混合碱胁迫对碱茅和紫花苜蓿种子萌发的影响

Effect of Mixed Salt-alkaline Stress on Seed Germination of Puccinellia distans and Medicago sativa L.

采用室内种子萌发试验方法,以碱茅(Puccinellia distans),紫花苜蓿(Medicago sativa L.)两种牧草种子为研究对象,以NaHCO_3和Na_2CO_3为基础盐分,将NaHCO_3和Na_2CO_3按照1:0、2:1、1:1、1:2、1:1的比例配成相同浓度的复合溶液,研究不同混合盐分胁迫对碱茅和紫花苜蓿种子发芽率、发芽势、发芽指数、芽长和芽重的影响。结果表明:不同比例的混合盐分胁迫对碱茅和苜蓿种子的发芽率、发芽势、发芽指数和芽长均有明显地抑制作用。但是,不同盐分组合处理间对碱茅和紫花苜蓿的芽重的影响比单一盐分要小。单一盐分比较,NaHCO_3的抑制作用更强。NaHCO_3和Na_2CO_3的比例为1:1时,对两种种子的发芽抑制作用最强。两种牧草比较,Na_2CO_3和NaHCO_3混合盐分胁迫对碱茅种子萌发的抑制作用较弱,对紫花苜蓿种子萌发的抑制作用较强。

The effects of two saline-alkaloid（NaHCO3,Na2CO3） and their mixed solutions（1：0、2：1、1：1、1：2、1：1） on Puccinellia distans and Medicago sativa L.seed germination rate,germination potential,germinationindex,bud length and bud weight were studied by indoor experiments.The results showed that the germinationrate,germination potential,germination index and bud length were obviously inhibited by the mixed saline-alkaloid solutions,but the effect of mixed saline-alkaloid solutions on bud weight was smaller than that ofsingle saline-alkaloid treatment.The inhibiting effect of NaHCO3 was higher than that of Na2CO3,and when themixed ratio of the two saline-alkaloid was 1：1,the inhibiting effect was the highest.The mixed saline-alkaloidstress had poor inhibition on Puccinellia distans seed germination,but strong inhibition on Medicago sativa L.seed germination.