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- W3147362361 abstract "Aims Border cells and their secretory mucilage can form a layer over the surface of younger parts of roots to help form a rhizosheath protecting the root tip from biotic and abiotic stresses. Our objective was to investigate the ecological role of mucilage secretion strategies in response to Al exposure and absence. Methods Soybean (Glycine max) 'Zheqiu No. 2' and 'Zhechun No. 3' were used in this study. Seed-lings were aeroponically cultured in 0.2 mmol·L–1 CaCl2 solution, pH 4.5, containing 0, 100, 200, 300 or 400 μmol·L–1 AlCl3. Half of the seedlings were harvested after 24 h Al exposure and the other half continued to culture in the absence of Al3+. We measured percent viability of border cells, mucilage thickness and relative root elongation. Important findings Percent viability of root border cells decreased with increasing external Al3+ con-centrations in both cultivars. Percent viability of 'Zheqiu No. 2' border cells decreased slightly after a 3–12 h treatment with 100, 200, or 400 μmol·L–1 Al3+ and then slightly increased with treatment time, whereas the same change in 'Zhechun No. 3' seedlings was noted at Al3+ concentrations of 300 and 400 μmol·L–1. Al3+ induced a thicker mucilage layer around border cells of both cultivars, with a maximum of 17 μm after 24 h at 400 μmol·L–1 Al3+. 'Zheqiu No. 2' border cells developed a thicker mucilage layer within 3-6 h in response to 100 and 200 μmol·L–1 Al3+, while 'Zhechun No. 3' cells exhibited the same change after 12 h to 300 μmol·L–1 Al3+. Relative root elongation of 'Zheqiu No. 2' exposed to 400μmol·L–1 Al3+ was significantly higher than to 100–300 μmol·L–1 Al3+ treatment, while 'Zhechun No. 3' exhibited reduced relative root elongation after exposure to 100–400 μmol·L–1 Al3+. With Al3+ recovery treatment, 'Zheqiu No. 2' border cells developed a thinner layer of mucilage in the absence of Al3+ com-pared with Al3+ exposure, while 'Zhechun No. 3' border cells continued to secrete a conspicuous layer of mucilage. Rapid induction of mucilage production exposure to Al3+ stress and abrupt halt by border cells is a specific response to Al3+ stress and recovery for Al-resistant soybean cultivar." @default.
- W3147362361 created "2021-04-13" @default.
- W3147362361 creator A5088134606 @default.
- W3147362361 date "2008-01-01" @default.
- W3147362361 modified "2023-09-24" @default.
- W3147362361 title "DYNAMIC RESPONSE OF ROOT BORDER CELLS AND THEIR ASSOCIATED MUCILAGE EXUDATION IN SOYBEAN TO Al STRESS AND RECOVERY" @default.
- W3147362361 hasPublicationYear "2008" @default.
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