盐胁迫对野生稻种子萌发及幼苗生长的影响

以3个野生稻品种(系)和常规稻品种吉粳301(CK)为试验材料,研究了不同NaCl浓度对野生稻种子萌发及幼苗生长的影响。结果表明,盐胁迫对野生稻和常规粳稻种子萌发及幼苗生长的影响不同,NaCl浓度≤0.3%时,盐胁迫对3个野生稻种子发芽及幼苗生长没有影响,但促进吉粳301种子发芽及幼苗生长;NaCl浓度≥0.5%时,随着NaCl浓度的增大,3个野生稻种子发芽率逐渐降低,幼苗的根长、苗长、根冠比逐渐变小;NaCl浓度与3个野生稻种子发芽率有一定的负相关性;NaCl对野生稻幼苗根的抑制作用强于对苗的作用;不同野生稻品种对NaCl溶液的耐受能力不同,从大到小依次为MY-3、延引红、HY-1。

Effects of Salt Stress on Seed Germination and Seedling Growth of Different Wild Rice

The effects of different concentrations of NaCl on seed germination and seedling growth of wild rice were studied with 3 wild rice varieties(series) and conventional rice variety Jigeng 301(CK). The results showed that the effects of low concentration of salt stress on seed germination and seedling growth of wild rice and conventional japonica rice was different. When the concentration of NaCl≤0.3%, the effects of salt stress on seed germination and seedling growth of wild rice were little, but it improved the seed ger-mination and seedling growth of Jigeng 301;when the concentration of NaCl≥0.5%, with the increase of NaCl concentration, the ger-mination rate, length of root, the height of seedling, root/shoot ratio of wild rice were decreased; the concentration of NaCl had a neg-ative correlation with the germination rate of wild rice; the inhibitory effect of NaCl on the root of wild rice seedling was stronger than that of seedlings; different wild rice varieties had different tolerance to NaCl solution, from big to small, which is MY-3, Yanyinhong, HY-1.