锌镉单一胁迫对小麦和稗草生理生化特性的影响

Effects of Zn and Cd on Physiological and Biochemical Characteristics of Triticum aestivum and Beckmannia syzigachne

通过水培实验,采用不同浓度的ZnSO4、CdSO4溶液分别对小麦和稗草进行单一胁迫处理,分析小麦和稗草在萌发及两叶一心时期的生理生化特性,探讨小麦和稗草在锌、镉单一胁迫下的生理变化规律。结果表明:在同一水平锌、镉单一胁迫处理下,小麦和稗草体内游离脯氨酸、可溶性糖、可溶性蛋白及丙二醛含量总体均呈现出随着培养时间延长而升高的态势。随着锌、镉单一胁迫处理浓度的升高,小麦和稗草体内叶绿素、可溶性蛋白、过氧化物酶活性均表现出先上升后下降,而游离脯氨酸、丙二醛含量则表现出持续升高趋势。小麦和稗草体内可溶性糖含量在锌胁迫下均表现为先升高后下降,而在镉胁迫下表现为先下降后上升趋势。因此,小麦和稗草对轻度锌、镉单一胁迫具有一定的耐性。

Through the hydroponic experiments,Triticum aestivum and Beckmannia syzigachne were treated with single stress by different concentrations of ZnSO4 and CdSO4 solutions.The physiological and biochemical characteristics of T.aestivum and B.syzigachne in germination and two-leaf one-heart period were analyzed,and the physiological changes under single stress of Zn and Cd were discussed.The results show that at the same processing level,under the stress of single Zn and single Cd,the contents of proline,soluble sugar,soluble protein,and MDA show an increasing trend in T.aestivum and B.syzigachne.With the increase of treatment concentration,the chlorophyll,soluble protein and peroxidase in T.aestivum and B.syzigachne increase firstly then reduce,but the contents of proline and MDA show a continuous upward trend.The contents of soluble sugar in T.aestivum and B.syzigachne increase firstly then reduced under the stress of Zn,while reduce firstly then increase under the stress of cadmium.Therefore,T.aestivum and B.syzigachne have certain tolerance to mild Zn and Cd single stress.