应用生态学报2012，Vol.23Issue(12)：3377-3384,8.
断根对盐胁迫下玉米生长、光合及叶片抗氧化酶的影响
Effects of partial root excision on the growth, photosynthesis, and antioxidant enzyme activities of maize under salt stress
摘要
Abstract
A pot experiment was conducted to study the effects of partial root excision on the growth of two maize cultivars ( Zhengdan 958 and Denghai 9 ) throughout their growth period and the photosynthesis and leaf antioxidant enzyme activities at grain-filling stage under salt stress. Four treatments were installed, i. e. , control (no salt), low salt (0. 2% NaCl), moderate salt (0. 4% NaCl), and high salt (0.6% NaCl). Under low salt stress, the grain yield of Zhengdan 958 and Denghai 9 with partial root excision was increased by 13. 1% and 31. 4% , respectively, as compared with that of the cultivars with no root excision. At jointing stage, the growth of the cultivars with partial root excision was restrained, the root- and shoot dry masses under the same salt stresses being lesser than those of the cultivars with no root excision, but the growth under the conditions of no salt and low salt recovered quickly. At milk-ripe stage and under no salt and low salt conditions, the root- and shoot dry masses, leaf area, total root length, total root surface area, root activity, leaf chlorophyll content, and ear leaf net photosynthetic rate, stomatal conductance, transpiration rate, and CAT and POD activities of the cultivars with partial root excision were significantly larger than those of the cultivars with no root excision, while the shoot diameter and ear leaf MDA content were in adverse. Moderate and high salt stresses had greater effects on the cultivars with partial root excision. The root- and shoot dry masses, root morphology, and photosynthesis indices of the cultivars with partial root excision were smaller than those of the cultivars with no root excision, so did the grain yields. Throughout the growth period of the cultivars, the growth of the cultivars with partial root excision depended on the salt concentration, i. e. , was promoted under no and low salt,and inhibited under moderate and high salt conditions.关键词
玉米/盐胁迫/断根/灌浆期/光合作用/根系活力Key words
corn/ salt stress/ root excision/ grain-filling stage/ photosynthesis/ root activity分类
农业科技引用本文复制引用
张红,崔丽娜,孟佳佳,张海燕,石德杨,董树亭,张吉旺,刘鹏..断根对盐胁迫下玉米生长、光合及叶片抗氧化酶的影响[J].应用生态学报,2012,23(12):3377-3384,8.基金项目
国家自然科学基金项目(31171497)、玉米现代产业技术体系项目(nyhyzx07-003)、国家重点基础研究发展计划项目(2011CB100105)和农业部玉米产业技术体系项目(CARS-02)资助. （31171497）
