为揭示新疆草原主要毒草醉马草对水分胁迫的适应机制,采用常规纸上发芽法探讨了不同PEG浓度(质量/体积百分比为0％,5％、10％、15％)对其种子萌发特性的影响.结果表明:低浓度PEG(5％～10％)可促进醉马草种子发芽,而高浓度PEG(15％)则抑制其发芽势、发芽指数、活力指数、胚芽长,促进胚根的生长;PEG胁迫下不同来源的醉马草种子发芽率、发芽势、发芽指数间差异显著(P＜0.05),且中低海拔区域(1650～1832 m)的醉马草抗旱性高于高海拔区域(2287 m).
Effect of Water Stress Simulated by PEG on Seed Germination of Achnatherum inebriants (Hance) Keng
Achnatherum inebriants is the main poisonous weed in Xinjiang pasture.In order to reveal its adaptive mechanism of water stress,the effect on seed germination of A.inebriants under different PEG concentration (the percentage of mass and volume was 0％,5％,10％,15％) was studied with the paper germination method.The results showed that the germination rate of A.inebriants was improved under low PEG concentration from 5％ to 10％,the germination energy,germination index,vitality index and germ length of A.inebriants were decreased under high PEG concentration of 15％,but the radical length was increased.There was significant difference on germination rate,germination energy,germination index of different A.inebriants under PEG stress (P＜0.05),and its drought resistance of low-middle elevation from 1650 m to 1832 m was higher than that of high elevation of 2287 m.
NETL
NSTL
万方数据
维普
