盐胁迫对牧草种子萌发及其恢复的影响

The effect of saline condition on the germination and its recovery of pasture species

观察了7 种牧草种子在8 个NaCl浓度:0(0 Mpa),21(-0.1 Mpa),66(-0.3 Mpa),110(-0.5 Mpa),150(-0.70 Mpa),200(-0.9 Mpa),267(-1.2 Mpa),334(-1.95 Mpa),445(-2.603Mpa) m m ol/L下的发芽率及胚根和胚芽的生长,将盐胁迫下未萌发种子移入营养液中,观测它们在解除盐胁迫后发芽率、胚根和胚芽生长的恢复情况。结果表明,盐胁迫下,随盐浓度的增加,种子的发芽率呈下降趋势,但长穗偃麦草的发芽率几乎不受盐胁迫的影响,总体上它的胚芽和胚根长度随渗透势的降低而减少。21 m m ol/L的盐浓度对不同种的胚芽和胚根有不同的刺激作用。解除盐胁迫后,种子发芽率随原浓度的增加而增加,445 m m ol/L的高浓度对所有种的胚芽和胚根恢复生长最有利。因此,短时间,尤其是高浓度下的盐分锻炼,对种子的发芽及胚根和胚芽的生长有促进作用,但促进的幅度因种而异。生产实践中可用盐锻炼促进种子的发芽率,提高建植效果。

Seven pasture species seeds were geminated in NaCl concentration of 0, 21, 66, 110, 155, 200, 267, 343, 445 mmol/L and un germinated seeds were then removed to Hoagland solution for germinating. The results indicated that all species’s germination rate decreased with the increasing of NaCl concentration under NaCl stress, except for Elytrigia elongatus. 21 mmol/L NaCl stimulated the growth of radical and shoot. Recovery germination rate in Hoagland solution increased with the increase of pre treatment NaCl concentration. The radical and shoot growth takes advantage in high salinity pretreatment. It concluded that short period with high concentration salt training would stimulate the germination as well as radical and shoot growth.