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草业科学  2014 

复合盐碱胁迫对燕麦种子发芽的影响

DOI: 10.11829\j.issn.1001-0629.2013-0267, PP. 451-456

Keywords: 燕麦,复合盐碱胁迫,盐浓度,萌发,种子

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Abstract:

?为明确复合盐碱胁迫对燕麦(Avenasativa)种子发芽的影响,将中性盐NaCl、Na2SO4与碱性盐NaHCO3、Na2CO3按不同比例混合,依照碱浓度逐渐增加的原则分为6个胁迫处理组,每组设定6种不同盐浓度,来测定36种复合盐碱胁迫条件下燕麦种子的发芽率、发芽势、胚根与胚芽长等生长指标。结果表明,在各胁迫处理组下,燕麦种子的发芽率与发芽势均随着盐浓度的增加而下降,且碱性盐比例越大下降越明显。在最高浓度胁迫下(144mmol·L-1),无碱性盐存在的胁迫组燕麦种子发芽率为25.6%,碱性盐比例最低的胁迫组为11.1%,其余各组处理则均为0。胚根与胚芽生长表现出与发芽率相似的变化规律,且胚根对胁迫更敏感。对各胁迫因素与发芽指标进行逐步回归分析,发现在众多胁迫因素中,盐浓度起主要作用。由于植物在种子发芽阶段主要受水分的控制,而在复合盐碱胁迫下,水势主要由盐浓度决定,因此,盐浓度是复合盐碱胁迫下燕麦种子发芽的决定性因素。

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