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Unravelling the beneficial role of microbial contributors in reducing the allelopathic effects of weeds

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Abstract

The field of allelopathy is one of the most fascinating but controversial processes in plant ecology that offers an exciting, interdisciplinary, complex, and challenging study. In spite of the established role of soil microbes in plant health, their role has also been consolidated in studies of allelopathy. Moreover, allelopathy can be better understood by incorporating soil microbial ecology that determines the relevance of allelopathy phenomenon. Therefore, while discussing the role of allelochemicals in plant–plant interactions, the dynamic nature of soil microbes should not be overlooked. The occurrence and toxicity of allelochemicals in soil depend on various factors, but the type of microflora in the surroundings plays a crucial role because it can interfere with its allelopathic nature. Such microbes could be of prime importance for biological control management of weeds reducing the cost and ill effects of chemical herbicides. Among microbes, our main focus is on bacteria—as they are dominant among other microbes and are being used for enhancing crop production for decades—and fungi. Hence, to refer to both bacteria and fungi, we have used the term microbes. This review discusses the beneficial role of microbes in reducing the allelopathic effects of weeds. The review is mainly focused on various functions of bacteria in (1) reducing allelopathic inhibition caused by weeds to reduce crop yield loss, (2) building inherent defense capacity in plants against allelopathic weed, and (3) deciphering beneficial rhizospheric process such as chemotaxis/biofilm, degradation of toxic allelochemicals, and induced gene expression.

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Acknowledgments

The study was supported by Task Force grant NWP-006 from the Council of Scientific and Industrial Research (CSIR), New Delhi, India awarded to CSN. SM thanked CSIR for awarding Senior Research Fellowship.

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  1. Division of Plant Microbe Interactions, CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India

    Sandhya Mishra & Chandra Shekhar Nautiyal

  2. Department of Botany, Banaras Hindu University, Varanasi, 221005, India

    Ram Sanmukh Upadhyay

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  1. Sandhya Mishra
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Mishra, S., Upadhyay, R.S. & Nautiyal, C.S. Unravelling the beneficial role of microbial contributors in reducing the allelopathic effects of weeds. Appl Microbiol Biotechnol 97, 5659–5668 (2013). https://doi.org/10.1007/s00253-013-4885-y

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