黃瓜耐濕冷性苗期濕冷害指數(shù)鑒定方法的建立

打開文本圖片集

Establishing of a wet-cold tolerant identification method for cucumber during seedling stage by wet-cold injury index

DING Yuanyuan，LIU Hanqiang，PAN Yupeng，MENG Huanwen， CHENG Zhihui （CollegeofHorticulture，NorthwestA&FUivesity，Yangling7oo，haniina）

Abstract： To establish a wet-cold tolerant identification method during seedling stage for cucumber by morphology，the seedlings intwodevelopedtrue leavesof8testcultivarsand5validationcultivars withdiferent wet-coldtolerance were treatedunder 9°C/5°C（day/night）+ relative humidity 95% growth chambers（taking 25°C/18°C +relative humidity 85% asthecontrol）.After7daysof treatment，thedegreeof wet-cold injurywascountedforeach plant，the wet-coldinjuryindexes were calculatedand the growth parameter were measured.The results showed thatthe diferent cultivars presented diferentlevelofleafyellowing，waterlosing wiltingordeath underwet-coldstressandthe wet-coldinjuryindexes could indicate the wet-cold toleranceofthecultivaraccurately.Theresultsofvalidation testwereconsistent withthoseofmethodestablishment test.Theclusteringofwet-cold toleranceofvarious varietiesbasedontherelativevaluesofplantheight， leaf lengthand leaf width etc.under wet-cold stress and controlcondition wereconsistent with theclasificationof wet-coldinjuryindex.Therefore，itisthoughtthatthewet-coldinjuryindexatseedlingstagecanbeusedtoidentifythe wet-coldtoleranceofcucumber cultivars.The wet-cold injury index greater thanObutlessthanorequal to0.250 ndicatesstrong toleranttype，greaterthanO.250butlessthanorequalto0.550indicatesmoderate toleranttype，greaterthan 0.550 butless thanorequalto0.750indicates weak tolerant type，andgreaterthan0.750butlessthanorequalto1.00 indicates sensitive type.

Keywords：Cucumber;Cultivargermplasm; Wet-coldtolerance;Wet-cold injuryindex;Identificationmethodatsedling stage

黃瓜是典型的喜溫蔬菜，生長發(fā)育適宜溫度為15～32°C ，對低溫敏感， 10～12°C 生長緩慢或停止，5°C 可致冷害；也不耐高溫， 35°C 和 40°C 以上常分別導(dǎo)致生殖和生長障礙。（剩余8341字）