Abstract Few species can survive well in both salty and non-salty soils (i.e., the habitat-indifferent halophytes). Little is known about the impact of soil salinity in different habitats on salt tolerance during seed germination. This study assesses effects of seed provenance of Salsola drummondii, a habitat-indifferent halophyte, on the individual effects and interactions between salt tolerance, photoperiod and thermoperiod on final germination, germination rate index (GRI) and recovery of germination from salt solutions. Seeds collected from plants grown in salty and non-salty soils were germinated in six salt solutions and incubated at three thermoperiod and two photoperiod regimes. Seeds were able to germinate and recover their germination in up to 1000 mM NaCl. Seeds from plants of non-salty soils germinated significantly better in up to 800 mM than those from salty soils, but the reverse was true at 1000 mM. The increase in salinity did not significantly affect GRI. Germination recovery was greater for seeds of plants from non-salty than for those from salty soils and for seeds germinated at lower than at higher thermoperiods. GRI of germination recovery increased with the increase in salinity level and was significantly higher for seeds of non-salty than of salty soils. Despite seeds of the two habitats are able to disperse to each other’s habitat, they differed in dormancy, GRI, and response to photoperiod and thermoperiod. Such difference could be considered the physiological basis for environmental cues that determine the proper space and time of germination that help in successful seedling establishment.

中文翻译：

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种子来源影响干旱阿拉伯沙漠中无生境 Salsola dialmondii 盐生植物的耐盐性和萌发反应

摘要 很少有物种能够在咸土和非咸土（即与生境无关的盐生植物）中都能很好地生存。关于不同栖息地土壤盐分对种子萌发过程中耐盐性的影响知之甚少。本研究评估了对栖息地无关的盐生植物 Salsola dialmondii 的种子来源对耐盐性、光周期和热周期之间的个体效应和相互作用对最终发芽、发芽率指数 (GRI) 和盐溶液发芽恢复的影响。从生长在咸和非咸土壤中的植物收集的种子在六种盐溶液中发芽，并在三个热周期和两个光周期条件下培养。种子能够在高达 1000 mM NaCl 中发芽和恢复发芽。来自非咸土壤植物的种子在高达 800 mM 的情况下发芽明显优于来自咸土壤的种子，但在 1000 mM 时则相反。盐度的增加没有显着影响 GRI。来自非咸性土壤的植物种子的萌发恢复率高于来自咸性土壤的植物种子，以及在较低温度下发芽的种子比在较高温度周期下发芽的种子发芽率更高。发芽恢复的 GRI 随着盐度水平的增加而增加，并且非咸性种子的 GRI 显着高于咸性土壤。尽管这两个栖息地的种子能够分散到彼此的栖息地，但它们在休眠、GRI 以及对光周期和热周期的响应方面存在差异。