Screening of Excellent Ectomycorrhizal Fungi-tree for Drought Resistant with Pinus sylvestris var. mongolica

doi:10.7525/j.issn.1673-5102.2020.01.018

Abstract

Abstract: In order to screening the excellent ectomycorrhizal fungi-tree for drought resistant with Pinus sylvestris var. mongolica in Honghuaerji. Five dominant ectomycorrhizal fungi strains in P.sylvestris var. mongolica forest were used as inoculants to artificially inoculate five-month-old seedlings of P.sylvestris var. mongolica. The mycorrhizal infection and morphology were observed after eight months, and the mycorrhizal seedlings growth and physiological and biochemical indexes were detected under non-drought stress and drought stress conditions. The results show that five native strains could successfully infect P.sylvestris var. mongolica and form typical ectomycorrhiza. All growth indexes of mycorrhizal seedlings were significantly higher than CK under drought stress condition(P<0.05). It was the highest colonization rate, height, aboveground biomass, underground biomass, and root-shoot rate that seedlings were inoculated with Suillus bovinus. Ectomycorrhizal symbionts can improve drought tolerance of P.sylvestris var. mongolica by increasing SOD and POD activities and reducing MDA content. The wilting time of all inoculated seedlings was delayed compared with the control under drought stress. The longest delay was the inoculation of S.bovinus, which was 96.3 h later than the control. In addition, inoculation treatment could significantly prolong the critical lethal time of the host, especially the inoculation of S.bovinus could prolong 113.8 h. Thererfore, S.bovinus and P.sylvestris var. mongolica were an ideal combination of drought-resistant ectomycorrhizal fungi-tree.

Key words: Honghuaerji, Pinus sylvestris var. mongolica, ectomycorrhiza, drought stress

CLC Number:

Q948.1

ZHAO Min, HAO Wen-Ying, NING Xin-Zhe, HAO Long-Fei, YAN Hai-Xia, MU Ya-Nan, BAI Shu-Lan. Screening of Excellent Ectomycorrhizal Fungi-tree for Drought Resistant with Pinus sylvestris var. mongolica[J]. Bulletin of Botanical Research, 2020, 40(1): 133-140.

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