Effects of culm carbohydrate partitioning on basal stem strength in a high-yielding rice population

文献类型： 外文期刊

第一作者： Zhang, Jun

作者： Zhang, Jun;Zhang, Weijian;Zhang, Jun;Li, Ganghua;Liu, Zhenghui;Ding, Chengqiang;Tang, She;Chen, Lin;Wang, Shaohua;Ding, Yanfeng;Huang, Qingyu

作者机构：

关键词： Rice;High-yielding;Lodging;Culm strength;Carbohydrate partitioning

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2017 年 5 卷 6 期

页码：

收录情况： SCI

摘要： Rice culm carbohydrate transport can simultaneously affect grain filling and stem lodging resistance by regulating non-structural carbohydrate (NSC) and structural carbohydrate (SC) contents. However, the relationship between carbohydrate transposition and culm strength is not well documented. Accordingly, a high-yielding hybrid rice cultivar (Y Liangyou 2) was tested under different N fertilization regimes at two locations, Taoyuan (a special high-yield eco-site), Yunnan province and Danyang (a representative eco-site of the middle and lower Yangtze), Jiangsu province, China. Significantly higher grain yield and basal stem strength were found at Taoyuan than Danyang under all N rates throughout the two-year experiment. At heading stage, soluble sugars, starch, cellulose and lignin contents of the basal culm at Taoyuan were significantly 132.0%, 73.7%, 1.2%, and 62.7% higher than those at Danyang, respectively. At 20 days after heading, soluble sugars and starch content at Taoyuan decreased significantly compared to Danyang, but lignin content remained higher. Culm carbohydrate transport to kernels at Taoyuan was significantly greater than that at Danyang, and the proportion of soluble sugars and starch was correspondingly 62.9% lower. However, the proportion of lignin and cellulose was 22.7% higher at Taoyuan than that at Danyang. Soluble sugars and starch partitioning were significantly reduced under an increased nitrogen application rate, but SC partitioning was little affected. There were significant positive correlations between basal culm bending stress and dry weight and cellulose and lignin proportions at both locations under all N rates, suggesting that the higher SC proportion at 20 days after heading was primarily responsible for culm strength. These results suggest that high-yielding rice populations with greater culm strength require both moderate NSC transport and greater SC accumulation. (C) 2017 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.

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