1. Soil microorganisms alleviate the allelopathic effect of Eucalyptus grandis × E. urophylla leachates on Brassica chinensis
- Author
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Fenglai Lu, Huashou Li, Dian-Peng Li, Yueyuan Chen, Rensen Zeng, and Lilang Zheng
- Subjects
0106 biological sciences ,biology ,Microorganism ,fungi ,Brassica ,food and beverages ,Biomass ,Forestry ,Plant community ,biology.organism_classification ,complex mixtures ,010603 evolutionary biology ,01 natural sciences ,Eucalyptus ,Horticulture ,Germination ,Soil water ,Botany ,Allelopathy ,010606 plant biology & botany - Abstract
Soil microbes may be critical players in determining the allelopathic potential of some plants. Low levels of plant community biodiversity in Eucalyptus plantations have been attributed to the allelopathic potential of these tree species. The role of soil microbes in the allelopathic effect of leaf leachates of the hybrid tree Eucalyptus grandis × E. urophylla, was tested in Petri dish assays with Brassica chinensis as a receiver plant. Soils were collected from either a local garden (soil A) or a Eucalyptus plantation (soil B) and half of each soil was sterilized to remove microbes. These soils were then treated with E. grandis × E. urophylla leachates for 0–72 h. Seed germination of B. chinensis was significantly inhibited in soils treated with leaf leachates relative to untreated soils. The inhibitory effect of the leaf leachates was more pronounced in sterilized soils. Total phenolic content was obvious lower in nonsterile leachate-treated soils than in sterile soils. Biomass of B. chinensis was negatively correlated with the total phenolic content in soils. Our findings suggest that soil microbes can alleviate the allelopathic potential of Eucalyptus and thereby its negative impact on plant growth.
- Published
- 2017