结缕草属植物的抗旱性初步评价

以目前生产上广泛应用的‘兰引3号’结缕草、‘青岛结缕草’和马尼拉为对照,对48份结缕草种源的表征永久萎蔫系数(APWI)进行了测定并分析,结果如下:1)各种源的APWI的变异范围为8.7 8%~1 3.4 1%,变异系数为9.10%。在48份供试种源中,APWI显著低于‘兰引3号’结缕草的有6份种源;APWI显著低于马尼拉的有2份种源;APWI显著低于‘青岛结缕草’的有15份种源;APWI同时显著低于3份对照的有2份种源。结缕草属植物的APWI存在极显著的差异。2)结缕草属植物不同种的APWI不同,其排序为:中华结缕草>大穗结缕草>结缕草>沟叶结缕草=细叶结缕草,其中变异系数最大为结缕草。3)APWI在结缕草、中华结缕草种内存在着极显著的差异,且结缕草种内抗旱性差异明显高于中华结缕草种内差异。4)结缕草属植物的APWI与经度和纬度均未发现显著相关;结缕草、中华结缕草种内的APWI与经纬度也未发现显著的线性相关。

Assessment of drought resistance of Zoysia

The apparent permanent wilting index(APWI)of 48 accessions of Zoysia.were studied using Zoysia japonica cv.Lanyin No.3,Z. japonica cv.Qingdao and Manila(Z.matrella) as the checks.The results showed that: 1) The variation in range of APWI of 51 accessions was 8.78%-13.41%, with a 9.10% coefficient of variation.There were 6 accessions whose APWI was significantly lower than that of 'Lanyin No.3';2 accessions significantly lower than that of Manila;15 accessions significantly lower than that of 'Qingdao',and 2 accessions significantly lower than that of the 3 checks.Highly significant differences existed among the APWI of the 51 accessions.2)The APWI of five species were ranked as: Z.sinica >Z.macrostaycha >Z.japonica >Z.matrella =Z.tenuifolia,in which the largest coefficient of variation was in accessions of Z.japonica.3) There were obvious differences of APWI in accessions of Z.japonica and Z.sinica.The variance of drought resistance of Z.japonica was higher than that of Z.sinica.4) There was no significant linear correlation between the latitude or longitude of collection sites and the APWI of accessions of Zoysia or of Z.sinica and Z.japonica.