摘要
探讨外源水杨酸(SA)对盐胁迫下菜豆种子萌发和幼苗生理特性的影响。用不同浓度SA处理NaCl盐胁迫下的菜豆种子,测量种子萌发、幼苗生长及生理指标。结果表明,7 g·L-1NaCl处理后,显著降低菜豆种子的发芽势、发芽率、发芽指数以及幼苗的主根长和芽长,也显著降低幼苗的SOD活性、提高MDA含量。在盐胁迫下,随SA浓度的增加,菜豆种子发芽势、发芽率、发芽指数以及幼苗的主根长、芽长、侧根数和SOD活性均呈现先升后降的趋势,且以0.5 g·L-1SA达最大值,而幼苗的MDA含量呈现先降后升的趋势,以0.5 g·L-1SA达最小值。由此可知,NaCl盐胁迫抑制菜豆种子萌发和幼苗生长,而添加适宜浓度的SA能缓解盐胁迫作用,且以0.5 g·L-1SA效果最好。
The research was carried out to study the effects of exogenous salicylic acid （SA） on seed germination and seedling physiological characteristics of kidney bean （Phaseolus vulgaris L.） under salt stress. Different concentrations of SA solution were used in NaCI-salt stressed seeds of kidney bean. Seed germination index, seedling growth index and physiological index were measured. The results showed that 7 g. L-1 NaCI significantly reduced the germination potential, germination rate and germination index of kidney bean seeds, the root length and stem length of kidney bean seedling, and also the SOD activity, but improved seedlings MDA content. Under salt stress, along with the increasing of the SA concentration, the germination potential, germination rate, germination index,seedling＇s main root length, shoot length, lateral root number and SOD activity showed the trend of increase first and then decrease with the peak at 0.5 g · L-1 SA, but the MDA content of seedlings decreased first and then increased with the lowest at 0.5 g. L-1 SA. NaCI salt stress depressed the seed germination and seedling growth of kidney bean, and SA could alleviate salt stress, and 0.5 g·L-1 SA was the best concentration.
出处
《东北农业大学学报》
CAS
CSCD
北大核心
2013年第10期39-43,共5页
Journal of Northeast Agricultural University
基金
湖北省豆类(蔬菜)植物工程技术研究中心开放基金(2012-01)
关键词
菜豆
盐胁迫
水杨酸
种子萌发
生理特性
kidney bean
salt stress
salicylic acid
seed germination
physiological characteristic
