Arbuscular mycorrhizal fungi improve the growth and drought tolerance of Cinnamomum migao by enhancing physio‐biochemical responses

作者：Qiuxiao Yan, Xiangying Li, Xiao Xuefeng, Jing‐Zhong Chen, Jiming Liu, Changhu Lin, Ruiting Guan, Daoping Wang · 发表于：Ecology and Evolution · 年份：2022 · DOI：10.1002/ece3.9091 · 被引用次数：38 · 研究领域：Mycorrhizal Fungi and Plant Interactions、Plant Parasitism and Resistance、Fungal Biology and Applications

Abstract Drought is the main limiting factor for plant growth in karst areas with a fragile ecological environment. Cinnamomum migao H.W. Li is an endemic medicinal woody plant present in the karst areas of southwestern China, and it is endangered due to poor drought tolerance. Arbuscular mycorrhizal fungi (AMF) are known to enhance the drought tolerance of plants. However, few studies have examined the contribution of AMF in improving the drought tolerance of C. migao seedlings. Therefore, we conducted a series of experiments to determine whether a single inoculation and coinoculation of AMF ( Claroideoglomus lamellosum and Claroideoglomus etunicatum ) enhanced the drought tolerance of C. migao . Furthermore, we compared the effects of single inoculation and coinoculation with different inoculum sizes (20, 40, 60, and 100 g; four replicates per treatment) on mycorrhizal colonization rate, plant growth, photosynthetic parameters, antioxidant enzyme activity, and malondialdehyde (MDA) and osmoregulatory substance contents. The results showed that compared with nonmycorrhizal plants, AMF colonization significantly improved plant growing status; net photosynthetic rate; superoxide dismutase, catalase, and peroxidase activities; and soluble sugar, soluble protein, and proline contents. Furthermore, AMF colonization increased relative water content and reduced MDA content in cells. These combined cumulative effects of AMF symbiosis ultimately enhanced the drought tolerance of seed...