In this paper, cucumber seedlings were sprayed exogenously with alginate oligosaccharide, and the cucumber seedlings were divided into sprayed and unsprayed groups.
Then prepare different concentrations (0.05%, 0.1%, 0.2%, 0.3%, 0.5%, ) of alginate oligosaccharide solution to spray cucumber seedlings.
The aim was to explore the effects of different concentrations of alginate oligosaccharide on the growth, yield, and quality of cucumber, and to conduct a preliminary study on the mechanism of alginate oligosaccharide on crops.
1. Alginate oligosaccharide promotes the growth and development of cucumber seedlings, mainly as the biomass (plant height, stem diameter) increases with the increase of the concentration, and the number of leaves increases. Compared with the unsprayed group, the biomass of the sprayed group was improved. The fruit yield has also increased.
2. After spraying the algae oligosaccharide, the quality of the fruit was improved. Among them, the concentration of vitamin C content of 0.1% increased the most significantly, which was 1.34 times that of the non-spraying group. The treatment effect of 0.5% concentration of soluble protein content was 1.59 times that of the unsprayed group. The concentration of soluble sugar content of 0.2% and 0.3% had the best effect, and both groups were 1.39 times that of the unsprayed group.
3. The CAT activity of cucumber leaves was significantly increased (p<0.05) after the algal oligosaccharide spraying, the 0.2% treatment was 1.40 times that of the non-spraying group, and the 0.2% treatment at fruit stage was 5.03 times that of the non-spraying group. The POD activity of leaves was stimulated, and the 0.2% treatment was 1.01 times that of the non-spraying group, and the SOD activity did not increase significantly. The activities of CAT, POD, SOD, APX and GR in fruits all increased, and the 0.2% treatment had the largest increase compared with CK.