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草业学报  2014 

H2O2胁迫下豌豆初生根及抗氧化酶系统对外源Ca2+的响应

DOI: 10.11686/cyxb20140623, PP. 189-197

Keywords: 豌豆,H2O2,初生根,外源Ca2+,抗氧化物酶

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Abstract:

以豌豆品种“陇豌一号”为材料,通过对豌豆种子萌发初期初生根生理特性的研究,探索提高豌豆初生根外源H2O2胁迫条件下抗性能力的途径。运用生理生化方法,测定H2O2胁迫下豌豆初生根在外源Ca2+处理后的弯曲率和根系活力,并对豌豆初生根内的丙二醛(MDA)含量、相对膜透性、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性进行测定。结果显示,80mmol/L的H2O2处理下的豌豆初生根正常生长受到显著抑制,但是经过Ca2+处理后,根系生长抑制作用得到缓解,根系活力得以恢复。外施10mmol/LCa2+初生根MDA值较CK1降低了37.32%,并显著地提高了POD,SOD,CAT和APX的活性,其值分别为51.946U/(mg·min),865.174U/gFW,1.9739mmol/(L·g·min)和2.569μmol/(L·g·min)。总之,外源施加Ca2+能够有效降低H2O2造成的氧化胁迫,缓解对初生根细胞膜的伤害,降低质膜透性,增强初生根系抗氧化酶活性,达到抵抗逆境胁迫的目的。

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