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以冬小麦(Triticum aestivum)临远077038为材料,研究了施入外源Ca2+对150、200、250及350mmol·L-1NaCl胁迫下小麦种子萌发及幼苗生长发育的影响。结果表明:20mmol·L-1CaCl2浸种能够提高小麦在150-250mmol·L-1盐胁迫下种子的发芽率,并能增强其生长势;当NaCl浓度为350mmol·L-1时,小麦种子不能萌发,且在以上浓度的NaCl胁迫下,小麦种子均不能发育成苗。对NaCl胁迫下的小麦幼苗施入外源Ca2+后,提高了幼苗膜稳定性,降低了膜脂过氧化程度,从而减轻了盐胁迫对幼苗膜的伤害,表现为电导率降低、MDA含量降低及SOD和POD活性提高,并且提高了幼苗的呼吸强度及叶绿素含量,促进了幼苗生长及生物量的积累;Ca2+的缓解效应随着盐胁迫的加剧逐渐减弱,在浓度为350mmol·L-1的盐胁迫下,幼苗的生物量显著低于对照。以上结果表明,与水处理相比,20mmol·L-1CaCl2处理能够更大程度地促进小麦的生长发育。
Triticum aestivum Linyuan 077038 was used to study the effects of exogenous Ca2 + on seed germination and seedling growth of wheat under 150, 200, 250 and 350 mmol·L-1 NaCl stress. The results showed that the soaking of 20 mmol·L-1 CaCl2 could increase the germination rate of wheat under 150-250 mmol·L-1 salt stress and increase its growth potential. When NaCl concentration was 350 mmol·L-1, the seed germination , And under the above concentration of NaCl stress, wheat seeds can not develop into seedlings. The application of exogenous Ca2 + to wheat seedling under NaCl stress increased the stability of seedling membrane, decreased the lipid peroxidation, reduced the damage of salt stress on the seedling membrane, and decreased the conductivity and MDA content SOD and POD activity increased, and the respiration rate and chlorophyll content of seedlings increased, which promoted seedling growth and biomass accumulation. The alleviating effect of Ca2 + gradually weakened with salt stress. Under the salt concentration of 350 mmol·L-1 Under stress, the biomass of seedlings was significantly lower than that of the control. The above results show that compared with water treatment, 20mmol·L-1CaCl2 treatment can promote the growth and development of wheat to a greater extent.