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Biodiversity of Entomopathogenic Fungi in the Soils of South China.
Niu X
,
Xie W
,
Zhang J
,
Hu Q
.
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The southern part of China, located in tropical and south subtropical areas has unique natural environments, but the distributions of entomopathogenic fungi (EFs) in the soil are not clear. In this research, 198 soil samples were collected from the four Provinces (Autonomous Region) of South China. The results indicated that a total of 292 fungal isolates were obtained from 176 soil samples. Then, based on the morphological and rDNA-ITS sequences analysis, 213 EFs isolates of 19 species in 12 genera were identified. Furthermore, Purpureocillium lilacinum with 75 isolates was recognized as the absolutely dominant EF species, while Isaria javanica, Metarhizium anisopliae, and Beauveria bassiana (respectively with 29, 26, and 26 isolates) were the richer species. The data also indicated that Guangxi Province has the best EFs diversity with the Shannon-Wiener index (SWI) of 2.29, the soils covered with grass had the best EFs diversity with the 2.14 SWI, while the orchard and fallow land had the lowest SWI of 1.52, which suggested that the diversity of plants and insects on ground, as well as the massive application of broad-spectrum fungicides, affect the EFs diversity in the soil. Finally, the rare species, Nectria mauritiicola and Scopulariopsis brumptii were first reported about their entomopathogenic activities against Bemisia tabaci. Our experiment will give new insights to the understanding of EFs distribution characteristics and their biodiversity conservation.
Figure 1. The map of sites distribution for the soil samples collection.
Figure 2. Phylogenetic tree of Purpureocillium spp. (A) and Metarhizium spp. (B) isolates.
Figure 3. Phylogenetic tree of the Isaria spp. (A) and Beauveria bassiana (B) isolates.
Figure 4. Phylogenetic tree of the Pochonia/Metapochonia spp. (A) and other (B) isolates.
Figure 5. The feature profiles of entomopathogenic fungi (EFs) and the symptoms of whiteflies infected by different isolates. A, BbGD07 of Beauveria bassiana; B, IfFJ05 of Isaria fumosorosea; C, LpGD62 of Lecanicillium psalliotae; D, ClspGX21G03 of Clonostachys sp.; E, MaFJ07 of Metarhizium anisopliae; F, NmGX2905 of Nectria mauritiicola; G, PamGD01 of Metarhizium marquandii; H, PhvGX77A02 of Phialophora verrucosa; I, PlHN01 of Purpureocillium lilacinum; J, PocGD43 of Pochonia chlamydosporia; K, SbGX7705 of Scopulariopsis brumptii; 1, colony; 2, conidial structure; 3, symptoms of whiteflies. Bar = 10 μm.
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