摘要
高温是制约黄瓜生产的重要非生物胁迫因子之一。黄瓜(Cucumis sativus L.)嫁接苗能够有效缓解高温胁迫危害,但目前黄瓜嫁接砧木品种并不多。为此,本研究收集了国内外48份砧用南瓜种质,对萌发期和幼苗期进行高温处理(38℃和42℃),通过UPGMA聚类分析,鉴定其耐热性,并筛选适宜的形态指标。共测定了10个性状(发芽率、发芽势、发芽指数、活力指数、株高、茎粗、全株鲜重、全株干重、壮苗指数、热害指数)指标。结果表明,48份砧用南瓜种质耐热性在萌发期及幼苗期都可以分为4类。在2个时期皆表现出较耐高温的种质为日本绿霸和日本强力士;对高温敏感的种质有11份。种子相对发芽势、相对发芽指数、相对活力指数以及幼苗相对干重可作为砧用南瓜种质资源耐热性鉴定的可靠指标。
The rising global temperature has posed serious threat to the production of cucumber.Although cucumber grafted seedlings can reduce high temperature stress,there are not enough rootstocks of cucumber.In a search for thermotolerace and morphological indexes,we collected 48 specimen rootstock-used pumpkins from different regions.Those germplasms were treated with high temperatures（38℃ and 42℃） at germination and seedling stages,respectively,and screened for thermotolerance using UPGMA cluster analysis.Ten indexes（i.e.,germination rate,germination potential,germination index,vigor index at germination stage,plant height,stem thickness,fresh biomass,dry biomass,seedling index and heat injury index at seedling stage） were evaluated.The results showed that the thermotolerance of 48 accessions of rootstock-used pumpkin germplasm could be divided into 4 types at germination stage and seedling stage.In both development stages there were 2 moderately heat susceptible cultivars（samples Lvba and Qiang Lishi from Japan） and 11 heat sensitive cultivars.The relative value of germination potential,germination index,vigor index,dry biomass were credible indexes for identification.
出处
《植物遗传资源学报》
CAS
CSCD
北大核心
2014年第6期1239-1247,共9页
Journal of Plant Genetic Resources
基金
现代农业产业技术体系建设专项资金资助(CARS-25-C-03)
江苏省农业三新工程项目(SXGC[2013]331)
关键词
砧用南瓜
耐热性
种质
形态指标
rootstock-used pumpkin
thermotolerance
germplasm
morphological index
