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

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Location of Fungal Hyphae in Seeds 113ABscendCembDE F GFIGURE 5.6 Histopathology of Albugo candida-infected Brassica juncea seeds. A, Infectedsymptomatic seeds with white crust on seed surface. B, C, Cleared whole-mount preparationsof epidermis and cotyledon, respectively, showing mycelium and oospores. D, E, Ls part ofbold-discolored seed with mycelium and oospore in seed coat with slight increase in numberof its layers. F, A part of mature seed coat magnified to show oogonium and antheridium.G, Ls part of shriveled discolored seed showing abundant mycelium and oospores in seedcoat. (Abbreviations: emb, embryo; end, endosperm; sc, seed coat.) (Sharma, J., Agarwal, K.,and Singh, D. 1997. J. Phytol. Res. 10: 25–29.)Singh, 1997). The seed-borne mycelium and oospores remain viable and can causeseedling infection (Sharma, Agarwal, and Singh, 1994).5.5.2 ASCOMYCETESTable 5.3 gives an account of Ascomycetes in seeds of crop plants.5.5.2.1 ProtomycesProtomyces macrosporus is the most widespread species causing discoloration andgall formation on members of the Apiaceae (Umbelliferae). Coriandrum sativum is
114 Histopathology of Seed-Borne InfectionsTABLE 5.3Infection of Ascomycetes and Basidiomycetes in Seeds of Crop PlantsPathogenHostPart(s) of Seedand FruitImportantReferencesProtomycesmacrosporusAscomycetesCoriandrum sativum Persistent calyx,stylopodium, pericarp,carpophoreGupta, 1962; Rao, 1972;Pavgi andMukhopadhyay, 1972;Singh et al., 2001Claviceps fusiformis Pennisetum typhoides Seed sclerotia Prakash et al., 1980;Roy, 1984C. paspali Paspalum dilatatum Seed sclerotia Luttrell, 1977C. purpurea Secale secale, Triticum Seed sclerotia Campbell, 1958aestivum, HordeumvulgareDidymella bryoniae Cucurbita pepo Seed coat, embryo Lee, Mathur, andNeergaard, 1984D. lycopersici Lycopersicum Seed coat Fischer, 1954esculentumHelianthus annuus Pericarp, testa Tollenaar and Bleiholder,1971SclerotiniasclerotiorumEruca sativa Seed coat Sharma, 1992BasidiomycetesMelanopsichiumeleusinisEleusine coracana Seed cavity Thirumalachar andMundkur, 1947TolyposporiumpanicillariaePennisetum typhoides Affects all parts exceptpericarpBhat, 1946; Mitter andSiddiqui, 1995Ustilago tritici Triticum aestivum Pericarp, endosperm,embryoBatts, 1955; Popp, 1959;Ohms and Bever, 1956Ustilago nuda Hordeum vulgare Pericarp, endosperm, Malik and Batts, 1960aembryoTilletia controversa Triticum aestivum Colonizes developing Mathur and Cunfer, 1993ovary, affects all partswithin pericarpT. indica(Neovossia indica)Triticum aestivum Partial or completeinfection, all partsGoates, 1988; Cashion andLuttrell, 1988except aleurone layerand pericarpT. laevis (T. foetida) Triticum aestivum Colonizes ovary, affects Singh, 1991all parts except pericarpT. tritici (T. caries) Triticum aestivum Colonizes ovary, affectsall parts except pericarpMathur and Cunfer, 1993Puccinia calcitrapaevar. centaureae(P. carthami)Carthamus tinctoriusUredospore andteleutospore infestationof seed surfaceUromyces betae Beta vulgaris Uredospores in seedballsHalfon-Meiri, 1983Alcock, 1931
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Histopathology ofSeed-Borne Infecti
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PrefaceThe book deals with only one
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The AuthorsDalbir Singh, Ph.D., for
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ContentsChapter 1 Introduction ....
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4.3.2 Routes for Infection from Ova
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8.4 Survival in Seed ..............
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2 Histopathology of Seed-Borne Infe
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4 Histopathology of Seed-Borne Infe
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2Reproductive Structuresand Seed Fo
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Reproductive Structures and Seed Fo
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14 Histopathology of Seed-Borne Inf
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3Structure of SeedsThe seed habit i
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Structure of Seeds 49(1971) of usin
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Structure of Seeds 51is found in as
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Structure of Seeds 53dry seed of Ly
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Structure of Seeds 553.3.2 SEED COA
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Structure of Seeds 57Endosperm: One
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Structure of Seeds 59scendembepsmuA
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Structure of Seeds 61Endosperm: Sca
Page 78 and 79: Structure of Seeds 63Chalaza simple
Page 80 and 81: Structure of Seeds 65stystypmerA Bc
Page 82 and 83: Structure of Seeds 67epsent endCADB
Page 84 and 85: Structure of Seeds 69perhscendembpe
Page 86 and 87: Structure of Seeds 71eposgepi′epo
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Page 90 and 91: Structure of Seeds 75Baker, D.M. an
Page 92 and 93: Structure of Seeds 77Maheshwari Dev
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164 Histopathology of Seed-Borne In
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7Seed Infection by VirusesViruses a
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Seed Infection by Viruses 201TABLE
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Seed Infection by Viruses 205Unlike
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Seed Infection by Viruses 2073. The
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Seed Infection by Viruses 209Wilcox
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Seed Infection by Viruses 213floret
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Seed Infection by Viruses 215ptowvv
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Seed Infection by Viruses 2177.4.2
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Seed Infection by Viruses 219seed(s
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Seed Infection by Viruses 221AMV fo
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Seed Infection by Viruses 223REFERE
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Seed Infection by Viruses 225Hunter
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Seed Infection by Viruses 227Wolf,
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