摘要
以20℃/3、6、8、11、14、17℃(昼/夜)温度对两片真叶期黄瓜幼苗进行锻炼,结果表明,经锻炼的幼苗,在低温胁迫中萎蔫开始时间推迟,胁迫后叶片组织电解质外渗减少,冷害症状轻微,光合作用恢复迅速。综合分析结果,11℃以下的低温锻炼对提高黄瓜幼苗耐冷性作用明显,6℃为最佳锻炼温度。在此条件下,黄瓜幼苗经6天后便获得最大耐冷性。 低温锻炼过程中,黄瓜幼苗叶片含水量下降,但束缚水比例升高,气孔阻力及可溶性糖含量基本上随锻炼进程而增加;叶片中叶绿素含量也由于锻炼而发生变化。
Cucumber (Cucumis sativus L.) seedlings at the two-true leaf stage were acclimated at temperatures of 20℃ day and 3 , 6 , 8 , 11, 14, 17℃ night for 7 days.
There were less electrolyte leakages, less chilling injurys, delayed leaf wilt and higher photosynthetic rates after 40 hours exposure at 1-2℃ in acclimated cucumber seedlings than that in nonacclimated ones. In the present study, the acclimation at 3-11℃ was effective in protecting seedlings from chilling injury. The optimum acclimating temperature was 6℃. The maximum level of chilling tolerance was reached after 6 days acclimation at 6℃ in young cucumber plants.
After cold acclimation water content decreased, but the proportion of bound water increased, while soluble sugar and stomatal resistance rose. Chlorophyll content also changed during acclimation in cucumber plants.
出处
《园艺学报》
CAS
CSCD
北大核心
1992年第1期61-66,共6页
Acta Horticulturae Sinica
基金
国家自然科学基金资助项目
关键词
耐寒性
低温
黄瓜
Cold tolerance
Cold acclimation
Cucumber
