草地早熟禾不同品种苗期耐盐性鉴定

为了发掘和利用具有优良耐盐性状的草地早熟禾种质资源，对其14个品种种质资源苗期耐盐性进行初步研究。通过测定不同浓度NaCl胁迫下各品种的耐盐系数，利用主成份分析和隶属函数对草地早熟禾的耐盐性进行综合评价。结果表明：在 0、0.3%、0.6%、0.9%和 1.2% NaCl胁迫下，筛出适宜草地早熟禾苗期耐盐性鉴定的NaCl浓度为0.6%；相对发芽率、相对活力指数、相对根系平均直径等8个指标与早熟禾耐盐性密切相关。经主成分分析得出，前3个主成分累积贡献率达84.263%，综合指标的权重依次为：0.616、0.216和0.168，根据综合评价Ｄ值，对草地早熟禾不同品种的耐盐性进行排名，得出：耐盐性较好的品种有‘蓝天鹅’、‘优异白’、‘蓝狐’、‘肯塔基’和‘优美’，有望成为滨海地区的优势种。

Validation of Different Varieties of Kentucky Bluegrass in Seeding Stage

In order to explore and make use of the germ plasm resource of the Poa pratensis featuring good salt tolerance, the pilot study on the salt tolerance of the germ plasm resource of 14 varieties in the seedling stage has been carried out. The salt tolerance of the Kentucky bluegrass has been evaluated in a comprehensive manner through measuring the salt tolerance coefficient of different varieties under the stress of NaCl of different concentrations and by means of the principal component analysis and the membership function. The results indicate that when the concentration of NaCl is 0.6% rather than 0,0.3%, 0.9% and1.2%, the evaluation of salt tolerance is suitable for the Poa pratensis; eight indexes such as the relative germination rate, the relative vigor index and the average diameter of the relative root system is closely related to the salt tolerance of the Kentucky bluegrass. According to the principal component analysis, the contribution rate of the first three principal components had added up to 84.263% and their proportions in terms of the overall indicators are 0.616, 0.216 and 0.168 respectively. According to the D-Value of comprehensive assessment, the salt tolerance of the Kentucky bluegrass of different varieties has been ranked, and there are several varieties featuring good salt tolerance including ‘Blue Swan’, ‘Merit’, ‘Blue fox’, ‘Kentucky’ and ‘Euromyth’, which are expected to become the dominant species in the coastal region.