Comparison of Saline Tolerance of Different Kinds of Silage Maize
ZHANG Huili
XU Xing
ZHU Lin
Abstract：In order to screen the germplasm resources of salt-tolerant silage maize,five silage maize varieties were planted in Pingluo County of Ningxia with different saline-alkali content.Based on the values of photosynthetic gas exchange parameters,physiological indexes and agronomic traits measured in ripening stage,the salt tolerance for the five maize genotypes was evaluated through principal component analysis and the subordinate function method.The results showed that physiological indexes,photosynthetic gas exchange and agronomic traits were different among the five genotypes.The activity of catalase(CAT)was increased with the increase in severity of salt stress,and then decreased when the degree of stress reached a certain limit.The leaf temperature(TL)showed maximum when it was under severe stress,minimum under mild stress.The performance of five different varieties under different salt stress levels was inconsistent,under the condition of moderate stress,the highest values of stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci) and intercellular CO2 concentration/atmospheric CO2(Ci/Ca) were H14/A18;under severe stress,H242/1523 was the highest in all four cases.In the case of mild stress,the highest value of the four was Bei 21/1522.It was found that activity of peroxidase(POD)was significantly and positively correlated with activity of CAT and superoxide dismutase(SOD) through correlation analysis.There was a extremely significant positive correlation of Gs with Ci,Tr and Ci/Ca.After the comprehensive analysis of the degree of each index under different saline stress,the salt tolerance of severe stress was ranked as follows:H242/1523>Gui silage Number 1>Bei 21/1522>H14/1528>H14/A18;The order of salt tolerance in moderate stress was: H14/A18>Gui silage Number 1>Bei 21/1522>H242/1523>H14/1528;The salt tolerance of mild stress was ranked as follows: Bei 21/1522>H14/1528>H242/1523>Gui silage Number 1>H14/A18 according to the value of comprehensive evaluation value(D value).
Keywords：sliage maizeripening stageidentification of saline toleranceprincipal component analysissubordinate function method
Publication Date：2017-09-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 30-36,44 )