Abstract
Trichoderma spp. are proposed as major plant growth-promoting fungi that widely exist in the natural environment. These strains have the abilities of rapid growth and reproduction and efficient transformation of soil nutrients. Moreover, they can change the plant rhizosphere soil environment and promote plant growth. Pinus sylvestris var. mongolica has the characteristics of strong drought resistance and fast growth and plays an important role in ecological construction and environmental restoration. The effects on the growth of annual seedlings, root structure, rhizosphere soil nutrients, enzyme activity, and fungal community structure of P. sylvestris var. mongolica were studied after inoculation with Trichoderma harzianum E15 and Trichoderma virens ZT05, separately. The results showed that after inoculation with T. harzianum E15 and T. virens ZT05, seedling biomass, root structure index, soil nutrients, and soil enzyme activity were significantly increased compared with the control (p < 0.05). There were significant differences in the effects of T. harzianum E15 and T. virens ZT05 inoculation on the growth and rhizosphere soil nutrient of P. sylvestris var. mongolica (p < 0.05). For the E15 treatment, the seedling height, ground diameter, and total biomass of seedlings were higher than that those of the ZT05 treatment, and the rhizosphere soil nutrient content and enzyme activity of the ZT05 treatment were higher than that of the E15 treatment. The results of alpha and beta diversity analyses showed that the fungi community structure of rhizosphere soil was significantly different (p < 0.05) among the three treatments (inoculated with T. harzianum E15, T. virens ZT05, and not inoculated with Trichoderma). Overall, Trichoderma inoculation was correlated with the change of rhizosphere soil nutrient content.
Highlights
IntroductionTrichoderma species belong to Hyphomyceteales, Hyphomycetes, Deuteromycotina, and Eumycota
Trichoderma species belong to Hyphomyceteales, Hyphomycetes, Deuteromycotina, and Eumycota.Their existence in the natural ecological environment is widespread; for example, they are found in plant seeds, the rhizosphere, the phyllosphere, corms, and soils
The results of alpha and beta diversity analyses showed that the fungi community structure of rhizosphere soil was significantly different (p < 0.05) among the three treatments
Summary
Trichoderma species belong to Hyphomyceteales, Hyphomycetes, Deuteromycotina, and Eumycota. Their existence in the natural ecological environment is widespread; for example, they are found in plant seeds, the rhizosphere, the phyllosphere, corms, and soils. These species have plant growth promotion and soil environment improvement abilities [1,2]. Chang and Baler [15] treated seeds or roots of pepper, Vinca, chrysanthemum, tomato, and cucumber with a conidia suspension of Trichoderma harzianum T-203 and found that the germination rate of pepper. During the interaction among Trichoderma harzianum, Trichoderma virens, and Arabidopsis thaliana, the contents of the JA (jasmonic acid) and (salicylic acid) SA and the number of lateral roots were all significantly increased [16,17]
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