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中国沙漠  2013 

干旱胁迫对不同株型玉米大喇叭口期生长的影响

DOI: 10.7522/j.issn.1000-694X.2013.00150

Keywords: 干旱胁迫,玉米,株型,大喇叭口期,生长

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Abstract:

干旱胁迫条件下,在大喇叭口期对2种株型玉米自交系(紧凑株型的廊黄及昌7-2和平展株型的TS141)的形态、生理生化特性进行了研究。结果表明:(1)干旱胁迫导致3个自交系的叶夹角、叶长、叶宽和株高趋于减小,叶向值增大;与廊黄及昌7-2相比,干旱胁迫后,TS141的叶夹角、叶长、叶宽及株高有较大的降低幅度,叶向值有较小的增加幅度。(2)干旱胁迫处理后,3个自交系的地上部鲜重、地下部鲜重、鲜干比、根长和根数都有不同程度的下降;根冠比加大;与TS141相比,廊黄及昌7-2变化的幅度较小;紧凑株型玉米自交系在干旱胁迫下仍能保持较正常的根系形态。(3)干旱胁迫后,3个自交系的相对电导率、丙二醛、脯氨酸、可溶性糖含量、保护酶活性都有不同程度的升高,相对电导率及丙二醛含量在TS141中的上升幅度大于廊黄和昌7-2,而脯氨酸、可溶性糖含量以及保护酶活性在廊黄和昌7-2中上升的幅度大于TS141。(4)干旱胁迫后,3个自交系的雌、雄穗发育都受到不同程度的影响,但廊黄及昌7-2受到的影响小于TS141,花丝数量远远多于TS141。

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