甘薯全生育期耐盐种质筛选与耐盐性评价

Evaluation and Screening for Salt-tolerant Sweetpotato Accessions during Growth Period

将200份甘薯材料同时种植在江苏省盐城市盐渍试验田和培肥地,通过比较这些材料在盐渍地和培肥地苗期成活率、单株结薯数、单株产量、商品薯率、薯块干物率等产量和品质指标,对这些甘薯材料进行全生育期的耐盐性综合鉴定。结果表明,在盐渍条件下,大部分甘薯材料的单株结薯数增加,而苗期成活率、单株产量、商品薯率和薯块干物率降低。相关性分析结果显示,甘薯的耐盐指数与苗期相对成活率和单株产量、单株结薯数、商品薯率的耐盐系数呈极显著正相关,而与薯块干物率呈显著负相关。根据耐盐指数的高低将参试材料的耐盐性进行分级,共筛选出19份耐盐性较强的甘薯材料,为之后甘薯的耐盐机理研究和耐盐育种提供了材料基础。

Total 200 sweetpotato accessions were planted in the saline field and fertile land in Yancheng City, Jiangsu Province. By comparing the yield and quality index, such as seeding survival rate, number of storage roots per plant, yield per plant, commodity potato rate and dry matter content of storage roots, a comprehensive identifica- tion for salt-tolerance in the lifecycle of these sweetpotato materials was carried out. The results showed that the number of storage roots increased, but survival rate of seedling plants, yield per plant, commodity potato rate and dry matter content of storage roots decreased. The salt-tolerance index was positively correlated with the survival rate of seedling plants and the salt-tolerance coefficient of number of storage roots per plant, yield per plant and commodity potato rate, but negatively correlated with the salt-tolerance coefficient of dry matter content of storage roots. 19 salt- tolerant sweetpotato materials were screened out based on the salt-tolerance index. Thus, this study may provide the germplasm resource potentially valuable in works of analyzing salt-tolerance mechanism and breeding for salt-toler- ance sweetpotato.