Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effects of pre- and post-inoculation photoperiod on the severity of Melampsora medusae leaf rust of Populus species (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 32 (1983), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Disease severity, based on six parameters (time from inoculation to flecking, and eruption of uredinia, uredinial density and the amounts of urediniospoies produced), was assessed on leaf discs cut from four cultivars of Populus spp. raised with either a long (15 h) or a short (10 h) photoperiod. The discs were inoculated with race 4 of Melampsora medusae and subsequently incubated with either a long (15 h) or a short (10 h) photoperiod. While disease severity, based on most parameters, was lower in discs from the continuing long photoperiod (15 h pre- and 15 h post-inoculation) than from the continuing short photoperiod (10 h pre- and 10 h post-inoculation), maximum severity was developed by discs given a combination of a short pre- and a long post-inoculation photoperiod. The relative contribution of the cultivar, the pre- and the post-inoculation photoperiod and their second- and third-order interactions to variation in disease severity depended on the parameter employed to assess severity. The parameters used are elements of disease monocycles and their possible significance in modelling epidemics is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1983.tb01311.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Comparative study of methods for the quantification of fungal spores at the leaf surfaces ofPopulus xeuramericana (1985)
    Springer
    Plant and soil 85 (1985), S. 447-449 
    Details
    ISSN: 1573-5036
    Keywords: Leaf impressions ; Leaf prints ; Leaf washings ; Melampsora medusae ; Pestalozzia sp. ; Phylloplane ; Populus xeuramericana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The removal of fungal spores, urediniospores ofMelampsora medusae and conidia ofPestalozzia sp., from the leaf surfaces ofPopulus xeuramericana (Dode) Guinier cv. I-488 was assessed using three cultural techniques conventionally employed in phylloplane studies. The method of removal and the original density of spore deposition, but not the interaction of these factors, were significant determinants of variability in spore removal. Irrespective of the original density of deposition, the leaf print method was the most, and the leaf washing technique the least, efficient means of spore removal from the leaf surface. Factors which could contribute to this difference in efficiency are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220201
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The effect of pre- and post-inoculation temperature on resistance in certain cultivars of poplar to races of Melampsora larici-populina kleb. (1981)
    Springer
    Euphytica 30 (1981), S. 113-120 
    Details
    ISSN: 1573-5060
    Keywords: Populus spp. ; poplar leaf rust ; Melampsora larici-populina ; aggressiveness of races ; race-specific resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Four cultivars of Populus spp., compatible to varying degrees with four races of M. larici-populina Kleb., were raised in a controlled environment on a high (28°/20°C, day/night) and low (20°/10°C) temperature regime. Leaf discs cut from the plants were inoculated separately with four individual races of M. laricipopulina and subsequently incubated at either low (20°C) or high (25°C) temperature for 14 days when disease development on the discs was assessed using three parameters (Incubation period to flecking, uredia per leaf disc and uredospores per mm2). The degree of resistance in all cultivar/race combinations was high on cultivars cultured at a high temperature regime compared to those cultured on a low temperature regime. Analysis of variance demonstrated that the major components: pre-inoculation temperature regime, post-inoculation temperature regime, race and cultivar, and most second and third order interactions between these were highly significant (P〈0.001) for most disease parameters. The variance of the temperature components and all interactions involving these were usually higher than those for the cultivar and race components and those interactions lacking temperature components. These results emphasize the importance of the temperature regime at which plants are raised and the temperature of incubation, following the inoculation in determining the relative degree of resistance of these cultivars of poplar to races of M. larici-populina. The implications of these results in the epidemiology of leaf rust and the stability of the host-parasite relationship are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033666
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Reactions of poplar clones to physiologic races of Melampsora larici-populina Kleb. (1980)
    Springer
    Euphytica 29 (1980), S. 401-407 
    Details
    ISSN: 1573-5060
    Keywords: Populus spp. ; leaf rust of poplar ; Melampsora larici-populina ; aggressiveness of races ; gene-for-gene ; integrated concept of resistance ; physiologic specialization ; race-specific ; vertical resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Four mono-uredospore isolates of Melampsora larici-populina Kleb. produced qualitatively distinct reactions on four half-sib clones of Populus deltoides Marsh. and thus were recognisable as races. Two of the races could be distinguished equally readily by the distinctness of their reactions (three quantitative parameters) on four compatible clones of Populus spp. The pronounced race specific reactions of the clones of P. deltoides, allied to the less distinct, but nevertheless race specific reactions, of the compatible clones are consistent with an integrated rather than a disjunctive concept of resistance in Populus spp. to M. larici-populina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025139
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Reaction of cultivars of populus spp. to radiation induced virulent mutants of melampsora medusae (1985)
    Springer
    Euphytica 34 (1985), S. 309-315 
    Details
    ISSN: 1573-5060
    Keywords: Populus spp ; poplar ; Melampsora medusae ; poplar leaf rust ; aggressiveness ; resistance ; differential interaction ; mutation ; virulence ; avirulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Infection Type (IT) and Uredinial Number per Leaf Disk (ULD), induced on eleven cultivars of poplar in vitro, were employed to compare five radiation induced, mono-uredinial mutant lines of Melampsora medusae Thum. with the wild type race 5A from which they were derived. IT produced by the mutants was higher than (eight cultivars), similar to (two cultivars) and pronouncedly less than (IT from 4 to 1 in P. deltoides cv. 7–2) that of race 5A. Although the five mutants produced a uniform IT within a particular cultivar. ULD varied significantly between mutants on individual cultivars and there was a significant differential interaction of the mutant lines with cultivars. The ranking of mutant lines for aggressiveness on cultivars was not consistent while the differences among the mutants in mean ULD over all cultivars were not associated with the dosage level of irradiation from which they were isolated. The implications of the results in the interaction of leaf rust with poplar cultivars are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022924
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Temperature-light effects on resistance of poplar cultivars to Melampsora medusae Thüm (1983)
    Springer
    Euphytica 32 (1983), S. 111-120 
    Details
    ISSN: 1573-5060
    Keywords: Populus deltoides ; P. × euramericana ; poplar ; races of Melampsora medusae ; resistance of cultivars ; aggressiveness of races
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of combinations of post-inoculation temperature (15, 25°C) and light intensity (100, 500, 1000 μEm-2s-1) on disease severity (three parameters), induced by six races of Melampsora medusae in four cultivars of Populus were assessed in a factorial experiment. While all cultivars were immune when incubated at 25°C and 1000 μEm-2s-1, most were susceptible, to varying degrees at all other temperature/light intensity combinations. Although the relative rating for disease severity of cultivar/race combinations depended to a degree on the parameter used for assessment, the temperature of incubation, irrespective of the parameter, was the most important determinant of variation in severity. All the major variables, and their two-and three-way interactions, were significant determinants of variation in number of uredinia developed per unit leaf area. The ranking of cultivars for relative resistance, and of races for relative aggressiveness, depended on the temperature/light intensity treatment during incubation. The lability to environment, of the cultivar/race reactions in this pathosystem, could contribute to stability in resistance to leaf rust in plantations of poplar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036870
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...