红光暗期多点打断对黄瓜和番茄幼苗生长发育及光合特性的影响  

Effects of red light night multi-break on growth and photosynthetic characteristics of cucumber and tomato seedlings

作　　者：佘新[1] 杨振超[1] 曹凯[1] 丁娟娟[1] 耿凤展[1] 许红军[1] 钟辉丽[1] 

机构地区：[1]西北农林科技大学园艺学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2013年第5期121-126,共6页Journal of Northwest A&F University(Natural Science Edition)

基　　金：陕西省科技统筹创新工程计划项目"温室工程与环境综合调控与节能新技术集成"(2011KTDZ02-03-02)

摘　　要：【目的】探讨红光暗期多点打断对黄瓜、番茄幼苗生长发育及光合特性的影响,为生产上通过光形态调控来培育壮苗提供理论依据。【方法】于20℃下采用新型LED光源的50μmol/(m2.s)红光在黄瓜、番茄幼苗生长暗期(18:00-08:00)每2h照射5min,每个生长暗期照7次,研究红光暗期多点打断处理对黄瓜和番茄幼苗生长发育、叶绿素含量及光合特性的影响。【结果】红光暗期多点打断处理抑制了黄瓜和番茄幼苗的下胚轴长、株高、节间长度和叶面积的生长,壮苗指数较对照分别提高了42.4%和24.2%;同时影响了干物质在地上部位的分配,黄瓜和番茄幼苗干物质在叶片的分配率均有不同程度提高,但有机物向茎的运输和分配显著减少。红光暗期多点打断提高了番茄幼苗的光合速率,降低了黄瓜幼苗的光合速率。【结论】利用红光暗期多点打断,可抑制黄瓜和番茄幼苗的徒长,提高幼苗的壮苗指数。【Objective】 The effects on growth and photosynthetic characteristics of cucumber and tomato seedlings were investigated with red light night multi-break to improve seedling cultivation through photomorphogenesis.【Method】 Cucumber and tomato seedlings were irradiated with 50 μmol/（m2·s）red light from light emitting diodes（LED） for 5 min every 2 h,7 times every dark period（18：00-08：00）at the temperature of 20℃.The effects on growth,chlorophyll content,photosynthesis of cucumber and tomato seedlings were discussed.【Result】 The growth of hypocotyls length,plant height,length of internode and leaf area of cucumber and tomato seedlings were inhibited,while their health indexes were improved by 42.4% and 24.2% compared to contrast,respectively.The dry matter distributed on the ground parts was changed,and the partitioning ratio of dry matter in leaf was improved by different degrees,while organic matter transported and distributed to stem was reduced significantly.The photosynthesis rate of tomato seedlings was higher than that of contrast while cucumber seedlings had lower rate than contrast.【Conclusion】 The excessive growth of cucumber and tomato seedlings can be restrained to increase healthy index by red light night multi-break.

关 键 词：LED红光 黄瓜 番茄 壮苗指数 光合特性 

分 类 号：S642.243[农业科学—蔬菜学] S641.243[农业科学—园艺学]