Effect of Exogenous Spd on Polyamines and Antioxidant System in Cucumber Seedlings Under Hypoxia Stress
Effect of Exogenous Spd on Polyamines and Antioxidant System in Cucumber Seedlings Under Hypoxia Stress
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发表时间：
2007
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通讯作者：
Sun Jin
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作者：
Sun Jin
外源亚精胺（Spd）处理对黄瓜（Cucumis sativus L.）以‘中农8号’为材料，进行了水培试验。结果表明：0.05 mmol·L-1的外源Spd能显著促进黄瓜幼苗的生长，并能有效缓解低氧胁迫对黄瓜幼苗的伤害。在低氧胁迫下，抗氧化酶活性与多胺含量密切相关。0.05 mmol·L-1外源Spd处理显著提高了内源Spd、精胺（Spm）和（Spd+Spm）/Put比值，降低了腐胺（Put）含量，提高了抗氧化酶活性，降低了O2-·产生速率、H2 O2和MDA含量。因此，适宜浓度的外源亚精胺促进了低氧胁迫下黄瓜幼苗的生长，提高了黄瓜幼苗对低氧胁迫的耐受性。
Effects of different exogenous spermidine (Spd) concentrations on polyamines contents, antioxidant enzyme activities, O2-· production rate, H2O2 and MDA contents in roots and leaves of cucumber (Cucumis sativus L.) cultivar ‘Zhongnong 8’ were investigated in hydroponics. The results showed that exogenous Spd at 0.05 mmol·L-1significantly enhanced the growth of cucumber seedlings and alleviated the damage of hypoxia stress efficiently. Under hypoxia stress, the activities of antioxidant enzymes were associated closely with polyamines contents. The addition of 0.05 mmol·L-1 exogenous Spd obviously increased endogenous leaves of Spd, spermine (Spm), and (Spd+Spm)/Put ratio, while decreased putrescine (Put) content, enhanced the activities of antioxidant enzymes, decreased the O2-· production rate, H2O2 and MDA contents. Therefore, exogenous Spd at a suitable concentration promoted the growth of cucumber seedlings under hypoxia stress, and improved the tolerance of cucumber seedlings to hypoxia stress.