got lowest for both cultivars. Furthermore, the comprehensive score of both cultivars under the same water stress treatment followed the trend of T3 > T2 > T1, and NJ 9108...