Salt response of the freshwater microalga Scenedesmus obliquus(Turp.)Kutz is modulated by the algal growth phase
Salt response of the freshwater microalga Scenedesmus obliquus(Turp.) Kutz is modulated by the algal growth phase作者机构:Department of Botany and MicrobiologyFaculty of ScienceDamietta UniversityNew Damietta City 34517Egypt
出 版 物:《Journal of Oceanology and Limnology》 (海洋湖沼学报(英文))
年 卷 期:2020年第38卷第3期
页 面:802-815页
核心收录:
学科分类:0710[理学-生物学] 0908[农学-水产] 0707[理学-海洋科学] 09[农学] 0815[工学-水利工程] 0903[农学-农业资源与环境]
主 题:carbohydrates growth phase minerals protein salt stress Scenedesmus obliquus
摘 要:Growth and biochemical responses of the coenobial green alga Scenedesmus obliquus to salinity stress were monitored across different phases of *** alga was cultured on BG11 growth medium and subjected to 0,30,100,and 200 mmol/L NaCl for a period of 20 d,during which algal cultures were harvested at 4-d *** salinity-induced inhibition of algal growth was accompanied with prolongation of timing of the different growth *** sharp and progressive salinity-induced inhibition of algal growth rate during the early phase of growth points to salt shock but moderation of inhibition at the subsequent stages of growth means algal acclimation to *** concentrations of chlorophylls a and b,soluble sugars,proteins as well as those of K+and Na+in the alga exhibited peaks at the initiation of the exponential phase of growth,with increasing magnitude in proportion to the increase in the level of ***,whereas soluble sugars of the alga peaked at initiation of the exponential phase,starch concentration progressively increased with culture age,reaching saturation towards the stationary *** the salinity-induced increase in soluble sugars was most evident at the early stages of growth the reverse was true for *** present results point to fast acclimation of *** to salt stress post a brief salt shock,utilizing soluble sugars,K+and Na+for osmotic *** salinity from 0 to 200 mmol/L NaCl led to progressive increase in soluble sugars,proteins,K+and Na+concentrations of the algal cells,particularly at the early stages of ***,the salinity-induced increase in chlorophyll concentration approached a limit at 100 mmol/L NaCl whereas that in starch concentration was more evident at the later stages of growth.