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高氯酸钾浸种对水稻种子萌发及幼苗生理特性的影响
陶功胜,田雪瑶,谢寅峰,陈倩,时蕾
0
(南京林业大学森林资源与环境学院,南京 210037; 桐城师范高等专科学校理工系,桐城 231400)
摘要:
以水稻为实验材料,在水培及控制条件下,探讨不同浓度(0、20、50、100和300 mg·L-1)的高氯酸钾浸种胁迫对水稻种子萌发及幼苗生长生理的影响。结果表明,低浓度胁迫(20 mg·L-1)对种子萌发有一定的刺激作用,萌发率、根长和根数均大于对照,随着胁迫浓度和时间的增加,种子萌发及幼苗生长受抑制程度逐渐增大,并且茎的生长比根受影响程度更大。与对照相比,幼苗叶片叶绿素、蛋白质和MDA含量均随胁迫浓度的增高而下降,而SOD活性呈先升后降的趋势,POD活性持续增强,CAT则明显下降。综合各指标的变化及相关性分析结果表明,高氯酸钾抑制水稻种子萌发及导致的幼苗生理伤害与活性氧代谢失调有关,其伤害机制尚待进一步探讨。
关键词:  水稻  高氯酸钾胁迫  种子萌发  生理特性
DOI:10.13610/j.cnki.1672-352x.20140620.018
基金项目:江苏高校优势学科建设工程项目(PAPD)和南京林业大学科技创新项目(CX2011-23)共同资助。
Effects of KClO4 solution on seed germination and seedling physiological characteristcs in rice
TAO Gongsheng,TIAN Xueyao,XIE Yinfeng,CHEN Qian,SHI Lei
( College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037; Department of Science and Technology, Tongcheng Teachers College, Tongcheng 231400)
Abstract:
Rice (Oryza sativa L.) seed was treated with different concentrations (0, 20, 50, 100 and 300 mg·L-1) of KClO4 solution.Seed germination, growth and physiological characteristcs of seedling under hydroponic and controlled conditions were determined. The results showed that low concentration (20 mg·L-1) of KClO4 treatment stimulated seed germination with a higher germination index, root length and root number of seedlings than those of the control (CK). With an increase of KClO4 concentration and treatment time, seed germination and seedling growth were gradually inhibited, and such an inhibition effect of KClO4 was greater on stems than on the roots of seedlings. With an increase of KClO4 concentration, chlorophyll content, soluble protein and MDA content, CAT activity decreased. The POD activity increased. The SOD activity increased first, then decreased in seedling leaves compared to the control. The results of correlation analysis between different indexes suggested that the inhibition of seed germination and physiological damage of rice seedling under KClO4 stress might be related to disturbance of active oxygen metabolism in KClO4-treated seeds and seedlings. The damage mechanism caused by KClO4 need to be further studied.
Key words:  Oryza sativa L.  KClO4 stress  seed germination  physiological characteristcs

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