| In order to understand the effects of Ginsenoside of stems and leaves on the growth of cucumber seedlings and on the absorption and transport of nitrogen,cucumber’Jinyou 35’was used in this experiment,the cucumber seeds and seedlings were treated with 0 mg·L-1,25mg·L-1,50 mg·L-1,100 mg·L-1,150 mg·L-1,200 mg·L-1.The aim of this study was to determine the effects of different concentrations of Ginsenoside of stems and leaves on seed Germination,seedling growth and physiology of cucumber.At the same time,50 mg·L-1 and 100 mg·L-1Saponin of Ginseng stems and leaves was used to irrigate roots,two nitrogen concentrations of low nitrogen(3.5 mmol-1)and high nitrogen(11.00 mmol-1)were set,and two cucumber varieties were selected to carry out plug seedling experiment in the greenhouse,the effects of Ginseng stem and leaf Saponin on the growth and development of the cucumber seedlings under different nitrogen levels were studied.The results can provide some references for improving cucumber seedling quality,nitrogen uptake and the transport.The main results are as follows:（1）The optimum concentration of Ginsenoside of stems and leaves could promote the germination of cucumber seeds,and the treatment with 50～100 mg·L-1 was better.The seedling growth was well treated with 25～100 mg·L-1,which had certaion promoting effects on plant height,stem thick,shoots dry mass,root dry mass and strong seedling index.The root activity,the chlorophyll content,soluble sugar and protein content of cucumber seedlings were the highest under 50 mg·L-1 treatment,followed by 100 mg·L-1 treatment.Then 150 mg·L-1 and 200mg·L-1 were not conducive to seed germination and seedling growth of cucumber.The comprehensive evaluation of the membership function showed that seed germination was best at100 mg·L-1,and the comprehensive score was 0.941.Seedling growth was best at 50 mg·L-1with a comprehensive score of 0.953.The results showed that the 50～100 mg·L-1 Ginsenoside of stems and leaves could promote the germination of cucumber seeds and seedling growth.（2）Adding 100 mg·L-1 Ginsenoside of stems and leaves significantly promoted the growth of cucumber seedlings at low nitrogen level.It can promote the growth of cucumber seedling root,and increase the leaf area,promote the photosynthesis,increase the soluble sugar and soluble protein content,promote the nitrate reductase（NR）,glutamine synthetase（GS）,aspertate aminotransferase（GOT）,cereal third transaminase（GPT）activity,seedling seedling index and aboveground and underground part increased dry matter weight,seedling growth strong.Under high nitrogen level,Ginsenoside of stems and leaves could promote cucumber seedlings growth,but it had no significant effect on plant height and activities of NR,GS,GOT and GPT.（3）The 100 mg·L-1 Ginsenoside of stems and leaves could effectively reduce the nitrate nitrogen content of cucumber seedlings under the low nitrogen level,and can significantly improve the N accumulation,nitrogen absorption and utilization efficiency of cucumber seedlings.The addition of Ginsenoside of stems and leaves could improve the nitrogen absorption and transport efficiency of cucumber seedlings,and 50 mg·L-1 was the best treatment under the high nitrogen level.（4）Under low nitrogen level,the cucumber seedlings of the nutritional content of N（AN）and functional N（FN）content increased with the increase of processing time,and high nitrogen level,the cucumber seedlings the AN content,FN content was lower after the first rise trend,under different nitrogen levels,structural nitrogen（SN）content in seedlings are falling,but in the same period,add Ginsenoside of stems and leaves can processing of cucumber seedlings were better than CK treatment. |
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