干旱胁迫对野生和栽培大豆根系特征及生理指标的影响

Effects of Drought Stress on Root Characteristics and Physiological Indexes of Glycine soja and Glycine max

以4份野生大豆(永5、永26、永46、永52)和4份栽培大豆(中黄13、冀豆12、秦皇10、秦皇29)为材料,用不同浓度(0%,10%,20%,30%)PEG6000模拟水分胁迫,探讨干旱胁迫对野生和栽培大豆幼苗根系特征和生理指标的影响。结果表明:随着干旱胁迫的增加,不同大豆材料的根系特性存在显著差异,大豆抗旱性与总根长、总根表面积、总根体积呈正相关,与平均根直径呈负相关;隶属函数综合评定结果表明4份野生大豆的抗旱性均强于栽培大豆,其中栽培大豆中黄13抗旱性最差。干旱胁迫下,野生大豆、栽培大豆的叶片相对含水量呈下降趋势,丙二醛含量均比0%PEG6000有所增加,但不同材料间叶绿素含量、超氧化物歧化酶(SOD)活性和过氧化物酶(POD)活性的表现趋势不同,说明野生大豆和栽培大豆的抗旱生理指标存在一定的差异。

Four wild soybeans（Yong5,Yong26,Yong46,Yong52） and 4 cultivated soybeans（Zhonghuang 13,Jidou12,Qinhuang 10,Qinhuang 29） were used as materials in this study to discuss the effects of drought stress on root characteristics and physiological indexes of wild soybeans and cultivate soybeans.Drought stress conditions was simulated by different concentrations of PEG6000.The results showed that,the root characteristics of different soybean materials were significantly different with the increase of drought stress.Besides,drought resistance of soybean was positively correlated with total root length,total root surface and total root volume of the root,while drought resistance of soybean was negatively correlated with average roots diameter.The results of membership functions and comprehensive evaluation showed that wild soybean materials had stronger drought stress resistance than cultivated soybean,and Zhonghuang 13 cultivated soybean had the weakest drought stress resistance in all cultivated soybeans,besides,relative water contents of wild soybeans and cultivate soybean leaves were decreased and MDA content was increased than 0%PEG6000 under drought stress.However,the chlorophyll content,the activities of superoxide dismutase（SOD） and peroxidase（POD） had different performances,which indicated that there were some differences between the drought resistance physiological indexes of wild and cultivated soybeans.