Activation of Teliospore Germination in Uromyces appendiculatus var. appendiculatus1)

Gold, R. E.; Mendgen, Kurt

doi:10.1111/j.1439-0434.1983.tb00589.x

Cited by 19 publications

(21 citation statements)

References 17 publications

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“…Teliospores were produced, stored. and induced to germinate according to methods outlined previously (Gold 1983;Gold and Mendgen 1983a). …”

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confidence: 99%

Cytology of basidiospore germination, penetration, and early colonization of Phaseolus vulgaris by Uromyces appendiculatus var. appendiculatus

Gold¹,

Mendgen²

1984

Can. J. Bot.

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GOLD, R. E., and K. MENDGEN. 1984. Cytology of basidiospore germination, penetration, and early colonization of Phaseolus vulgaris by Uromyces appendiculatus var. appendiculatus. Can. J. Bot. 62: 1989Bot. 62: -2002. Cytological studies were done on a compatible interaction between Phaseolu.\ vulgaris and Uromyces appendiculatus var. appendiculatus. The cytoplasm of germinated basidiospores contained numerous microbodies in close association with lipid bodies. vacuoles, and endoplasmic reticulum. A single, polar germ tube commonly developed from a germinating basidiospore. The germ tubes tended to grow toward or along the junction lines between host epidermal cells. Appressorium formation in ca. 75% of all observations occurred less than 3.5 fLm away from the lines of juncture. A mucilaginous exudate was associated with germ tubes and appressoria along areas of contact between host and fungus. Epidermal wall papillae were often observed beneath basidiospores and appressoria but did not restrict entrance of the fungus. The fungus directly penetrated the epidermal cell and invaginated the host plasma membrane. The apex of the penetration peg expanded to form an ovate intraepidermal vesicle. Electron-opaque material occluded the penetration pore after migration of the usually binucleate protoplast into the vesicle. The intraepidermal vesicle developed apically and formed a multicellular primary hypha that initially was multinucleate and later became uninucleate or binucleate. jonction entre les cellules epidermiques de I'h6te. La formation d'appressorium dans ca. 75% de toutes les observations ont lieu amoins de 3.5 fLm des Iignes de jonction. Un exsudat mucilagineux est associe al'hyphe germinatif et aux appressoriums le long des surfaces de contact entre I'h6te et le champignon. Les papilles des parois epidermiques s'observent souvent sous les basidiospores et les appressoriums mais n'empechent pas l'entree du champignon. Le champignon penetre directement la paroi epidermique et invagine la plasmalemme de I'h6te. L'apex de l'hyphe de penetration se gontle pour former une vesicule intraepidermique ovoi'de. Un materiel opaque aux electrons obstrue le pore de penetration apres la migration du protoplaste usuellement binuclee dans la vesicule. La vesicule intraepidermique se developpe de fa<;on apicale et forme un hyphe multicellulaire primaire qui est multinuclee au depart et plus tard devient uninuclee ou binuclee. L'hyphe primaire se developpe alors dans les cellules epidermiques adjacentes soutendant les cellules du parenchyme palissadique et tapissant les espaces intercellulaires.[Traduit par le journal] Introduction Early studies of host penetration by rust basidiospore germlings were done by DeBary (\863), Reess (1870), Rathay (\881), Ward (\888), Fischer (\898), Eriksson (\911), Robinson (1913), and Waterhouse (\921). Ruth Alien later confirmed and expanded these initial studies with detailed descriptions and illustrations of basidiospore-derived rust infections (1930, 1932a, 1932b, 1934, 1935). Parallel to A...

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“…Teliospores were produced, stored. and induced to germinate according to methods outlined previously (Gold 1983;Gold and Mendgen 1983a). …”

mentioning

confidence: 99%

Cytology of basidiospore germination, penetration, and early colonization of Phaseolus vulgaris by Uromyces appendiculatus var. appendiculatus

Gold¹,

Mendgen²

1984

Can. J. Bot.

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“…However, many more chemically unrelated compounds were also shown to have stimulatory effects (French 1992). There is also evidence for exogenous stimulators and inhibitors produced by the host plant which might contribute to the regulation of germination (Gold and Mendgen 1983;Staples and Hoch 1997). Mendgen et al (2006) were able to show that U. fabae stimulates the emission of specific volatiles by its host which in turn control the differentiation of infection structures ( Fig.…”

Section: Features Of Urediospore Infectionmentioning

confidence: 99%

The Uredinales: Cytology, Biochemistry, and Molecular Biology

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“…8, inset). The invaginated Primary leaves of Phaseolus vulgaris L. were inoculated with basi· plasma membrane was designated the extrahyphal membrane diospores as described by Gold (1983) and Gold and Mendgen (1984).…”

Section: Methodsmentioning

confidence: 99%

Vegetative development of Uromyces appendiculatus var. appendiculatus in Phaseolus vulgaris

Gold¹,

Mendgen²

1984

Can. J. Bot.

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GOLD, R. E., and K. MENDGEN. 1984. Vegetative development of Uromyces appendiculatus var. appendiculatus in Phaseolus vulgaris. Can. J. Bot. 62: 2003Bot. 62: -2010. The morphology of intercellular and intracellular hyphae derived from basidiospores of Uromyces appendiculatus var. appendiculatus is described. Light and electron microscopic observations of the bean tust fungus were made on susceptible leaves of Phaseolus vulgaris from 3 to 10 days after inoculation. Following egress from invaded epidermal and palisade parenchyma cells, the fungus grew rapidly and developed extensive intercellular mycelium. An amorphous to fibrillar extracellular matrix was deposited between fungal and host cell walls. Intercellular hyphae grew c10sely appressed to the mesophyll cells and penetrated them to form intracellular hyphae from either a terminal or nonterminal mother cell. Intracellular hyphae were fingerlike, sometimes septate, and generally remained terminal in the invaded mesophyll cell. Occasionally the fungus exited the cell to become an interc.ellular hypha or an intracellular hypha in an adjacent host cell. The plant rarely exhibited a resistantlike reaction at sites of penetration into mesophyll cells.

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Activation of Teliospore Germination in Uromyces appendiculatus var. appendiculatus¹)

Abstract: Abstract·The effects of light and host volatiles on teliospore germination in Uromyces appendiculatus var. appendiculatus were studied.

Cited by 19 publications

References 17 publications

Cytology of basidiospore germination, penetration, and early colonization of Phaseolus vulgaris by Uromyces appendiculatus var. appendiculatus

Cytology of basidiospore germination, penetration, and early colonization of Phaseolus vulgaris by Uromyces appendiculatus var. appendiculatus

The Uredinales: Cytology, Biochemistry, and Molecular Biology

Vegetative development of Uromyces appendiculatus var. appendiculatus in Phaseolus vulgaris

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