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19FengJY HeY EI Assembly of root-associated microbiomes of typical rice cultivars in response.pdf (1.74 MB)

Assembly of root-associated microbiomes of typical rice cultivars in response to lindane pollution

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posted on 06.01.2021, 01:18 by Jiayin Feng, Yan Xu, Bin Ma, Caixian Tang, Philip C Brookes, Yan He, Jianming Xu
© 2019 The Authors Organochlorine pesticides have been extensively used for many years to prevent insect diseases of rice (Oryza sativa L.), but little is known about their residual impacts on the underground micro-ecology in anaerobic environment. In this glasshouse study, we characterized the lindane effects on the assembly of root-associated microbiomes of commonly used indica, japonica and hybrid rice cultivars, and their feedback in turn, in modifying lindane anaerobic dissipation during 60 days' rice production. The results showed that rice growth inhibited the anaerobic dissipation of lindane, but was not affected apparently by lindane at initial spiked concentration of 4.62 and 18.54 mg kg−1 soil. Suppressed removal of lindane in rice planted treatments as compared with that in unplanted control was likely due to inhibited reductive dechlorination induced by a comprehensive effect of radial O2 secretion of rice root and co-occurring Fe(III) reduction that consumed electron competitively in rice rhizosphere. However, the hybrid cultivar exhibited a less suppression than the conventional cultivars in high polluted soils. Bacteria was more sensitively responded to lindane pollution than fungal taxa, and Actinobacteria, Chloroflexi, Verrucomicrobia and Proteobacteria were the main different phyla between hybrid and conventional cultivars, with a more stable community structure exhibited in the hybrid rice under lindane stress. Our study highlights the assembly and variation of root-associated microbiomes in responses of lindane pollution, and suggests that hybrid rice cultivar might be most competent for cultivation in paddy fields polluted by lindane and other organochlorine pesticides, especially in the area with high residual levels.

Funding

This research was financially supported by the National Natural Science Foundation of China (41721001, 41771269, 41601248), the National Key Research and Development Program of China (2016YFD0800207), the National Program for Support of Top-notch Young Professionals,and the 111 Project (B17039).

History

Publication Date

05/07/2019

Journal

Environment International

Volume

131

Article Number

104975

Pagination

10p.

Publisher

Elsevier

ISSN

0160-4120

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