盐胁迫对4个品种豇豆种子萌发的影响

Study on the Characteristics of Seed Germination of Four Cowpea(Vigna unguiculata) Varieties Under Salt Stress

以4个品种豇豆(Vigna unguiculata)种子为材料,研究了盐胁迫对豇豆种子萌发的影响。用不同浓度的NaCl溶液进行处理,分析了不同品种豇豆种子的萌发情况,对比了4种豇豆种子的相对发芽率、相对发芽指数和相对盐害指数等指标。结果表明:在盐胁迫条件下,随着盐浓度的增加,不同豇豆品种对盐胁迫的反应有所不同;各品种豇豆种子对低盐胁迫(≤25 mmol/L)有一定的适应性,低盐浓度对发芽率影响较小,但对种子的发芽指数影响较大;盐胁迫对4个品种的盐害指数随着盐浓度的增加而增大,较高浓度的盐胁迫对4种豇豆种子的萌发和生长有较强的抑制作用;在50 mmol/L的盐胁迫下,穗丰9号的盐害指数极显著地低于其它3个品种(p<0.01),而夏美1号的盐害指数高于其它品种(p<0.05)。通过各项指标对4种豇豆种子进行综合评价,耐盐能力最强的品种为穗丰9号油青豆角,穗丰5号油白豆角和穗丰8号油青豆角次之,夏美1号白豆角耐盐能力最弱。

The effects of salt stress on the seed germination of four cowpea （Vigna unguiculata） varieties （Xiamei 1,Suifeng 5,Suifeng 8 and Suifeng 9） were investigated.Seeds were treated in different concentration of NaCl,and the germination percentage,germination index and salt injury index of the four varieties were compared.The results showed that：Compared with the control,under the condition of NaCl salt stress,different seed varieties had different salt stress reaction.Low concentrations salt stress （≤25 mmol/L） affected weakly to the relative germination rate of all varieties of cowpea seeds but has stronger impact on relative seed germination index.The relative salt injury rate increased with the increasing of salt concentration.Seed germination and seedling growth of the four varieties was strongly inhibited by 50 mmol/L of salt stress.Comprehensive evaluation of the four varieties indicated that Suifeng 9 had better salt tolerance than other three varieties,Suifeng 5 and Suifeng 8 were inferior,and Xiamei 1 was the most susceptible variety.