Relationship between characteristics of basal internodes and lodging and its physiological mechanism in direct-seeded rice

文献类型： 外文期刊

第一作者： Liu, Weiyang

作者： Liu, Weiyang;Liu, Yue-yue;Bao, Shuying;Lu, Yuya;Gai, Dongsheng;Fu, Xukun;Du, Juan;Guo, Liying;Zhang, Qiang;Geng, Yanqiu;Shao, Xiwen;Fan, Xuhong

作者机构：

关键词： basal internodes; direct-seeded rice; lodging; physiological mechanism

期刊名称：JOURNAL OF AGRONOMY AND CROP SCIENCE （ 影响因子：3.5； 五年影响因子：4.2 ）

ISSN： 0931-2250

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Lodging is an important factor that limits rice yield and the large-scale promotion of direct-seeded rice (DSR). The objective of this study was to clarify the relationship between the characteristics of basal internodes and lodging and the physiological mechanism underlying this process in DSR. A field study was conducted in Changchun, Jilin Province, China, using a japonica rice variety Jiyujing with two direct seeding cultivation methods, including dry DSR (DDSR), wet DSR (WDSR) and conventional-transplanted rice (CTSR) as a control in 2019 and 2020. Lodging-related physical parameters, morphological characteristics and carbohydrate components of basal internodes were investigated at heading stage (HS) and 30 days after heading stage (HS30). The results showed that WDSR increased lodging index (LI) and lodging rate compared with CTSR and DDSR. LI increased rapidly from HS to HS30, primarily because of the significant reduction in the breaking strength (M). Correlation analysis revealed that the M of N4 internode was significantly positively correlated with culm plumpness and structural carbohydrate proportions at HS30. Culm plumpness decreased significantly, due to a decrease in nonstructural carbohydrate (NSC) content then primarily the decrease in starch proportions and content. Compared with CTSR and DDSR, WDSR decreased culm wall thickness, dry weight per centimetre of the culm and leaf sheaths, and the proportions and contents of cellulose, lignin and starch of internode, resulting in the decrease in internode breaking strength. Thus, it was concluded that the DSR reduced internode strength by reducing internode plumpness and carbohydrate content, thus decreasing lodging resistance.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序