闽楠叶片响应干旱胁迫的蛋白质组分析
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福建省科学技术厅引导性项目 (2016N0001);


Proteome Analysis of Phoebe bournei Leaves in Response to Drought Stress
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    摘要:

    闽楠对土壤水分要求较高,为了提高闽楠造林的成活率,该研究以正常供水为对照,测定了不同干旱胁迫时间(7 d、 14 d)及复水后7 d的叶片蛋白质组及生理生化指标变化,以探讨闽楠响应干旱胁迫的分子生理机制。结果表明:(1)不同干旱胁迫处理下闽楠叶片蛋白质双向电泳(2DE)分析结果共发现51 个差异表达蛋白;采用 MALDITOF/TOF成功鉴定到45个蛋白点;这些鉴定出的差异蛋白与光合作用、碳水化合物和能量代谢、胁迫响应与防御、翻译后修饰、蛋白质转换与分子伴侣功能等生理代谢过程密切相关。(2)检测不同干旱处理时间闽楠叶片膜脂过氧化相关MDA含量,防御相关酶SOD、CAT、 POD活性和糖代谢相关酶PFK、AGPase、PK及PDH活性,发现各指标在14 d持续干旱胁迫时主要呈下降趋势,且变化均达到极显著水平(P<0.01)。研究认为,持续干旱胁迫下,光合作用和植物防御系统以及能量和糖代谢的降低是闽楠不耐干旱的重要生理生化原因,研究结果为今后耐旱闽楠的分子育种提供了理论依据。

    Abstract:

    Phoebe bournei (Hemsl.) Yang requires higher soil moisture, in order to improve the survival rate of afforestation.The aim of this research was to investigate the drought tolerant of the P. bournei. The experiment was conducted to determine the changes of proteome, and physiological and biochemical indexes of P. bournei under different drought stress durations (7 d, 14 d drought treatments and 7 d after rewatering restoration) to reveal the molecular mechanism. Results showed that: (1) fiftyone differentially expressed proteins were founded in the P. bournei leaves by using twodimensional electrophoresis (2DE) under different drought stresses. Fortyfive differentially expressed proteins were successfully identified by MALDITOF/TOF. These identified differential proteins are closely related to some processes of physiological metabolism, including photosynthesis, carbohydrate and energy metabolism, stress response and defense, posttranslational modifications, protein conversion and molecular chaperone functions. (2) At the same time, we found that the main trend of the content of MDA involved in membrane lipid peroxidation, the activities of SOD, CAT, POD associated with defense, and the activities of PFK, AGPase, PK and the content of PDH related to sugar metabolism were declined and significantly changed (P<0.01) in the leaves of P. bournei under 14 d continued drought stress. Reduced photosynthesis,plant defense systems,as well as energy and sugar metabolism under drought stress may be the physiological and biochemical reasons that the species was not a drought tolerant plant. The present study provided a theoretical basis for the molecular breeding of droughttolerant P. bournei in the future.

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卢 思,张 哲,刘 丹,等.闽楠叶片响应干旱胁迫的蛋白质组分析[J].西北植物学报,2019,39(2):258-267

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  • 在线发布日期: 2019-03-22
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