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Histopathology of Seed-Borne Infections - Applied Research Center ...

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278 <strong>Histopathology</strong> <strong>of</strong> <strong>Seed</strong>-<strong>Borne</strong> <strong>Infections</strong>Pcuticles, 20–21fungi infection, 81–82, 91–92integuments, 31special structures, 21structure and types, 17–20, 19vascular supply, 18, 20viral infection, 205–209Pachychalazal seeds, 31Pantoea spp., 3, 169–170, 173, 190Papaveraceae, 49Papaya, 9, 94Papulaspora coprophila, 105Parasitic fungi, 2Parenchyma invader, 174Parsley, 146Paspalum spp., 70, 87Passiflora, 21, 51Pathogen nature, 82Peabacterial infection, 176basics, 249–251, 250, 252colonization, 110color, 48hollow heart, 253Peanut plants, 173Pear, 110, 171Pearl milletcolonization, 115, 117, 120, 123flowers, 7, 9nonvascular infection, 84stigma and style infection, 87Peas, 244, 251Pea seed-borne mosaic virus (PSbMV), 2, 209,217, 219, 219–220, 221Pedaliaceae, 25, 59, 65–66Penetrationbacterial infection, 169–178fungi, 93–94, 95nematode infection, 229–230ovary infection, 83–91ovules, 81–82pathogen nature, 82threshed seeds, 92–93Penicillium, 92Pennisetum, 70, 73Pepper, 88Pericarp, see <strong>Seed</strong> coatsPerichalazal seeds, 31Peripheral seeds, 53Perisperm, 70Peronosclerospora spp., 84–85, 107, 110–111,112Peronosporaceae, 82Peronospora spp., 107, 110Petal, 10–11Petunia, 16Phaseolus spp.cotyledons, 257embryo, 28histopathology, 3hollow heart, 253ovules, 20viral infection, 221Phoma spp.colonization, 145color, 48ovary and fruit wall infection wall, 90severity <strong>of</strong> infection, 102Phomopsis spp.colonization, 146colonization site, 104micropyle, 51mixed infections, 105ovary and fruit wall infection wall, 90ovule and seed infection, 92seed coat surface, 49Physiogenic and nonpathogenic disordersbasics, 247, 248, 257–258cotyledons, 255, 256, 257hollow heart, 251–253, 254, 255humidity effects, 251–257marsh spot, 249–251, 250, 252mineral deficiency, 249–251necrosis, 255, 256peas, 249–251, 250, 252Phytophthora spp., 107, 109, 110Pigeon pea, 182, 192Piper, 53Piperaceae, 29Pisum, 20, 60Placento-chalazal region, 73Plant part invasion, 170–174Plants, 206–207Plasma membrane, 22Plasmodesmata, 22, 28Plasmopara spp., 85, 107, 110Poa bulbosa, 151Poaceaeembryo, 27, 53endosperm, 25female gametophyte, 22integuments, 31ovules, 17seeds, 2, 47

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