Font Size: a A A

Studies On Effects Of Some Halophytes Under Salt Stress

Posted on:2005-08-31Degree:MasterType:Thesis
Country:ChinaCandidate:D J MaFull Text:PDF
GTID:2120360125459227Subject:Botany
Abstract/Summary:PDF Full Text Request
Salicornia europaea L.,Kalidium foliatum Pall.,Suaeda altissima L.Pall. and Suaeda crassifolia Pall. are succulent euhalophytes which belong to Chenopodisceae. In this essay ,by mean of culturing with nutritional solution of different salt concentration (NaCl, mmol/L), and investigated the salt tolerance of four halophytes in two aspects of microstructure and physiological indexes. The results of research could supply some information for establishing estimate indexes of salt tolerance of plants in order to filtrating resources of halophytes of Xinjiang and empoldering saline soil.The stems and leaves of four halophytes had the characteristics as follows: The stems and leaves of S.europaea and K.foliatum were fleshy, the leaves of S.altissima and S.crassifolia were succulent, and cuticle cells of S.europaea had thick keratose layer which propitious to reducing water evaporation,the keratose layer of cuticle cells of others was thin. Except S. europaea, epidermal cells of the stems and leaves of other three kinds of plants were arranged compactly. The volumes of Parenchyma cells of these plants were big, and they became bigger along with the increasing of NaCl concentration. Big vacuole of Palisade tissue cells improving their abilities of absorbing and keeping water, except K.foliatum.The results of physiological indexes analysis under different salt stress condition showed that cell membrane permeability(MP) of all species increased along with the increasing of NaCl concentration, and concentrations of Na+, Cl-, proline, soluble sugar (SS), saccharose and malondialdehyde(MDA) showed the same tendency. When the stress intensity extended, proline(Pro) concentrations of S.altissima and S.crassifolia were increased rapidly ,and became obviously higher than that in S.europaea and K.foliatum ; concentrations of Na+ and Cl- in S.europaea were the highest in four species; concentrations of chlorophyll(CHl), K+, Ca2+and Mg2+, and the K+/ Na+ rate of four species decreased as the stress intensity extended, so do the peroxidase(POD), Superoxide dismutase(SOD) and Catalase(CAT) activity of four species. CAT activity of S.altissima and S.crassifolia were increased firstly, and then decreased as the stress intensity extended, CAT activity reached its ultimate value at the NaCl concentration of 50mmol/L. CHl a/CHl b value kept stable when salt stress increased; fleshy of four halophytes were increased firstly, and then gave a decreasing tendency when stress intensity extended; fleshy was higher in the fittest range of growing. Polyacrylamide gel electrophoresis (PAGE) of POD showed that component of POD could be influenced by the stress intensity extended.Through correlation analysis about physiological indexes, the results showed: MP increase was extremely significantly positive correlation with the concentrations of MDA, Na+ and Cl-. MP increase was accompanied by the decrease of CAT, POD, SOD activities and concentrations of K+,Ca2+,Mg2+, and there were significant or extremely significant negative correlation among them. There were positive correlation, significant or extremely significant positive correlation among concentrations of SS, saccharose, Pro, Na+ and Cl-.
Keywords/Search Tags:halophyte, salt stress, microstructure, physiological index, correlation
PDF Full Text Request
Related items