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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 kinds of forage seeds were observed under the conditions of 8 NaCl concentrations 0 (0 Mpa), 21 (-0.1 Mpa), 66 (-0.3 Mpa), 110 (-0.5 Mpa), 150 (-0.70 Mpa), 200 Mpa), 267 (-1.2 Mpa), 334 (-1.95 Mpa), 445 (-2.603 Mpa) mm ol / L and the growth of radicle and germ. The non-germinated seeds under salt stress were transferred into the nutrient solution The germination rate, the recovery of radicle and embryo growth after salt stress relief were observed. The results showed that under salt stress, the seed germination rate decreased with the increase of salt concentration, but the germination rate of Agropyron elongatum was hardly affected by salt stress. In general, the germination and radicle length varied with osmotic potential Reduce and reduce. Salt concentrations of 21 m mol / L have different stimulating effects on germs and radicles of different species. After salt stress was relieved, the seed germination rate increased with the increase of the original concentration. The high concentration of 445 m mol / L was most favorable to all kinds of embryos and radicles. Therefore, salt stress training in a short period of time, especially in high concentration, can promote seed germination and radicle and germ growth, but the extent of promotion varies from species to species. Salt production practice can promote seed germination rate, improve the planting effect.