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首页> 外文期刊>Acta Physiologiae Plantarum >Exogenous proline significantly affects the plant growth and nitrogen assimilation enzymes activities in rice (Oryza sativa) under salt stress
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Exogenous proline significantly affects the plant growth and nitrogen assimilation enzymes activities in rice (Oryza sativa) under salt stress

机译：外源性脯氨酸显着影响盐胁迫下水稻（Oryza Sativa）的植物生长和氮同化酶活性

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摘要

Salinity has been shown to be a major factor contributing to low nitrogen availability in plants. To verify the changes in nitrogen metabolism activity as affected by the exogenous application of proline under salt stress and its relation to salt tolerance, in vitro rice shoot apices were used as a model to study the growth performance and changes in nitrogen assimilation activities in two Malaysian rice cultivars MR 220 and MR 253. Results revealed that salt stress greatly reduced the plant height, shoot nitrate (NO3-) content, shoot glutamine synthetase (GS), and root nitrate reductase (NR) activities in both cultivars. Supplementation of proline significantly increased the plant height, number of roots, root NO3- content, root NR, and root GS activities under salt stress in both cultivars with greater enhancement in MR 253 than MR 220. The results also indicated that MR 253 possessed higher nitrite reductase (NiR) and glutamate synthase (NADH-GOGAT) activities as compared with MR 220 in all tested treatments. It was suggested that the NO3- content, NR, and GS activities played important roles in regulating nitrogen metabolism under salt stress. Taken together, it was concluded that the ability of proline in mitigating salt stress-induced damages was correlated with the changes in nitrogen assimilation activities.
机译：已经证明盐度是有助于植物中氮氮可用性的主要因素。为了验证受脯氨酸外源性施用的氮代谢活性的变化，其与耐盐性的关系，在体外水稻芽中用作研究生长性能和两个马来西亚氮同化活动的变化水稻品种Mr 220和253333。结果表明，盐胁迫大大降低了植物高度，射击硝酸盐（NO 3）含量，射击谷氨酰胺合成酶（GS）和两种品种的根硝酸还原酶（NR）活性。脯氨酸的补充显着增加了植物高度，根部的植物高度，根部数量，根部NO3含量，根本NR和根GS活性在MR 253中的盐胁迫下的盐胁迫下比220更大的增强。结果还表明，253先生拥有更高与所有测试治疗中的亚硝酸盐还原酶（NIR）和谷氨酸合成酶（NADH-GOGAT）活性相比。有人建议，NO3-内容，NR和GS活动在调节盐胁迫下调节氮代谢的重要作用。总之，它的结论是，脯氨酸在减轻盐应激诱导的损伤中的能力与氮同化活性的变化相关。

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