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

作　　者：杨修一 李圣会 梅宇超 杨广[1] 孙晓慧 赵晨浩[1] 张民[1] 李成亮[1] 

机构地区：[1]土肥资源高效利用国家工程实验室,山东农业大学资源与环境学院,山东泰安271018 [2]聊城市产品质量监督检验所,山东聊城252000

出　　处：《农业环境科学学报》2017年第1期32-38,共7页Journal of Agro-Environment Science

基　　金：“十二五”国家科技支撑计划项目(2011BAD11B01,2011BAD11B02);国家“948”重点项目(2011-G30)~~

摘　　要：在山崎生菜营养液中添加5个不同浓度(0、20、100、500、1000μg·L-1)的高能植物生长调节剂DA-6,研究其对生菜生长及生理特性的影响。结果表明:随着DA-6浓度的增加,生菜的生物量和根系指标呈先增加后降低的趋势。100μg·L-1DA-6处理较其他处理提升了根系活力,并显著增加了生菜地上部干鲜重和根系干鲜重,增幅分别达到33.58%~742.86%、11.56%~286.79%、18.60%~264.29%和11.12%~267.83%。高浓度1000μg·L-1DA-6处理较对照处理降低了生菜生物量和根系活力。不同浓度的DA-6对生菜各项品质指标影响不同,随着DA-6浓度的增加,生菜中硝酸盐含量先降低后升高,但抗坏血酸、可溶性糖和可溶性蛋白含量则先增加后减少。100μg·L-1DA-6处理生菜硝酸盐含量较对照处理显著降低了23.40%,而抗坏血酸、可溶性糖和可溶性蛋白含量分别较对照处理显著增加了24.24%、64.29%和22.92%。此外,100μg·L-1DA-6提高了生菜叶片SOD、POD和CAT活性,降低了MDA含量,增加了叶片SPAD值,提升了光合和叶绿素荧光特性。在该试验条件下,推荐水培生菜营养液中添加浓度100μg·L-1DA-6,既保证了水培生菜的高产又提升了品质。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（0,20,100,500,1000 μg·L-1）on lettuce growth and physiological characteristics were investigated by hydroponic 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. 100 μg·L-1DA-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-1DA-6 treatment reduced the lettuce biomass and root activity in comparison with 0 μg·L-1DA-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-1DA-6 treatment significantly reduced the nitrate content by 23.40% than 0 μg·L-1DA-6 treatment.Whereas,the ascorbic acid,soluble sugar and soluble protein contents of lettuce leaves with 100 μg·L-1DA-6 treatment significantly increased by 24.24%,64.29% and 22.92% compared with 0 μg·L-1DA-6 treatment,respectively. Meanwhile,100 μg·L-1DA-6 treatment increased the SOD,POD and CAT activities,reduced the MDA content,raised the SPAD value,and improved the photosynthesis and chlorophyll fluorescence properties of lettuce leaves. Under the current experimental conditions,the hydroponic lettuce nutrient solution added in100 μg·L-1DA-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 

分 类 号：S482.8[农业科学—农药学]