应用生态学报2015，Vol.26Issue(1)：39-45,7.
大田增强UV-B辐射对元阳梯田地方水稻茎秆性状和倒伏指数的影响
Effects of enhanced UV-B radiation on culm charateristics and lodging index of two local rice varieties in Yuanyang terraces under field condition
摘要
Abstract
Two local rice varieties (Baijiaolaojing and Yuelianggu) were cultivated in situ in Yuanyang terraces,China,in 2012 and 2013 to investigate the effect of enhanced UV-B radiation condition (0,2.5,5.0 and 7.5 kJ · m-2) on internode characteristics including length,culm diameter,culm wall thickness from the first to the fourth internode,as well as the lodging index.The results showed that UV-B radiation had no significant influence on internode length and culm,but significantly reduced the culm wall thickness,with that of the fourth internode region decreased by 11.6％ to 19.6％ under 7.5 kJ · m-2 UV-B radiation.The enhanced UV-B radiation increased the lodging index of rice varieties,making them more prone to lodging.The fourth internode had the highest lodging index which was higher than the lodging critical value (200).The decrease in culm wall thickness due to the enhanced UV-B radiation could be responsible for the increasing lodging risk of rice varieties grown in Yuanyang terraces.关键词
UV-B辐射/元阳梯田/地方水稻/倒伏指数/茎壁厚Key words
UV-B radiation / Yuanyang terraces / local rice variety / lodging index / culm wall thickness分类
生物科学引用本文复制引用
何永美,湛方栋,祖艳群,徐渭渭,李元..大田增强UV-B辐射对元阳梯田地方水稻茎秆性状和倒伏指数的影响[J].应用生态学报,2015,26(1):39-45,7.基金项目
国家自然科学基金项目(31060083,41205113,31460141)资助. （31060083,41205113,31460141）
