Root-exuded benzoxazinoids can alleviate negative plant-soil feedbacks.

Autor: Gfeller V; Institute of Plant Sciences, University of Bern, 3013, Bern, Switzerland.; Department of Crop Sciences, Research Institute of Organic Agriculture (FiBL), 5070, Frick, Switzerland., Thoenen L; Institute of Plant Sciences, University of Bern, 3013, Bern, Switzerland., Erb M; Institute of Plant Sciences, University of Bern, 3013, Bern, Switzerland.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2024 Mar; Vol. 241 (6), pp. 2575-2588. Date of Electronic Publication: 2023 Dec 12.
DOI: 10.1111/nph.19401
Abstrakt: Plants can suppress the growth of other plants by modifying soil properties. These negative plant-soil feedbacks are often species-specific, suggesting that some plants possess resistance strategies. However, the underlying mechanisms remain largely unknown. Here, we investigated whether benzoxazinoids, a class of dominant secondary metabolites that are exuded into the soil by maize and other cereals, allow maize plants to cope with plant-soil feedbacks. We find that three out of five tested crop species reduce maize (Zea mays L.) performance via negative plant-soil feedbacks relative to the mean across species. This effect is partially alleviated by the capacity of maize plants to produce benzoxazinoids. Soil complementation with purified benzoxazinoids restores the protective effect for benzoxazinoid-deficient mutants. Sterilization and reinoculation experiments suggest that benzoxazinoid-mediated protection acts via changes in soil biota. Substantial variation of the protective effect between experiments and soil types illustrates context dependency. In conclusion, exuded plant secondary metabolites allow plants to cope with plant-soil feedbacks. These findings expand the functional repertoire of plant secondary metabolites and reveal a mechanism by which plants can resist negative effects of soil feedbacks. The uncovered phenomenon may represent a promising avenue to stabilize plant performance in crop rotations.
(© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.)
Databáze: MEDLINE
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