镉对不同种源树番茄种子萌发及幼苗生长的影响

Effect of cadmium on seed germination characteristics and seeding growth of Cyphomandra betacea from different seed sources

研究不同种源树番茄种子萌发及幼苗生长对镉添加的响应,探讨不同种源树番茄对镉的耐受能力,以期筛选耐镉性较强的优良种源。以5个树番茄种源XS、PE、DH、BS、LC种子为试材,采用单因素完全随机试验设计,设置5个镉浓度(土壤含镉量w计:0、5、10、20、50 mg·kg^(-1))水平,观测不同种源树番茄种子萌发及幼苗生长情况。结果表明,XS种源发芽率、发芽指数和活力指数在5 mg·kg^(-1)Cd^(2+)处理时有促进作用,BS种源发芽势、发芽指数和活力指数在5 mg·kg^(-1)Cd^(2+)处理时有促进作用,LC种源发芽势和活力指数均在5 mg·kg^(-1)Cd^(2+)处理时有促进作用。随Cd^(2+)浓度的升高,XS、PE、BS和LC种源幼苗的根长、苗高和鲜质量均受到抑制,5 mg·kg^(-1)的镉处理对各种源的叶长起促进作用,10~50 mg·kg^(-1)显著抑制PE和DH的根长、XS和BS的苗高、PE的叶长和鲜质量。5个不同种源的树番茄对Cd^(2+)的耐受能力不同,隶属函数结果为LC对Cd^(2+)的耐受性最强。

We investigated the response of seed germination and seedling growth of Cyphomandra betacea from different seed sources to cadmium addition,and explored the cadmium tolerance of C.betacea from different seed sources,in order to screen out good seed sources with better cadmium tolerance.The seeds of five C.betacea seeds XS,PE,DH,BS,and LC were used as test materials,and five Cd concentrations(soil Cd content:0,5,10,20,and 50 mg·kg^(-1))were set in a one-way completely randomized experimental design to observe the seed germination and seedling growth of different seeds of C.betacea.The results show that:Seed germination indexes were promoted at 5 mg·kg^(-1)for XS seed source,germination potential,germination index and vigor index for BS seed source,and germination potential,germination index and vigor index for LC seed source,all at 5 mg·kg^(-1).With increasing Cd^(2+)concentration,root length,seedling height and fresh weight of seedlings of XS,PE,BS and LC species were inhibited.5 mg·kg^(-1)of Cd treatment promoted leaf length of various sources,and 10-50 mg·kg^(-1)significantly inhibited root length of PR and DH,seedling height of XS and BS,and leaf length and fresh weight of PR.C.beracea from five different seed sources differed in their tolerance to Cd^(2+),and the affiliation function resulted in the best tolerance of LC to Cd^(2+).