ntrusive cells in the haustoria of Orobanche and Striga push their way through the host epidermis and cortex to reach the host stele (Neumann et al., 1999). Biochemical and histological studies have confirmed the activities of PCWDEs and compositional changes in the host and parasite cell walls (Figure 2). For instance, cellulase, polygalacturonase...
For breaking into plant tissues to acquire nutrients, plant cell wall degrading enzymes (PCWDEs) play important roles in pathogenic fungi, oomycetes, and bacteria (Toth and Birch, 2005; Kämper et al., 2006).
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