华南农业大学学报2017，Vol.38Issue(6)：34-43,10.DOI:10.7671/j.issn.1001-411X.2017.06.006
拔节期光强对水稻抗倒伏能力的影响及机理
Effects of light intensity during internode elongation on rice lodging resistance and its mechanism
摘要
Abstract
[Objective]To explore the effects of light intensity during internode elongation on rice (Oryza sativa L.) lodging resistance.[Method]Rice plants were subjected to different light intensities in phytotrons at the 1st (S1), 2nd (S2), 3rd (S3) and 1st to 3rd (S123) internode elongation stages. The lodging resistance of rice stem and the morphological and material mechanical traits of basal internodes were measured.[Result]The lodging index (LI) of rice stem significantly decreased with the increasing of light intensity. LI of medium or high light intensity treatments was 34.8%–73.9% lower than that of low light intensity treatment at the S123 internodes elongation stage. LI was significantly positively correlated with internode length, and negatively correlated with internode diameter, culm wall thickness and internode plumpness. The S2 stage was the most sensitive period of lodging resistance to light intensity variation. Light intensity had accumulative effects on lodging resistance. The variation coefficient of lodging index at the S123 stage was greater than those at the S1, S2 and S3 stages, and similar results were found in most morphological and material mechanical traits.[Conclusion]The key factors to determine the lodging resistance are internode length, culm wall thickness and internode plumpness. Light intensity can significantly change the three morphological traits of basal internodes, which further affect the material mechanical characteristics of rice stem and lodging resistance.关键词
水稻/倒伏指数/光强/形态性状/材料力学性状Key words
rice (Oryza sativa L. )/lodging index/light intensity/morphological trait/material mechanical trait分类
农业科技引用本文复制引用
李晓娟,梁开明,钟旭华,田卡,彭少兵,黄农荣,潘俊峰,刘彦卓..拔节期光强对水稻抗倒伏能力的影响及机理[J].华南农业大学学报,2017,38(6):34-43,10.基金项目
广东省自然科学基金重点项目(S2012020011043) （S2012020011043）
863 计划(2014AA10A605) （2014AA10A605）
广东省科技计划项目(2013B050800014,粤科规财字[2014]208 号) （2013B050800014,粤科规财字[2014]208 号）
