Effect of climate on the salt tolerance of two Phragmites australis populations.

摘要: Abstract This study estimated the effects of Danish (temperate nemoral) and Spanish (mediterranean) climatic conditions on salt tolerance two Phragmites australis (Cav.) Trin. ex Steud. populations. Plants propagated from seeds collected in Denmark (=Danish population) Spain (=Spanish were exposed to salinity levels ranging 0 30‰ at outdoor experimental plots situated (56°N) (41°N). measured for growth rate, mortality, below-ground/above-ground ratio, water content, ash nitrogen C:N ions (K + , Na Mg 2+ Ca Cl − ). Growth was significantly enhanced site, especially 10 20‰. In this interval, rates both population 20–100% higher than site. These data point site when using relative absolute as criteria. Salt is ascribed important mechanisms, cation adjustment loss. Despite transpiration plants able maintain or improve K /Na ratios leaf laminas, indicating under conditions. Primarily, due accumulation (305–378 mmol kg −1 ) compared (220–268 mmol kg ), while a effect level only evident population. Climatically induced differences content may also have contributed observed Shoot lower (1.9–2.4 g g DW) (2.6–4.0 g DW), suggesting that loss an mechanism contributing osmotic adjustment. Water act by concentrating solutes cell sap, thereby reducing need synthesis metabolically expensive organic osmotica well uptake showed P. populations differ tolerance. A relatively related ratio below-ground parts discussed relation partitioning.