Race non‐specific resistance of oats to primary infection by mildew

Annals of Applied Biology - Tập 86 Số 1 - Trang 29-36 - 1977
T.L.W. Carver1, Ambrose Carr1
1Welsh Plant Breeding Station, Aberystwyth, Dyfed, SY23 3EB

Tóm tắt

SUMMARYA range of oat species, species hybrids and derived addition lines, varied in their level of race non‐specific resistance to mildew. This resistance prevented attempted primary penetration by a proportion of spores. It was generally expressed more strongly in fifth than in first formed leaves and thus appeared to be a component of adult plant resistance. Penetration was most frequently arrested at the infection peg stage, implicating the papilla formed by the host as a defence mechanism. Epidermal cells close to stomata were more commonly invaded than others, but only in two of ten lines examined was preferential stomatal subsidiary cell infection observed. Where penetration was successful, host resistance could operate by arresting infections prior to the establishment of functional host/pathogen relations. In hybrids between resistant wild species and a susceptible cultivated oat, the level of both forms of resistance was reduced, indicating a similar effect of the susceptible host genome on genes conditioning both resistances.

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Tài liệu tham khảo

Bracker C. E., 1968, Ultrastructure of the haustorial apparatus of Erysiphe graminis and its relationship to the epidermal cell of barley, Phytopathology, 58, 12

10.1139/cjr44c-006

10.1111/j.1469-8137.1935.tb06840.x

10.1094/Phyto-62-401

Graf Marin A., 1934, Studies on powdery mildew of cereals, Memoirs. Cornell University Agricultural Experiment Station, 157, 1

Hayes J. D., 1966, Variation in the pathogenicity of Erysiphe graminis DC. f. sp. avenae, and its relation to the development of mildew‐resistant oat cultivars, Euphytica, 15, 80, 10.1007/BF00024081

Hirata K., 1967, Notes on haustoria, hyphae and conidia of the powdery mildew fungus of barley, Erysiphe graminis f. sp. hordei, Memoirs of the Faculty of Agriculture, Niigata University, 6, 207

10.1016/S0007-1536(52)80008-7

10.1111/j.1744-7348.1971.tb04635.x

10.1111/j.1469-8137.1974.tb04613.x

Masri S. S., 1966, Primary infection of wheat and barley by Erysiphe graminis, Phytopathology, 56, 389

10.1111/j.1469-8137.1905.tb05907.x

10.1139/b58-054

10.1094/Phyto-63-1307

10.1111/j.1744-7348.1950.tb00982.x

Snedecor G. W., 1956, Statistical Methods

Thông tin
Thông tin xuất bản

Annals of Applied Biology

Tập 86 Số 1

29-36

Thông tin tác giả