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PEG-6000模拟干旱胁迫对黄秋葵种子萌发和幼苗生理特性的影响
王继玥1, 石登红1, 白禹2, 杨丹1, 张婷2, 刘燕1
1.贵阳学院生物与环境工程学院, 贵阳 550005;2.贵州省山地珍稀动物与经济昆虫重点实验室, 贵阳 550005
摘要:  为了解黄秋葵(Abelmoschus esculentus)对干旱胁迫的应答机制,采用PEG-6000溶液模拟干旱胁迫,对‘纤指’和‘红秋葵’品种的种子萌发和幼苗的生理特性进行研究。结果表明,两品种的种子吸水率、发芽势、发芽率、发芽指数、活力指数、简易活力指数,幼苗下胚轴长、根长、苗鲜重和苗干重均随PEG-6000浓度的增加呈下降的趋势,旱害率则不断增加。PEG-6000浓度为20%时,两品种的种子均未能发芽。幼苗的SOD、POD和CAT活性和可溶性蛋白、可溶性糖、游离脯氨酸、丙二醛含量随PEG-6000浓度的增加而增加,且均PEG-6000浓度为15%时最高。因此,干旱胁迫会抑制黄秋葵种子的萌发,提高细胞内含物的含量,同时引发其抗氧化系统的响应。
关键词:  黄秋葵  干旱胁迫  种子  生理特性
DOI:10.11926/jtsb.3907
分类号:
基金项目:国家自然科学基金青年项目(31600442);国家级大学生创新创业训练项目(2018109760007,2018109760008);贵州省区域内一流培育建设学科项目(黔教科研发[2017]85号);贵州省科技计划项目(黔科合基础[2017]1004);贵州省教育厅创新群体重大研究项目(黔教合KY字[2018]027);生态学省级重点学科项目(黔学位合字ZDXK[2013]08);江苏省农业科技自主创新基金项目[CX(12)5071]资助
Effect of Drought Stress with PEG-6000 on Seed Germination and Physiological Properties in Abelmoschus esculentus
WANG Ji-yue1, SHI Deng-hong1, BAI Yu2, YANG Dan1, ZHANG Ting2, LIU Yan1
1.School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China;2.Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region, Guiyang 550005, China
Abstract:  To understand the response mechanism of okra (Abelmoschus esculentus) under drought stress, PEG-6000 solution was used to simulate drought stress, the seed germination and physiological traits of seedlings in ‘Qianzhi’ and ‘Red okra’ varieties were studied. The results showed that the water absorption, germination energy, germination rate, germination index, vigor index, simple vigor index of seeds, and hypocotyl length, root length, fresh weight and dry weight of seedlings in two varieties decreased with the concentration of PEG-6000 solution increased, while the drought-injury rate of okra increased. The seeds of two varieties failed to germinate with 20% PEG-6000. The activities of SOD, POD and CAT, and the contents of proline (Pro), soluble protein, soluble sugar and malonaldehyde (MDA) of okra seedlings increased with the concentration of PEG-6000 solution increased, and they reached up to maximum under 15% PEG-6000. So, it was suggested that under drought stress, seed germination of A. esculentus was inhibited, the contents of cell inclusion enhanced, and the antioxidant system was stimulated.
Key words:  Abelmoschus esculentus  Drought stress  Seed  Physiological property

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