College of Food Science and Engineering, Nanjing University of Finance and Economics, No.3 Wenyuan Road, Qixia District, Nanjing, 210023, China.
College of Food Science and Light Industry, Nanjing Tech University, No. 30 Puzhu South Road, Pukou District, Nanjing, 211800, China.
Carbohydr Res. 2020 Dec;498:108181. doi: 10.1016/j.carres.2020.108181. Epub 2020 Oct 17.
Based on the characteristics of natural polysaccharides in film-forming, chelating, and environmental friendly, a natural polysaccharide fertilizer agent was selected to increase the utilization of nitrogen fertilizer and increase plant growth. Five polysaccharides: xanthan gum, guar gum, fenugreek gum, welan gum and chitosan were screened for plant growth promoting effect. The results showed that welan gum had the most significant effect on promoting the growth of rice seedlings, and the concentrations of 0.1 mg mL and 0.15 mg mL showed the best growth effects. The effects of welan gum on nitrogen utilization in rice seedlings were investigated. Results showed welan gum increased the contents of ammonium, nitrate, free amino acids, and proteins in rice seedlings. There were four key enzymes of nitrogen metabolism which are nitrate reductase, glutamine synthetase, glutamate synthase, and glutamate dehydrogenase significantly enhanced by welan gum though up-regulating the transcriptional levels of these enzymes. Therefore, nitrogen uptake and nitrogen metabolism in rice seedlings were promoted to increase the biomass of rice seedlings. Based on the research, results showed that welan gum could constitute a promising fertilizer in the future.
基于天然多糖在成膜、螯合和环保方面的特性，选择了一种天然多糖肥料来提高氮肥利用率并促进植物生长。筛选了五种多糖：黄原胶、瓜尔胶、胡芦巴胶、槐豆胶和壳聚糖，以研究其对植物生长的促进作用。结果表明，槐豆胶对水稻幼苗生长的促进作用最为显著，浓度为 0.1 mg/mL 和 0.15 mg/mL 时表现出最佳的生长效果。进一步研究了槐豆胶对水稻幼苗氮素利用的影响。结果表明，槐豆胶增加了水稻幼苗中铵态氮、硝态氮、游离氨基酸和蛋白质的含量。槐豆胶通过上调这些酶的转录水平，显著增强了氮代谢的四个关键酶，即硝酸还原酶、谷氨酰胺合成酶、谷氨酸合酶和谷氨酸脱氢酶的活性。因此，促进了水稻幼苗对氮的吸收和氮代谢，从而增加了水稻幼苗的生物量。基于这些研究结果表明，槐豆胶有望成为未来有前景的肥料之一。
