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不同种类重金属胁迫对两种小麦产量及构成因素的影响

Keywords: 重金属胁迫,小麦,产量,影响

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Abstract:

以当前农业研究的热点领域——重金属污染为切入点,研究了大田Cd、Pb、As、Hg、Cr5种重金属胁迫对小麦(郑麦9023、小偃22)籽粒产量及构成因素的影响。结果表明重金属胁迫下,Cd、Pb、As、Hg、Cr重金属对产量三要素中单位面积群体穗数的影响最大,其次为穗粒数,对千粒重的影响最小;单位面积群体穗数对重金属Cr、Pb最为敏感,在旱田偏碱性的土壤上,Cr、Pb胁迫对小麦单位面积的群体穗数影响的临界含量分别约为187.5mg·kg-1和175mg·kg-1。对两个小麦品种的籽粒产量影响不同,郑麦9023籽粒产量依次为Cr2<Cr1<CK<Cd2<Hg1<As2<As1<Hg2<Pb1<Cd1<Pb2;小偃22籽粒产量依次为Cr2<Cr1<CK<Hg1<As2<Hg2<Cd1<Cd2<Pb2<As1<Pb1。重金属Cr对小麦的产量表现为抑制效应,Cd、Hg、Pb、As对小麦产量的影响表现为增产效应;不同种类重金属胁迫对小麦产量影响作用依次为Hg<Cd<As<Pb<Cr。

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