盐胁迫下黄豆亚属植物游离脯氨酸积累响应的差异分析

The difference analyses on free proline metabolism of plant soybeans subgenus under salt stress

以中国同一纬度的不同黄豆亚属植物为试验材料,通过分析栽培大豆、半野生大豆、耐盐型野生大豆、盐敏感型野生大豆在盐胁迫下的生长及游离脯氨酸代谢的响应过程,研究了黄豆亚属植物生理代谢的演化趋势及进化规律.结果表明:耐盐型野生大豆游离脯氨酸含量的增加主要取决于鸟氨酸合成途径的增强;栽培大豆游离脯氨酸含量的变化与谷氨酸合成途径的增强及其降解途径的显著增加有关;半野生大豆游离脯氨酸含量的变化与鸟氨酸、谷氨酸合成途径的增强以及降解途径的降低均密切相关.黄豆亚属植物适应环境选择的压力以及人工选育的需要,体内游离脯氨酸代谢途径发生了显著的变化.

In order to explore the different physiological metabolism evolution trend and evolution between cultivated soybean, semi-wild soybean, salt tolerance wild soybean, salt sensitive wild soybean,the response of growth and metabolism process of proline under salt stress were investigated. The results showed that,the increasing proline content of salt tolerance wild soybean depended on the enhancing of ornithine pathway; the change of proline content in cultivated soybean depended on the enhancing of both glutamate pathway and degradation; and that of semi-wild soybean depends on all three pathways. Significant changes had happened in proline metabolism pathway of soja in order to adapt to the environment selection pressure and the requirement for artificial breeding.