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Rapid Changes In Cell Wall Pectic Polysaccharides Are Closely Associated With Early Stages Of Aerenchyma Formation, A Spatially Localized Form Of Programmed Cell Death In Roots Of Maize ( Zea Mays L.) Promoted By Ethylene

A. Gunawardena, D. E. Pearce, M. B. Jackson, C. Hawes, D. Evans
Published 2001 · Biology

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Aerenchyma formation in roots of maize ( Zea mays L.) involves programmed death of cortical cells that is promoted by exogenous ethylene (1 µ µ µ L L − 1 ) or by endogenous ethylene produced in response to external oxygen shortage (3%, v/v). In this study, evidence that degeneration of the cell wall accompanies apoptotic-like changes previously observed in the cytoplasm and nucleus (Gunawardena et al . Planta 212, 205‐214, 2001), has been sought by examining de-esterified pectins (revealed by monoclonal antibody JIM 5), and esterified pectins (revealed by monoclonal antibody JIM 7). In controls, de-esterified wall pectins were found at the vertices of triangular junctions between cortical cells (untreated roots). Esterified pectins in control roots were present in the three walls bounding triangular cell-to-cell junctions. After treatment with 3% oxygen or 1 µ L L − 1 ethylene, this pattern was lost but walls surrounding aerenchyma gas spaces became strongly stained. The results showed that cell wall changes commenced within 0·5 d and evidently were initiated by ethylene in parallel with cytoplasmic and nucleoplasmic events associated with classic intracellular processes of programmed cell death.
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