5个白蜡无性系耐盐性及对NaCI胁迫的生理响应

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Abstract：To studythediferences insalt toleranceamongdiferentash（Fraxinuschinensis）clones insalineandalkaline land，thisstudyusesgraftedseedlingsoffiveclones （EuropeanAsh-ompact，EuropeanAsh-Open-62，-6，and Yuanla 2）as test materials.This study simulates salt stressenvironments with NaCl solutions at diferent concentrations [1‰ （2号 （CK）， 3‰ ， 5‰ and 7‰ ]，determines growth indicators，physiological and biochemical indicators and evaluates their salt tolerance.Theresultsshow that withtheincreasing NaClconcentration，therelative growthrateof all fiveashclones decreasesgradually，while biomass increases initiallybut decreasessubsequently.Theosmoticregulating substances like soluble sugar，solubleproteinandfreeprolinegraduallyinerease.Thechlorophyllcontent first increasesand thendecreases， reaching the maximum at 3‰ NaCl.The activity of superoxide dismutase （SOD） increases gradually，while the activity of peroxidase （POD） first increases and then decreases. The Na+/K+ ratio increases extremely significantly.With the extension of stresstime，thecontents ofosmoticregulating substances—soluble sugars，soluble proteinsand free proline—increase significantly （P<0.05） .Theactivities of SOD and POD enzymes first increase and then decrease，while the chlorophyll contentdecreases extremelysignificantly.Compared totheother fourashclones，clone12-76exhibitsthehighestrelative sedling height growthrate，relative grounddiameter increaserate，totalbiomass，andactivitiesofSODandPODenzymes， andthelwest malondialdehyde （MDA）content.Acomprehensiveevaluationof the growth，physiological，andbiochemical indicators of different F. chinensis clones using the fuzzy membership function method shows that the salt tolerance ranking is： 12-76> Yuanla 2> European Ash Compact > European Ash - Open > Clone 12-62.

Keywords： Fraxinus chinensis; clones; physiological indicators; salt tolerance; comprehensive evaluation

黄河三角洲资源丰富，位置优越，在世界河口湿地生态系统中极具代表性，具有提高生物多样性和改善环境等重大作用[]，作为我国最后的待开发河流三角洲，该地区生态资源的开发利用已成为国家战略[2]。（剩余14380字）