Cell wall arabinan is essential for guard cell function

AUTOR(ES)

Jones, Louise

FONTE

National Academy of Sciences

RESUMO

Stomatal guard cells play a key role in the ability of plants to survive on dry land, because their movements regulate the exchange of gases and water vapor between the external environment and the interior of the plant. The walls of these cells are exceptionally strong and must undergo large and reversible deformation during stomatal opening and closing. The molecular basis of the unique strength and flexibility of guard cell walls is unknown. We show that degradation of cell wall arabinan prevents either stomatal opening or closing. This locking of guard cell wall movements can be reversed if homogalacturonan is subsequently removed from the wall. We suggest that arabinans maintain flexibility in the cell wall by preventing homogalacturonan polymers from forming tight associations.

Documentos Relacionados

• Cell Wall Core Galactofuran Synthesis Is Essential for Growth of Mycobacteria
• Cell Wall Core Galactofuran Synthesis Is Essential for Growth of Mycobacteria
• Schizosaccharomyces pombe Pmr1p Is Essential for Cell Wall Integrity and Is Required for Polarized Cell Growth and Cytokinesis
• The Cell Wall Hydroxyproline-Rich Glycoprotein RSH Is Essential for Normal Embryo Development in Arabidopsis
• The embAB genes of Mycobacterium avium encode an arabinosyl transferase involved in cell wall arabinan biosynthesis that is the target for the antimycobacterial drug ethambutol.