Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (7): 224-235.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1251

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Effects of Trichoderma harzianum ST02 on the Growth of Peppermint and Physicochemical Properties of Root Zone Soil Under Salt Stress

ZHAO Zhong-juan1(), YANG Kai1, HU Jin-dong1, WEI Yan-li1, LI Ling1, XU Wei-sheng2, LI Ji-shun1()   

  1. 1. Shandong Province Key Laboratory of Applied Microbiology,Ecology Institute of Shandong Academy of Sciences,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250103
    2. Zhuge Agricultural Service Center,Yishui County,Shandong Province,Linyi 276422
  • Received:2021-09-28 Online:2022-07-26 Published:2022-08-09
  • Contact: LI Ji-shun E-mail:zzjfrances@aliyun.com;yewu2@sdas.org

Abstract:

The salt-resistant Trichoderma harzianum strain ST02 and salt-resistant peppermint were used in this study to analyze the effects of Trichoderma on plant salt resistance and saline soil improvement. The physiological and growth traits of peppermint,the soil physicochemical property and soil enzyme activity of root zone soil under salt stress were analyzed. And the main soil factors related to the physiological and growth of peppermint were analyzed through the correlation analysis and principal component analysis(PCA). The results showed ST02 relieved the inhibition of NaCl on peppermint growth and photosynthesis and promoted its growth and photosynthesis intensity under salt stress. When treated with NaCl,ST02 reduced the accumulation of maldehyde aldehyde(MDA),soluble protein(SP)and proline(Pro)in peppermint cells,enhanced superoxide dismutase(SOD),peroxide dismutase(POD),and catalase(CAT)activities,and enhanced the salt resistance of peppermint through antioxidant response. The physiological/growth comprehensive index(PGCI)of peppermint treated with NaCl was -2.391,ST02 promoted the physiological and growth of peppermint,as index was -0.025. ST02 influenced the soil physicochemical properties for root zone soil of peppermint under NaCl stress,reduced salinity by 17.36%,and significantly enhanced the content of alkali-hydrolyzed nitrogen(AN). The soil enzyme activity for the root zone soil of peppermint was also affected by ST02 strain,and the activity of soil cellulase(SCL)and catalase(SCAT)increased remarkably. The soil physicochemical property and soil enzyme activity affected the physiological and growth traits under NaCl stress through the correlation analysis. And the main soil factor for physiological and growth of peppermint was:EC(electrical conductance)> SCL >SSC(soil saccharase)/SNEP(soil neutrality phosphatase)>AP(available phosphorus)>pH.

Key words: salt-resistant Trichoderma, salt-resistant plant, Mentha×piperita L., physiological and growth index, soil physicochemical property, soil enzyme activity