补光时间及光质对黄瓜幼苗生长及根系活力的影响  

Effects of Supplemental Light Quality and Durations of Illumination on Growth and Root Activity of Cucumber Seedling

作　　者：闫晓花[1] 郁继华[1] 颉建明[1] 

机构地区：[1]甘肃农业大学园艺学院,甘肃兰州730070

出　　处：《核农学报》2016年第6期1211-1217,共7页Journal of Nuclear Agricultural Sciences

基　　金：国家现代农业产业技术体系建设资金项目(CARS-25-C-07)

摘　　要：为了明确温室黄瓜幼苗生长及根系活力对补光时间及光质的响应,本研究分析了补光时间(2、4和8h)及光质[红蓝复合光(R∶B=7∶3,R∶B=8∶2)、蓝光(B)、红光(R)和白光(W)]对黄瓜幼苗地上部形态、根系形态、根系活力及干物质积累的影响。结果表明,补光时间及光质对黄瓜幼苗株高、茎粗、根长、根表面积、根分枝数、根系活力及地上部干重和壮苗指数影响显著,且互作效应显著。补光4h后黄瓜的各项生长指标均优于补光2、8h和不补光(CK);补照红蓝复合光处理后黄瓜的各项生长指标均优于补照蓝光、红光、白光和CK。其中,补照4h红蓝复合光(7∶3)处理下黄瓜幼苗株高、茎粗、根长、根表面积、根分枝数和根系活力最高,黄瓜幼苗地上部干重和根干重分别显著高于补照2h蓝、红、白光,补照8h的蓝、红、白光及CK。黄瓜幼苗地上部干重、根干重均与根系活力呈显著正相关关系。说明通过补充4h红蓝复合光(7∶3)可显著提高根系活力,进而有效促进黄瓜幼苗干物质的积累,为培育壮苗奠定了生理基础。The objective of this study was to evaluate the effect of supplemental light quality and durations of illumination on growth and root activity of cucumber （Cucumis sativus L. ） seedling. The experiment was conducted to study the effect of three supplemental light duration （2, 4, and 8 h） and six light qualities ： white light （W）, red light （ R）, blue light （B） , a 7：3 mixture of R and B, and a 8：2 mixture of R and B on the state of aboveground seedling and belowground root, root activity and biomass accumulation of cucumber. The result showed that the light duration and light quality had significant effects on seedling height, root diameter, root length, root surface area, root branch numbers, root activity, shoot dry weight （DW） , root DW and seedling index as well as the duration and quality interaction. Growth indexes of cucumber with 4 h supplemental light were significantly higher than that treated with 2 or 8 h supplemental light. Light quality with mixture of R and B had higher growth indexes than with B, R, W and natural light. The treatment with supplemental light duration of 4 h and light quality in 7：3 mixture of R and B had the highest seedling height, stem diameter, root length, root surface area, root branch numbers, and root activity. In addition, the shoot and root DW were significantly improved over treatment with supplemental duration of 2 h and light quality in B, R, W and with supplemental duration of 8 h and light quality in B, R, W and in natural light. Shoot dry weight and root dry weight showed a positive relationship with root activity, respectively. It was conclude that providing 4 h of supplemental light （in 7：3 mixture of R and B） could promote the root activity of cucumber and thereby increase the shoot and root DW. The study laid a physical foundation of sound seedling cultivation.

关 键 词：LED 根系形态 根系活力 壮苗指数 

分 类 号：S642.2[农业科学—蔬菜学]