关键词: 黄瓜, 种质资源, 耐低温性, 评价

Abstract:

Taking 43 cucumber varieties（ lines） of different types as experimental material，this paper put
the cucumber seedling under chilling stress（ day/night temperatures are 12 ℃ /9 ℃），and carried out evaluation
on low temperature tolerance with cold injury index as identification indicator. Eventually，7 varieties with
low temperature tolerance，10 varieties with low temperature sensitiveness were identified. The correlation
analysis was carried out on cucumber cold injury index（ Y） after low temperature treatment，the declined rate
of chlorophyll（ X₁） and the increased rates of soluble protein（X₂），MDA（X₃），proline（X₄）and POD
（X₅）. Then a regression equation for identifying cucumber low temperature tolerance was established：
Y=0.433+0.671X₁+0.005X₂+0.121X₃-0.733X₄+0. 248X₅

Key words: Cucumber, Germplasm, Low temperature