作物学报2012，Vol.38Issue(1)：107-120,14.DOI:10.3724/SP.J.1006.2012.00107
灌溉方式对减轻水稻高温危害的作用
Role of Irrigation Patterns in Reducing Harms of High Temperature to Rice
摘要
Abstract
Possible irrigation patterns to reduce the injury of high temperature to rice growth and development were studied using two mid-season indica cultivars of Huanghuazhan and Shuanggui 1. Both high temperature (mean temperature during the day/night at 35.1°C/20.8°C) and normal temperature (mean temperature during the day/night at 29.0°C/20.8°C) treatments and three irrigation patterns, including alternate wetting and moderate soil drying (MD, plants were re-watered when soil water potential reached to -15 kPa), alternate wetting and severe soil drying (SD, plants were re-watered when soil water potential reached to -30 kPa), and well-watered (control, continuously flooded), were conducted during heading and grain filling. The grain yield arid quality of rice were investigated. The results showed that under either normal or high temperature, compared with the control, the MD significantly increased seed-setting rate, 1000-grain weight, grain yield, brown rice, milled rice and head rice, and reduced chalky grains and chalkiness degree. The MD also increased the break down viscosity and decreased the setback viscosity. The SD showed the opposite effects. The two cultivars behaved the same. These results indicated that the MD may maintain a higher grain yield and better quality of rice under high temperature. The reduction of relative humidity in the panicle canopy, decreased reactive oxygen (O2 ) production rate, elevated contents of ascorbic acid, reduced glutathione, and increased concentrations of cyto-kinins in leaves and spermidine and spermine in grains are the ecological and physiological reasons for reducing harms of high temperature to rice by the MD regime.关键词
水稻/高温/灌溉方式/产量/品质/生理机制Key words
Rice/ High temperature/ Irrigation patterns/ Grain yield/ Quality/ Physiological mechanism引用本文复制引用
段骅,俞正华,徐云姬,王志琴,刘立军,杨建昌..灌溉方式对减轻水稻高温危害的作用[J].作物学报,2012,38(1):107-120,14.基金项目
本研究由国家自然科学基金国际重大合作项目(31061140457),国家自然科学基金项目(30800670,31071360),江苏省基础研究计划项目(BK2009005)和2008年公益性行业(农业)科研专项经费(200803030)资助. （31061140457）
