摘要
旨在探讨黄瓜幼苗对NaCl胁迫的生理响应,为黄瓜生产提供科学依据。本研究采用向1/2 Hoagland营养液中按一定比例添加中性盐(NaCl)模拟盐胁迫的方式,调查了NaCl胁迫对黄瓜幼苗生长的影响。结果表明:(1)NaCl胁迫下,黄瓜幼苗的株高、叶面积、地上部分鲜重、总根数、总根长及根系鲜重均呈下降趋势,除地上部分鲜重外,其余均随NaCl浓度的增加而明显下降。(2)NaCl胁迫下,黄瓜幼苗的叶绿素含量明显提高,但随NaCl浓度的增加叶绿素含量呈下降态势。(3)NaCl胁迫能明显降低黄瓜幼苗根苗SOD、POD、CAT活性,且地下部分SOD与CAT酶活性下降幅度大于地上部分。(4)黄瓜根苗的MDA含量随NaCl有胁迫浓度的增加而明显增加。(5)盐胁迫下,由于黄瓜幼苗根苗的抗氧化酶活性下降,从而使其膜质过氧化加重,最终导致其根苗生长受到明显的抑制。
The aims were to explore the physiological response of NaCl on the cucumber seedling, and provide the scientific evidence of the cucumber production. An experiment using NaCl to induce 1/2 Hoagland water stresses was carried out to evaluate the effect of NaCl on root and seedling growth of cucumber bean. The result showed that： （1） NaCl stress decreased plant height, leaf area, aerial parts of the fresh weight, total root number, total root length and root fresh weight of cucumber seedling. With the NaCl stress increasing, all of them decreased except the aerial parts of fresh weight. （2） The chlorophyll content of cucumber seedling increased remarkably under the NaCl stress. （3） The NaCl stress reduces the activity of cucumber seedling roots’ SOD, POD and CAT. In addition the decrease range of SOD and CAT on enzyme activity of under ground portion was more than that of aerial portion. （4） The MAD content of cucumber seedling was obviously increasing due to the increasing of NaCl stress concentration. （5） As the declining of antioxidase activity of cucumber seedling roots, the membrance lipid peroxidation was enhanced, this ultimately led to the inhibition of growth of cucumber seedling root significantly.
出处
《中国农学通报》
CSCD
2013年第22期178-182,共5页
Chinese Agricultural Science Bulletin
基金
国家自然基金资助项目"黄土高原旱薄地区黍稷抗旱耐瘠根土系统研究"(30871483/C1303)
关键词
NACL胁迫
黄瓜
幼苗
生理响应
NaCl stress
cucumber
seedlings
physiological responses
