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| Effects of DA-6 on growth and physiological characteristics in hydroponic lettuce |
| Received:August 13, 2016 |
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| KeyWord:hydroponic lettuce;DA-6;growth;qualities;physiological characteristics |
| Author Name | Affiliation | E-mail | | YANG Xiu-yi | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | LI Sheng-hui | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | MEI Yu-chao | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | YANG Guang | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | SUN Xiao-hui | Liaocheng Product Quality Supervision & Inspection, Liaocheng 252000, China | | | ZHAO Chen-hao | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | ZHANG Min | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | LI Cheng-liang | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | chengliang_li11@163.com |
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| 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(0,20,100,500,1000 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-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 0 μg·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 increased by 24.24%,64.29% and 22.92% compared with 0 μg·L-1 DA-6 treatment,respectively. Meanwhile,100 μg·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 chlorophyll fluorescence properties of lettuce leaves. Under the current experimental conditions, the hydroponic lettuce nutrient solution added in 100 μg·L-1 DA-6 was recommended, which not only warranted the high hydroponic lettuce yield but also improved the quality. |
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