结缕草属草坪草种质资源的耐盐性评价

摘要

Salinity tolerance in 103 Zoysia accessions from seven species was assessed in hydroponic culture containing 20 g/L NaCL The relative green leaf coverage and relative dry shoot clipping weight showed that there were differences in salinity tolerance between accessions. Using relative green leaf coverage as an indicator, there were 28 and 46 accessions with more salinity tolerance than ' manilagrass' and Zoysia japonica 'Lanyin No. 3', respectively. When compared by relative dry shoot clipping weight, there were 11 and 25 accessions with more salinity tolerance than 'manilagrass' and Z. japonica 'Lanyin No. 3', respectively. Z. pacifica was the most salinity tolerant species, Z. macrostachya, Z. matrella, and Z. tenuifolia had strong salinity tolerance, while Z. sinica, Z. japonica and Z. koreana were intermediate or sensitive. Clustering analysis of relative green leaf coverage and relative dry shoot clipping weight, indicated that the 103 Zoysia accessions could be divided into three groups; group I (including Z5185 and Z093) was extremely saline tolerant; group II had comparatively higher relative green leaf coverages and relative dry shoot clipping weights 070%). It could be further divided into salinity tolerance and intermediate salinity tolerance; group III had comparatively low relative green leaf coverage and relative dry shoot clipping weight, and could be divided into weak and sensitive salinity tolerance at a Euclidean distance of 3.%以相对绿叶盖度和相对枝叶修剪干重为指标,通过水培法系统地对7种103份结缕草属种质资源用20 g/LNaCl进行耐盐性评价.结果表明,供试材料间的耐盐性差异很大.以相对绿叶盖度进行比较,比‘马尼拉’和‘兰引3号’强的材料各有28份和46份；以相对枝叶修剪干重为指标,比‘马尼拉’和‘兰引3号’强的材料各有11份和25份.供试材料种间耐盐性最强的为太平洋结缕草,大穗结缕草、沟叶结缕草和细叶结缕草的耐盐性也较强,中华结缕草、结缕草和朝鲜结缕草的耐盐性中等或较弱.以相对绿叶盖度和相对枝叶修剪干重为指标对103份结缕草属种质资源进行聚类分析,将103份结缕草属种质资源分成三大类,其中Ⅰ类为极耐盐类型,包括Z5185和Z093两份材料；Ⅱ类的相对绿叶盖度和相对枝叶修剪干重的平均值均较高(＞70％),进一步分为耐盐、中等耐盐2类；Ⅲ类相对绿叶盖度和相对枝叶修剪干重的平均值较低,在欧式距离3处将Ⅲ类分为弱耐盐、盐敏感2类.