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- W4385918099 abstract "Plants have evolved various resistance mechanisms to cope with biotic stresses that threaten their survival. The BBE23 member (At5g44360/BBE23) of the Arabidopsis berberine bridge enzyme-like (BBE-l) protein family (Arabidopsis thaliana) has been characterized in this paper in parallel with the closely related and previously described CELLOX (At4g20860/BBE22). Both enzymes, renamed here as CELLOX2 and CELLOX1, respectively, oxidize, besides cellodextrins, the mixed-linked β-1➝3/β-1➝4-glucans (MLGs), recently described as capable of activating plant immunity, reinforcing the view that the BBE-l family includes members that are devoted to the control of the homeostasis of potential cell wall-derived damage-associated molecular patterns (DAMPs). The two putatively paralogous genes display different expression profiles. Unlike CELLOX1, CELLOX2 is not expressed in seedlings or adult plants and is not involved in immunity against Botrytis cinerea. Both are instead expressed in a concerted manner in the seed coat during development. Whereas CELLOX2 is expressed mainly during the heart stage, CELLOX1 is expressed at the immediately later stage, when the expression of CELLOX2 decreases. Analysis of seeds of cellox1 and cellox2 knock-out mutants show alterations in the coat structure: the columella area is smaller in cellox1, radial cell walls are thicker in both cellox1 and cellox2, and the mucilage halo is reduced in cellox2. However, the coat monosaccharide composition is not significantly altered, suggesting an alteration of the organization of the cell wall, thus reinforcing the notion that the architecture of the cell wall in specific organs is determined not only by the dynamics of the synthesis/degradation of the main polysaccharides but also by its enzymatic oxidation." @default.
- W4385918099 created "2023-08-18" @default.
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- W4385918099 date "2023-08-17" @default.
- W4385918099 modified "2023-10-14" @default.
- W4385918099 title "Berberine bridge enzyme–like oxidases of cellodextrins and mixed-linked β-glucans control seed coat formation" @default.
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- W4385918099 doi "https://doi.org/10.1093/plphys/kiad457" @default.
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