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草业科学  2014 

喷施IAA对紫花苜蓿幼苗铝毒害的缓解作用

DOI: 10.11829\j.issn.1001-0629.2013-0517, PP. 1323-1329

Keywords: 紫花苜蓿,铝胁迫,吲哚乙酸

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Abstract:

?设置5个不同的吲哚乙酸(IAA)浓度(0、2、4、6和8mg·L-1),采用叶面喷施的方法,研究不同浓度IAA对缓解紫花苜蓿(Medicagosativa)幼苗铝胁迫伤害的影响,结果表明,铝胁迫抑制了紫花苜蓿幼苗的生长,根长、侧根数、地上和地下生物量随处理时间部分显著降低,并且根尖和顶芽的IAA含量显著下降(P<0.05)。喷施不同浓度的IAA对铝胁迫紫花苜蓿幼苗的生长有不同程度的促进作用,根长和侧根数增加,地上和地下生物量提高;喷施IAA显著降低根系的铝含量,提高了铝胁迫苜蓿的叶绿素含量,降低了根系丙二醛(MDA)含量和电导率。在5个IAA处理浓度中,6mg·L-1处理对苜蓿铝毒的缓解作用最明显,与单独铝胁迫对照处理相比,各项指标之间的差异均达到显著水平。本研究结果表明铝胁迫紫花苜蓿生长受抑制与内源IAA的积累降低密切相关。

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