农业环境科学学报2017，Vol.36Issue(1)：32-38,7.DOI:10.11654/jaes.2016-1048
DA-6对水培生菜生长及生理特性的影响
Effects of DA-6 on growth and physiological characteristics in hydroponic lettuce
摘要
Abstract
DA-6 is a broad-spectrum and high-efficiency plant growth regulator,which has high biological activity and low toxicity. Effects of five DA-6 concentrations(0,20,100,500,1000μg·L-1)on lettuce growth and physiological characteristics were investigated by hydro-ponic approach with the Yamasaki lettuce nutrient solution. The results showed that the lettuce biomass and root items firstly raised and then decreased with the increase of DA-6 concentrations. 100μg·L-1 DA-6 treatment improved the root activity and significantly increased the dry and fresh mass of both shoot and root compared with other treatments,which reached 33.58%~742.86%,11.56%~286.79%,18.60%~264.29% and 11.12%~267.83%,respectively. 1000 μg·L-1 DA-6 treatment reduced the lettuce biomass and root activity in comparison with 0μg·L-1 DA-6 treatment. Different DA-6 concentrations individually impacted on the lettuce qualities. With the increasement of DA-6 concentrations,the nitrate content decreased after the first raise,but the adverse trend of ascorbic acid,soluble sugar and soluble protein contents were observed. 100 μg·L-1 DA-6 treatment significantly reduced the nitrate content by 23.40%than 0 μg·L-1 DA-6 treatment.Whereas,the ascorbic acid,soluble sugar and soluble protein contents of lettuce leaves with 100 μg·L-1 DA-6 treatment significantly in-creased by 24.24%,64.29%and 22.92%compared with 0μg·L-1 DA-6 treatment,respectively. Meanwhile,100μg·L-1 DA-6 treatment increased the SOD,POD and CAT activities,reduced the MDA content,raised the SPAD value,and improved the photosynthesis and chloro-phyll fluorescence properties of lettuce leaves. Under the current experimental conditions,the hydroponic lettuce nutrient solution added in 100μg·L-1 DA-6 was recommended,which not only warranted the high hydroponic lettuce yield but also improved the quality.关键词
水培生菜/DA-6/生长/品质/生理特性Key words
hydroponic lettuce/DA-6/growth/qualities/physiological characteristics分类
农业科技引用本文复制引用
杨修一,李圣会,梅宇超,杨广,孙晓慧,赵晨浩,张民,李成亮..DA-6对水培生菜生长及生理特性的影响[J].农业环境科学学报,2017,36(1):32-38,7.基金项目
“十二五”国家科技支撑计划项目（2011BAD11B01，2011BAD11B02）；国家“948”重点项目（2011-G30）Project supportedThe Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year-Plan Period（2011BAD11B01,2011BAD11B02）；The Key Projects in the National"948"Program during the Twelfth Five-year Plan Period （）
