温度和盐分胁迫对野生大豆种子萌发的影响

Effects of Salinity and Temperature on Seed Germination and Seedling Growth of Glycine Soja

研究了不同NaCl浓度(0,25,50,100,200 mmol·L-1)、温度(10/15℃、15/20℃、20/25℃、25/30℃)对野生大豆种子萌发的影响。结果表明:野生大豆种子在蒸馏水中温度周期为10/15℃,15/20℃,20/25℃,25/30℃时种子萌发率均达到96%以上,最适的萌发温度周期为25/30℃,此时种子萌发迅速,且发芽率、发芽指数及活力指数均最高;温度一定时,适当的盐浓度会促进种子萌发;随着盐浓度的增加,幼苗生长量呈现下降的趋势。

Seed germination and embryo growth of Glycine soja were studied under five levels of salinity（0,25,50,100,200 mmol· L^-1 ） stress and four temperature regimes（ 10/15℃, 15/20℃ ,20/25℃ ,25/30℃ ）. The germination rate of Glycine soja seeds could reach above 96% in a wide range of thermoperiod treatments of 10/15℃, 15/20℃ ,20/25℃ ,25/30℃, the opti- mal temperature for germination was 25/30℃ in distilled water. The seed of Glycine soja were adapted well to high temperature and germinated rapidly at 25/30℃. Its germination percentage, germination index and vigor index were increased with the tem-perature rose. At certain temperature, appropriate salinity could promote seed germination,with the increase of NaCl concentra-tion, seeding growth decreased.