Boron deficiency effects on peroxidase, hydroxyproline, and boron in cell walls and cytoplasm of Helianthus annuus L. hypocotyls

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Boron-deficient sunflower hypocotyls have, on a fresh weight basis, more cytoplasmic and cell wall peroxidase, more cytoplasmic hydroxyproline but equal cell wall hydroxyproline, and slightly less cell wall boron, than controls. Incubation of either B-deficient or control cell wall suspensions with Sclerotium rolfsii culture filtrate released 80% of the peroxidase activity, but only 14 to 30% of the hydroxyproline. This differential extraction suggests that the hydroxyproline-containing protein of cell walls is not identical with peroxidase. Boron deficiency increased the susceptibility of cell walls to degradation by fungal enzymes, as measured by release of peroxidase and hydroxyproline, but not by reduction in dry weight.
日本植物生理学会の論文