八棱海棠耐盐碱性评价

为探明八棱海棠的耐盐碱性种质资源价值,以实生苗为试材,采用水培的方法评价了八棱海棠耐盐性和耐碱性.结果表明:1)0.4％ NaCI处理30 d时,八棱海棠的盐害指数为51.1,根据耐盐性评价标准判定为中等耐盐型树种；其实生个体间存在广泛的抗性分离现象,极强、强、中、弱和极弱耐盐型植株分别占群体总数的20.6％、23.9％、37.0％、12.0％和6.5％.2)pH9.5碱处理(Na2CO3)30 d时,八棱海棠的碱害指数为16.3,根据耐碱性评价标准判定为极强耐碱型树种；其实生个体间存在广泛的抗性分离现象,极强、强、中、弱和极弱耐碱型植株分别占群体总数的79.1％、15.3％、4.2％、1.4％和0％.八棱海棠中存在极强耐盐型和极强耐碱型植株,是优异的耐盐/碱型种质资源树种.

Evaluation on the resistance of Malus robusta Rehdto alkalinity and salinity

Using the seedlings of Malus robusta Rehd,injury index and water culture as experimental materials,the resistance of Malus robusta Rehd to alkalinity and salinity was studied.The results showed that the salinity injury index of Malus robusta Rehd was 51.1 in the stress of 0.4% NaCl in 30 days.According to the evaluation standard of salinity resistance level,Malus robusta Rehd was medium resistance to salinity.The population of Malus robusta Rehd were widely separated.As for the plants of the salinity tolerance,the corresponding percentages of extremely highly resistance,highly resistance,medium resistance,low resistance and extremely low resistance were 20.6%,23.9%,37.0%,12.0% and 6.5% respectively.The alkalinity injury index of Malus robusta Rehd was 16.3 in the stress of pH 9.5 in 30 days.According to the evaluation standard of resistance level,Malus robusta Rehd was extremely highly resistance to alkalinity.The population of Malus robusta Rehd were widely separated.As for the plants of the alkalinity tolerance,the corresponding percentages of extremely highly resistance,highly resistance,medium resistance,low resistance and extremely low resistance were 79.1%,15.3%,4.2%,1.4% and 0% respectively. Malus robusta Rehd is a type of tree species with excellent salinity/alkalinity tolerance.