西瓜种质资源抗旱性苗期筛选与评价

Evaluation of Drought Resistance for Watermelon Germplasm Collections at Seedling Stage

采用苗期持续干旱法,对1066份西瓜种质资源开展大规模抗旱性筛选评价。结果表明,不同基因型种质资源抗旱性差异明显。采用快速聚类方法将供试材料分为抗旱、耐旱、敏感和抗性分离等4种类型,共获得25份强抗旱性西瓜材料,多为来源于非洲的野生西瓜种质资源,适用于西瓜嫁接砧木的选育;获得30份中等抗旱性材料,多为栽培种西瓜种质资源,具有农艺性状优良、抗病性强等优点,可直接用于抗旱节水西瓜新品种选育。

1066 watermelon accessions were screened for drought resistance under progressive drying condition at seedling stage.The result indicated that the suffered degree was significantly different among accessions.Using fast cluster analysis,1066 collections were devided into 4 classes,which were resistant,middle resistant,susceptible and resistance seperation,respectively.25 accessions were identified as high resistant to drought,while 30 collections were middle resistance.Most of high resistant accessions were wild germplasm from Africa,which were suitable for watermelon rootstock breeding.Those middle resistant germplasms were almost cultivar accessions,which have good agriculture traits and disease resistance and could be used as watermelon drought resistance breeding.