温度和盐分对两种盐爪爪属植物种子萌发的影响

通过研究温度和NaCl对两种藜科叶肉质化盐生植物——里海盐爪爪和盐爪爪种子萌发的影响,显示出里海盐爪爪的最适萌发温度范围为20~30℃,而盐爪爪适合在变温条件下萌发,两者对温度的反应有显著差异;两者的萌发率和萌发速率都随NaCl浓度升高而降低,里海盐爪爪比盐爪爪的耐盐能力低;高盐分条件能诱导两个种的休眠,而当盐浓度降低时两者都能很好地恢复萌发,且萌发速率加快。因此,尽管里海盐爪爪仅能在低于300mmol/L,盐爪爪在低于400mmol//LNaCl浓度下萌发,这种耐盐能力低于很多盐生植物,但根据两个种所表现的综合萌发特性,它们依然被认为属于具有较高耐盐能力的盐生植物类型.图3表1参24

Effect of Temperature and Salinity on Germination of Two Kalidium Species (Chenopodiaceae)

The effects of temperature and NaCl on germination of two leaf-succulent halophytes Kalidium capsicum and K. foliatum (Chenopodiaceae) were tested. Growth chamber studies revealed that there was a significant difference in optimum temperature range for seed germination of the two species. For K. capsicum, the optimum temperature range was between 20～30 ℃. The germination percentage of K. foliatum was higher at alternating temperature. The final germination percentage and germination rate of the both species decreased as NaCl concentration increased. K. capsicum was less tolerant to salinity than K.foliatum. Hypersaline conditions could induce dormancy. The percentage of germination recovery for the both species by NaCl treatments was not significantly different from the controls and the germination rate was enhanced when salinity stress was alleviated. Although K. capsicum only germinated at less than 300 mmol/L NaCl concentration and K. foliatum at less than 400 mmol/L, which were lower than some other halophytes did at, the both species seemed to be highly tolerant to salinity stress due to their germination characteristics. Fig 3, Tab 1, Ref 24