J Integr Plant Biol. ›› 2020, Vol. 62 ›› Issue (9): 1433-1451.DOI: 10.1111/jipb.12905

• Plant-biotic Interactions • Previous Articles    

Colonization of endophyte Acremonium sp. D212 in Panax notoginseng and rice mediated by auxin and jasmonic acid

Li Han1,2,3†, Xuan Zhou1,2,3†, Yiting Zhao1,2,3,4, Shusheng Zhu1,2,3, Lixia Wu1,2,3, Yunlu He1, Xiangrui Ping1, Xinqi Lu1, Wuying Huang1, Jie Qian1, Lina Zhang1, Xi Jiang1, Dan Zhu1, Chongyu Luo1,2,3, Saijie Li1, Qian Dong1, Qijing Fu1,2,3, Kaiyuan Deng5, Xin Wang1, Lei Wang6, Sheng Peng1,2,3, Jinsong Wu6, Weimin Li7, Jiří Friml8, Youyong Zhu1,2,3, Xiahong He1,2,3,9* and Yunlong Du1,2,3*   

  1. 1College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
    2State Key Laboratory for Conservation and Utilization of Bio‐Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China
    3Key Laboratory of Agro‐Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural University, Kunming 650201, China
    4Industrial Crop Research Institute, Shanxi Academy of Agricultural Sciences, Fenyang 032200, China
    5Department of Steering Committee, Yunnan Agricultural University, Kunming 650201, China
    6Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
    7Mengzi Seed Management Station, Mengzi 661199, China
    8Institute of Science and Technology Austria (IST Austria), Klosterneuburg, Austria
    9College of Horticulture and Landscape, Southwest Forestry University, Kunming 650224, China

    These authors contributed equally to this work.
    *Correspondences:
    Email: Yunlong Du (yunlongdu@aliyun.com, Dr. Du is fully responsible for the distribution of all materials associated with this article); Xiahong He (hexiahong@googlemail.com)
  • Received:2019-08-01 Accepted:2020-01-02 Online:2020-01-07 Published:2020-09-01

Abstract:

Endophytic fungi can be beneficial to plant growth. However, the molecular mechanisms underlying colonization of Acremonium spp. remain unclear. In this study, a novel endophytic Acremonium strain was isolated from the buds of Panax notoginseng and named Acremonium sp. D212. The Acremonium sp. D212 could colonize the roots of P. notoginseng, enhance the resistance of P. notoginseng to root rot disease, and promote root growth and saponin biosynthesis in P. notoginseng. Acremonium sp. D212 could secrete indole‐3‐acetic acid (IAA) and jasmonic acid (JA), and inoculation with the fungus increased the endogenous levels of IAA and JA in P. notoginseng. Colonization of the Acremonium sp. D212 in the roots of the rice line Nipponbare was dependent on the concentration of methyl jasmonate (MeJA) (2–15 μmol/L) and 1‐naphthalenacetic acid (NAA) (10–20 μmol/L). Moreover, the roots of the JA signaling‐defective coi1‐18 mutant were colonized by Acremonium sp. D212 to a lesser degree than those of the wild‐type Nipponbare and miR393b‐overexpressing lines, and the colonization was rescued by MeJA but not by NAA. It suggests that the cross‐talk between JA signaling and the auxin biosynthetic pathway plays a crucial role in the colonization of Acremonium sp. D212 in host plants.

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