Effects of arbuscular mycorrhizal fungi on biomass,nutrient uptake and root exudates of Ipomoea batatas L.
To explore the impact of arbuscular mycorrhizal fungi(AMF)on the growth and development of Ipomoea batatas L.,Claroideoglomus etunicatum(a kind of AMF)was inoculated respectively in low-potassi-um(K0)and high-potassium(K1)soils,and the bio-mass,uptake amounts of nitrogen,phosphorus,potassium and root exudates of Ipomoea batatas L.were measured in this study.The results showed that arbuscular mycorrhizal fungi could significantly increase the dry weight of Ipomoea bata-tas L.roots and the nitrogen,phosphorus and potassium uptake amounts of the roots(P<0.05).There was an ex-tremely significant positive correlation between the colonization rate of arbuscular mycorrhizal fungi in the roots and the nitrogen,phosphorus and potassium uptake amounts of the roots(P<0.01).Claroideoglomus etunicatum,the arbus-cular mycorrhizal fungus,had a significant impact on lipid and lipid-like molecules and organic heterocyclic com-pounds in the root exudates of Ipomoea batatas L..In low-potassium soil,Claroideoglomus etunicatum mainly affected the membrane transport proteins and mineral absorption of the host plants;in high-potassium soil,it mainly influenced the synthesis of plant hormones and the synthesis of plant secondary metabolites of the host plants.The colonization rate of arbuscular mycorrhizal fungi in Ipomoea batatas L.,as well as the nitrogen,phosphorus and potassium uptake amounts of sweet potato roots,had a relatively strong correlation with Caryoptosidic acid,6-trans-leukotriene B4,leu-kotriene B4,2-hydroxy-4-methylvaleric acid,reticuline,L-arabitol,tropic acid,hesperetin and kanzonol F.These metabolites may play a key role in the process of arbuscular mycorrhizal fungi colonizing the roots of Ipomoea batatas L..This study is helpful for analyzing the growth-promoting effect of arbuscular mycorrhizal fungi and its potential eco-logical functions in the ecosystem,and provides a theoretical basis for the application of arbuscular mycorrhizal fungi in Ipomoea batatas L.production.
万方数据
维普
