Piriformospora indica colonization increases the growth, development, and herbivory resistance of sweet potato ( Ipomoea
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ORIGINAL ARTICLE
Piriformospora indica colonization increases the growth, development, and herbivory resistance of sweet potato (Ipomoea batatas L.) Qing Li1 · Yun‑Wei Kuo1 · Kuan‑Hung Lin2 · Weiqun Huang3 · Caisheng Deng1 · Kai‑Wun Yeh4 · Shi‑Peng Chen1 Received: 16 August 2020 / Accepted: 9 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Key message Piriformospora indica symbiosis promoted the growth and photosynthesis, and simultaneously enhanced the resistance against insect herbivory by regulating sporamin-dependent defense in sweet potato. Abstract Piriformospora indica (P. indica), a versatile endophytic fungus, promotes the growth and confers resistance against multiple stresses by root colonization in plant hosts. In this study, the effects of P. indica colonization on the growth, physiological change, and herbivore resistance of leaf-vegetable sweet potato cultivar were investigated. P. indica symbiosis significantly improved the biomass in both above- and under-ground parts of sweet potato plants. In comparison with the non-colonized plants, the content of photosynthetic pigments and the efficiency of photosynthesis were increased in P. indicacolonized sweet potato plants. Further investigation showed that the activity of catalase was enhanced in both leaves and roots of sweet potato plants after colonization, but ascorbate peroxidase, peroxidase, and superoxide dismutase were not enhanced. Furthermore, the interaction between P. indica and sweet potato plants also showed the biological function in jasmonic acid (JA)-mediated defense. The plants colonized by P. indica had greatly increased JA accumulation and defense gene expressions, including IbNAC1, IbbHLH3, IbpreproHypSys, and sporamin, leading to elevated trypsin inhibitory activity, which was consistent with a reduced Spodoptera litura performance when larvae fed on the leaves of P. indica-colonized sweet potato plants. The root symbiosis of P. indica is helpful for the plant promoting growth and development and has a strong function as resistance inducers against herbivore attack in sweet potato cultivation by regulating sporamin-dependent defense. Keywords Piriformospora indica · Sweet potato · Plant-growth promotion · Herbivory defense · Sporamin Abbreviations APX Ascorbate peroxidase Car Carotenoids Chl Chlorophyll CAT Catalase
ETR Relative electron transport rate P. indica Piriformospora indica JA Jasmonic acid SA Salicylic acid SOD Superoxide dismutase TPI Trypsin inhibitor
Communicated by Howard S. Judelson. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00299-020-02636-7) contains supplementary material, which is available to authorized users. * Shi‑Peng Chen [email protected] 1
Sanming Academy of Agricultural Sciences, Sanming, Fujian, China
2
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
3
Fujian Seed General Station, Fuzhou, Fujian, China
4
Institute of Plant Biology, National Taiwa
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