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- W2007716862 abstract "Light and electron microscope studies were made on broad bean leaves undergoing resistant and susceptible reactions to infection with Botrytis spp. Following penetration of the abaxial cuticle, hyphae of each species expanded within swollen epidermal cell walls. Hyphae produced by the non-pathogens B. cinerea, B. elliptica and B. tulipae, and also the pathogen B. fabae when inoculum droplets contained < 10 spores, were confined to the walls of epidermal cells and the cytoplasm of the hyphae became increasingly vacuolated and disorganized between 1 and 3 days after inoculation. In epidermal cells with swollen walls, the cytoplasm became extensively vesiculated and finally collapsed into the centre of the cell lumen. Degradation and swelling of epidermal cell walls clearly preceded cell death at all stages of infection. Swelling of the walls of mesophyll cells was less pronounced, particularly at thelater stages of infection, but degeneration of the cytoplasm of such cells rarely occurred without conspicuous wall degradation. During resistant reactions, living cells at the live/dead cell interface, in the epidermis or mesophyll, contained numerous groups of Golgi bodies and mitochondria and parallel arrays of rough endoplasmic reticulum. This type of “activated” cell was rarely observed during the development of spreading lesions caused by B. fabae (c. 200 conidia per droplet). In the susceptible reaction, hyphae rich in organelles but containing few multivesicular bodies, ramified through swollen epidermal walls and subsequently spread intercellularly through the mesophyll. Hyphae were rarely observed within mesophyll cells but occasionally grew between cells following degradation of their common middle lamella. Intercellular hyphae were often surrounded by fibrillar material which adhered to plant cell walls. After 3 days B. fabae had grown through palisade tissues and was growing within the swollen walls of the adaxial epidermis. Degradation and swelling of plant cell walls appeared to precede cell death in advance of colonization by B. fabae. The possible roles of cell wall degrading enzymes and non-enzymic toxins in causing plant cell death are discussed." @default.
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- W2007716862 date "1981-07-01" @default.
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- W2007716862 title "The ultrastructure of interactions between Botrytis species and broad bean leaves" @default.
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