不同菜心品种耐热性鉴定指标的筛选

研究了6个不同熟性的菜心品种在高温塑料棚中苗期和采收期对农艺性状(株高(PH)、开展度(Width)、基叶数(BLN)、薹叶数(SSLN)、叶片长度(LL)、叶柄长(PL)、叶宽(LW)、叶柄宽(PW)、叶厚(LT)、薹高(SSH)、薹粗(SSD)、薹重(SSW)、总重(TW)和播种成活率(SR))和生理生化(丙二醛(MDA)、脯氨酸(Pro)、电导率(EC)、叶绿素(Ch))等指标变化的影响,并以菜心热害指数为性状筛选标准,采用隶属函数法对相关数据进行了分析。结果表明:4项指标与热害指数显著负相关并可以用来鉴定菜心的耐热性,即高温塑料棚采收期的菜心株高(HT-PH)、薹叶数(HT-SSLN)、采收期的单株生物总重(HT-TW)和播种成活率(HT-SR)。6个菜心材料的耐热性可以分为3类:"四九-19号菜心"和"四九黄菜心"为耐热型;"油绿50d菜心"和"油绿501菜心"为一般耐热型;"油绿菜心701"和"特青迟心4号"为热敏型。

Screening of Assessment Indexes on Heat Tolerance in Different Chinese Flowering Cabbage Cultivars

The effects of high temperature stress on agronomic characters about plant height(PH),width,base leaf No.(BLN),seed stalk leaf No.(SSLN),leaf length(LL),petiole length(PL),leaf width(LW),petiole width(PW),leaf thickness(LT),seed stalk height(SSH),seed stalk diameter(SSD),seed stalk weight(SSW),total weight(TW),survival rate(SR) and physiological biochemical character about malon dialdehyde(MDA) content,proline(Pro) content,electric conductivity(EC),chlorophyll(Ch) content during Chinese flowering cabbages seedling stage and harvesting time in heat stress plastic shelter were investigated in 6 cultivars.The significantly related indicators were screened with the heat injury by the membership function method.The results showed that 4 indexes,were significant negative correlation with the heat injury index,could be used to identify the heat resistance of Chinese flowering cabbages.It included the HT-PH,HT-SSLN,HT-TW and HT-SR in heat stress plastic shelter during the cultivars harvesting time.The heat tolerance of the tested 6 cultivars could be divided into three types.The ’Sijiu-19caixin’ and ’Sijiuhuangcaixin’ were heat resistant type,’Youlv50tiancaixin’ and ’Youlv501caixin’ were general heat tolerance,’Youlv701caixin’ and ’Teqingchixin4’ were heat-sensitive.