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Pierce's Disease
Research Updates

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What is Pierce's Disease?

Pierce's Disease is a bacterial infection, which is spread by bugs that feed on grapevines, particularly the "glassy winged sharpshooter." Grapevines that become infected with PD can quickly become sick and die.

glassy-winged sharpshooter

A cationic peroxidase from leaves of Vitis pseudoreticulata

  • Author(s): He, Pu-Chao; Liao, Xiang-Ru; Zhu, Xin-Chan;
  • Abstract: A cationic peroxidase in leaves of Vitis pseudoreticulata was purified using ion exchange chromatography and on a zeolite column. Characteristics of the purified cationic peroxidase were partially analyzed. The results showed that the cationic peroxidase had a maximum absorbance at ca. 450 nm, a Mr ca. 39000, and a pI more than 8.0. The optimum catalytic pH value was ca. 5.76, when guaiacol was used as substrate. The apparent Vmax and Km was 637 mumol/mg protein/min and 1.02 mmol/l H2O2 respectively. The peroxidase was stimulated by high concentrations of inorganic salts.
  • Publication Date: May 1999
  • Journal: Phytochemistry (Oxford)

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