低盐对可口革囊星虫成活率、生理指标及组织变化的影响

AbstractIn order to investigate the response mechanism of Phasolosmaesculenta to low salinity,the control group was natural seawater.Themortality rate of Phasolosma esculenta under low salinity stress wasstudied,as well as the concentration of Na+,K+and Cl-in the bodycavity fluid and the physiological and histological changes of intestinaland body wall tissues under Oh,3h,6h,12h,24h and 48h stress.Theresults showed that with the decrease of salinity from 10ppt to 5ppt,themortality rate of dendrosaceae was gradually increased.Under theaction of a salinity of 10ppt,the concentrations of Na+,K+and Cl-instarworm blood decreased rapidly and then remained at a certain value.The activity of Na+/K+-atpase (NKP)and ACP in intestinal wall andbody wall reached a peak at 6h and 12h respectively,and then stabilizedat a level slightly higher than that in the control group.Under salt stress,the connective tissue cells of the intestine and body walls become largeand loose.The results showed that the enzyme system and non-enzymesystem changed under low salt stress,which provided some clues toreveal the mechanism of reaction under low salt stress.Keywords:Phasolosma esculenta;salinity;stress;coelomic fluid