盐胁迫对不同基因型甘薯光合、酶活和生物学特性的影响

摘要

通过对徐薯22、徐508、徐薯25、徐薯18、商薯19等5个不同基因型甘薯品种的盐胁迫研究,表明在盐胁迫下不同基因型甘薯品种的产量和干率均有所下降,产量的下降幅度在22.87％ ～ 56.35％,干率的下降幅度在2.33％～7.2％；当用20％盐水浇灌时,所有品种均不能生长.对盐胁迫后甘薯叶绿素含量测定结果表明,盐胁迫对甘薯苗期影响较大,但对甘薯中期和后期影响不大；对POD活性测定结果表明,甘薯品种在受到盐胁迫时,多数品种的POD活性是不升高的,甘薯品种对盐胁迫有自我保护.从品种的耐受度、产量、POD活性值等多因素结果表明,徐薯22和徐薯18对盐有较好的耐受性.%We studied 5 genotypes of sweetpotato with salt stress, including Xushu22, Xu508, Xushu25, Xushul8 ,Shangshul9. The result indicated that the yield and dry rates decreased under salt stress,and the decline range was 22.87% -56. 35% and 2.33% -7.2% respectively, and all genotypes could not grow under salt stress with 20% saline water. The study of chlorophyll content in response to salt stress showed that the impact of salt stress was greater on the seeding period than the mid and late period of growth. The test of POD activity with salt stress showed that the POD activity of most genotypes were not elevated, and sweet potato was self-protection to salt stress. Based on the salt tolerance,the yield and he POD activity,the results showed that Xushu 22 and Xushul8 were higher salt tolerance than other genotypes.