Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, 210046, The People's Republic of China,
Curr Microbiol. 2013 Nov;67(5):631-6. doi: 10.1007/s00284-013-0414-6. Epub 2013 Jun 21.
Fungal entomopathogens, especially Beauveria bassiana, are often studied within the context of their use in biological pest control; however, there is limited knowledge of their distributions in host plants and soil ecosystem. We examined the distribution of B. bassiana and its influence on rice plants and paddy soils. B. bassiana could only be detected on the foliar surfaces of rice plants within 15 days under Bb-4 (7.5 × 10(4) conidia/mL) and Bb-7 (7.5 × 10(7) conidia/mL) treatments. The endophytic colonization of B. bassiana could not be found in stems, roots, or seeds of rice plants under Bb-4 and Bb-7 treatments. The fungus was found only in the leaves of rice plants under Bb-4 and Bb-7 treatments at 15 days after inoculation. Moreover, B. bassiana was absent from paddy soils under Bb-4 and Bb-7 treatments at all times. Enzyme activity (urease and phosphatase) in the paddy soils of Bb-4 and Bb-7 treatments showed no significant difference from the control. It is possible that B. bassiana was not able to colonize paddy soil. Detailed understanding of distribution and ecological interactions of B. bassiana is helpful for understanding and predicting the effects of fungal entomopathogens on host populations, and the interactions among fungal entomopathogens and other organisms in the community.
真菌性昆虫病原物，尤其是球孢白僵菌，通常在生物防治中研究其用途；然而，对于其在宿主植物和土壤生态系统中的分布知之甚少。我们研究了球孢白僵菌的分布及其对水稻植株和稻田土壤的影响。在 Bb-4（7.5×10(4)个分生孢子/mL）和 Bb-7（7.5×10(7)个分生孢子/mL）处理下，仅能在 15 天内在水稻植株的叶片表面检测到球孢白僵菌。在 Bb-4 和 Bb-7 处理下，未发现球孢白僵菌在水稻茎、根或种子中的内生定殖。在接种后 15 天，仅在 Bb-4 和 Bb-7 处理下的水稻叶片中发现该真菌。此外，在 Bb-4 和 Bb-7 处理下，球孢白僵菌在稻田土壤中一直不存在。Bb-4 和 Bb-7 处理的稻田土壤中的酶活性（脲酶和磷酸酶）与对照相比没有显著差异。球孢白僵菌可能无法在稻田土壤中定殖。详细了解球孢白僵菌的分布和生态相互作用有助于理解和预测真菌性昆虫病原物对宿主种群的影响，以及真菌性昆虫病原物与群落中其他生物之间的相互作用。
