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  • Hordeum vulgare  (1)
  • Triticum spp.  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Evaluation of germplasm response to septoria leaf blotch of wheat (1983)
    Springer
    Euphytica 32 (1983), S. 439-446 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Triticum spp. ; wheat ; disease severity ; heading date ; plant height ; Septoria Progress Coefficient ; Septoria tritici
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary The relationships between disease severity (percent pycnidia of Septoria tritici on the four uppermost leaves) and the vertical disease placement expressed as the ratio between disease height (cm)/plant height (cm), (referred to as SPC (Septoria Progress Coefficient)), and between maturity level (days to heading) and SPC, were evaluated for 9500 wheat and triticale accessions tested in field trials during 1977–1981. The relation between disease severity and SPC fitted a quadratic equation in which four distinct cutivar response classes were categorized: A) PCD (percent disease)≤15.0/SPC≤0.400 (highly resistant cultivars); B) PCD≤15.0/SPC (0.400–0.650) (moderately resistant); C) PCD (15.0–40.0)/SPC (0.400–0.700) (moderately susceptible); and D) PCD≥40.0/SPC〉0.700 (highly susceptible cultivars). It is suggested that cultivars assigned to classes B and C which exhibit low receptivity and moderate to high vertical pathogen placement differ in nature and type of protection from that expressed by the highly resistant cultivars in class A. Representative cultivars belonging to each of the classes are listed together with their agronomic characteristics (plant height and maturity level).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00021453
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A new virulent strain of Puccinia hordei (1978)
    Springer
    Euphytica 27 (1978), S. 185-189 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Puccinia hordei ; brown barley leaf rust ; Ornithogalum sp. ; alternate host ; Hordeum vulgare ; barley
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Four cultures of Puccinia hordei isolated from the alternate Ornithogalum hosts in Israel were virulent on seedlings of barley cultivars carrying resistance genes Pa, Pa2, Pa2 + Pa5, Pa2 + Pa6, Pa3, Pa4, and Pa7. Cultures with such a spectrum of virulence have never been reported. The cultures remained stable through 20 successive inoculation and isolation cycles. One of the cultures, T-40SS, retained its specific virulence after selfing on the alternate host. The evolution of virulent races of obligate parasites in the centers of origin of their hosts is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00039134
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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