盐胁迫对黄瓜幼苗根系脯氨酸和多胺代谢的影响
首发时间:2006-07-21
摘要:采用营养液栽培,研究了盐胁迫对抗盐能力不同的两个黄瓜品种幼苗根系脯氨酸(Pro)和多胺(PAs)代谢的影响。结果表明,盐胁迫通过提高吡咯啉-5-羧酸合成酶(P5CS)活性,抑制脯氨酸脱氢酶(ProDH)活性,从而引起Pro含量显著升高,抗盐性较强的‘长春密刺’三者变化幅度显著大于抗盐性较弱的‘津春2号’;盐胁迫下‘长春密刺’根系精氨酸脱羧酶(ADC)、鸟氨酸脱羧酶(ODC)和s-腺苷蛋氨酸脱羧酶(SAMDC)活性升高显著大于‘津春2号’,腐胺(Put)合成后迅速转化为亚精胺(Spd)和精胺(Spm),而‘津春2号’根系多胺氧化酶(PAO)活性升高显著大于‘长春密刺’,引起Put显著积累;随着Put积累开始降低,两品种根系Pro含量显著增加。表明盐胁迫诱导黄瓜幼苗根系较高的Pro、Spd、Spm含量和较低的Put含量有利于提高幼苗对盐胁迫逆境的适应能力,盐胁迫下黄瓜幼苗根系PAs代谢和Pro代谢密切相关,Put的积累一定程度上促进了Pro含量的增加。
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Effects of Salt Stress on Proline and Polyamines Metabolism in Cucumber (Cucumis sativus L.)Seedlings
Abstract:Two cucumber cultivars with different salt-tolerance were hydroponically cultured to study the effects of salt stress on proline (Pro) and polyamines (PAs) metabolism in the roots of cucumber seedlings. The results showed that salt stress induced the significant accumulation of Pro by enhancing the activity of P5CS and inhibiting the activity of ProDH. The changes in ‘Changchun mici’ (stronger salt-tolerance cultivar) seedlings were more significant than in ‘Jinchun No. 2’ (lower salt-tolerance cultivar) seedlings. The increases of ADC, ODC and SAMDC activities were much higher in ‘Changchun mici’ seedlings under salt stress, which induced the rapid conversion of Spd and Spm into Put. However, the increase of PAO activity was much higher in ‘Jinchun No. 2’ seedlings, which induced the significant accumulation of Put. With the decrease of Put accumulation, Pro increased significantly in the roots of two cultivars. It indicated that the high level of Pro, Spd and Spm and the low level of Put could enhance the salt adaptive capability of seedlings. PAs metabolism correlated with Pro metabolism under salt stress. The accumulation of Put promoted the increase of Pro contents.
Keywords: Salt stress, Cucumber seedlings, Proline, Polyamines
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