Inducible silica incrusts in cell walls of <i>Vitis</i> leaves
DOI:
https://doi.org/10.5073/vitis.1989.28.73-80Keywords:
silicon, mineral, oidium, fungus, leaf, epidermis, parenchyma, cell wall, resistanceAbstract
Epidermal cells of Vitis cvs attacked by powdery mildew or damaged mechanically exhibited silica deposits in the walls of the attacked and surrounding cells. Entire or parts of cell walls were vitrified to such an extent that pure, mechanically resistant silica skeletons remained after a treatment with conc. H2S04 + H2O2 at 400 °C and washing with conc. HCl. They consisted of groups of 1-20 cells of the upper epidermis with adhering parts of the corresponding palisade cells or of the lower epidermis (including stomatal cells) with adhering spongy parenchyma. Not only cell walls but also wrinkles of the upper epidermis, defense papillae and fungal haustoria were silicified. Silica accumulations were greater in resistant than in susceptible cultivars.Downloads
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