半红树植物杨叶肖槿幼苗耐盐性研究

温室内对半红树植物杨叶肖槿幼苗进行7个盐度(5、8、11、14、17、20、23 g·kg-1)的胁迫处理,并对各处理下杨叶肖槿的生长量、生物量、生理指标和光合速率进行测定,结合生理指标进行适应度分析.结果表明:杨叶肖槿的苗高、地径、叶片数、根、茎、叶干质量及总生物量随着盐度的上升均呈下降趋势,在盐度为5、8 g·kg...

Salt Tolerance of Semi-mangrove Plant Thespesia populnea Seedlings

Thespesia populnea seedlings were treated with seven salt gradients including 5, 8, 11, 14, 17, 20, and 23 g·kg^-1 in greenhouse. The increment, biomass, physiological indexes and photosynthetic rate of Thespesia populnea seedlings with different salinity treatments were determined, combined with the adaptability analysis of physiological indexes. The results showed that the height, stem, leaf, root dry weight, stem dry weight, leaf dry weight and total biomass decreased with increasing of the salt, and they kept high values when the treatment salt were 5 and 8 g·kg^-1, but they decreased suddenly when the treatment salt were more than 11 g·kg^-1. The photosynthesis of Thespesia populnea seedlings were high under the salt treatment of 5, 8 and 11 g·kg^-1, and the maximum value was under the salt treatment of 8 g·kg^-1.With the increasing of salinity, the SOD, free proline and MDA increased, but chlorophyll, chlorophyll A and root activity decreased. The adaptability analysis of physiological indicator showed that Thespesia populnea seedlings grew normally when the treatment salt was no more than 8 g·kg^-1, and the growth would be inhibited when the salinity was more than 11 g·kg^-1.