Pyracantha

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Laurence Arene - One of the best experts on this subject based on the ideXlab platform.

  • evidence of two formae speciales in venturia inaequalis responsible for apple and Pyracantha scab
    Phytopathology, 2002
    Co-Authors: Bruno Le Cam, Luciana Parisi, Laurence Arene
    Abstract:

    ABSTRACT Genetic relationships, mating crosses, and host specificity of Venturia inaequalis isolates from Malus spp. and of Spilocaea Pyracanthae isolates from Pyracantha spp. were evaluated. Sequence analysis of the complete internal transcribed spacer (ITS) region (ITS1-5.8S to ITS2) revealed a total similarity between these two putative species. ITS restriction fragment length polymorphism carried out with five restriction enzymes on a collection of 28 isolates confirmed a lack of diversity in this region between and within these two populations. Additional isolates from three related species (V. pirina, V. nashicola, and S. eriobotryae) were divided into two distinct monophyletic groups in a phylogenetic tree using ITS sequence comparison. These groups were related to their anamorph (i.e., Spilocaea or Fusicladium). When inoculated on their host of origin, fields isolates caused typical symptoms of scab disease, and a host specificity was demonstrated by cross pathogenicity of isolates from Malus × do...

Duan Yu-feng - One of the best experts on this subject based on the ideXlab platform.

Robert M. Frymire - One of the best experts on this subject based on the ideXlab platform.

  • Effect of uniconazole and limited water on growth, water relations, and mineral nutrition of “Lalandei” Pyracantha
    Journal of Plant Growth Regulation, 1992
    Co-Authors: Robert M. Frymire, Janet C. Henderson-cole
    Abstract:

    Pyracantha ( Pyracantha coccinea M. J. Roem. “Lalandei”) plants were treated with uniconazole at 0.5 mg ai container^−1 as a medium drench, 150 mg ai L^−1 as a foliar spray, or left untreated. Plants from all treatments were placed under three water regimes: drought acclimated, nonacclimated and later exposed to drought, or nonstressed. Acclimated plants were conditioned by seven 4-day stress cycles (water withheld), while nonacclimated were well watered prior to a single 4-day stress cycle at the same time as the seventh drought cycle of acclimated plants. Nonstressed plants were well watered throughout the study. Nonstressed plants had higher leaf water potentials and leaf conductances than acclimated and nonacclimated plants, and transpiration rates were higher in nonacclimated than acclimated plants. Uniconazole did not affect leaf water potential, leaf conductance, or transpiration rate. Acclimated plants had smaller leaf areas and leaf, stem, and root dry weights than nonacclimated or nonstressed plants. Plants drenched with uniconazole had the lowest stem and root dry weights. Acclimated plants also contained higher N concentrations than nonacclimated or nonstressed plants, and higher P concentrations than nonacclimated plants. Uniconazole medium drench treatments increased levels of Mn and P. Calcium concentration was increased in plants receiving either medium drench or foliar applications.

  • Uniconazole effect on growth and chlorophyll content of Pyracantha, photinia, and dwarf Burford holly
    Journal of Plant Growth Regulation, 1992
    Co-Authors: Robert M. Frymire, Janet C. Cole
    Abstract:

    Pyracantha, photinia, and dwarf Burford holly were treated with a uniconazole medium drench at 0, 0.5, 1.0, or 3.0 mg · container^−1 a.i. or a foliar application at the following rates: Pyracantha at 0, 50, 100, or 150 mg · L^−1 a.i.; photinia at 0, 25, 50, or 100 mg · L^−1 a.i.; and holly at 1, 10, 25, or 50 mg · L^−1 a.i. Height, width, leaf area per plant, and dry weights of all species decreased as uniconazole drench rate increased. Foliar applications were less effective than drenches in Pyracantha and photinia, and holly did not respond to the foliar treatment. Chlorophyll content of Pyracantha increased with rate in both application methods. Leaf N, P, and Zn increased in Pyracantha and photinia with increasing medium drench rate, but only P was increased in holly. Zn also increased in Pyracantha and photinia with foliar applications, but only N in photinia and P in Pyracantha increased with increasing uniconazole foliar application rates.

  • EFFECTS OF UNICONAZOLE MEDIA DRENCH TREATMENTS ON WATER RELATIONS AND GROWTH OF 'LALANDEI' Pyracantha
    HortScience, 1992
    Co-Authors: Robert M. Frymire, Janet C. Cole
    Abstract:

    Uniform rooted cuttings of Pyracantha (Pyracantha coccinea M.J. Roem. 'Lalandei') were potted into 3.8 liter containers in a pine bark:sand medium. Plants were treated with a medium drench at 0.5 mg ai per container, or a foliar spray at 150 mg ai per liter, or no uniconazole. Plants also were exposed to one of three irrigation regimes: nonstressed, stressed or acclimated. Uniconazole had little effect on leaf water potential, osmotic potential, transpiration or leaf conductance. The uniconazole drench treatments reduced plant growth and increased N, Ca, and Mn concentrations in the leaves. Foliar applications had less effect on plant growth and elemental content Acclimated and stressed plants had lower water and osmotic potentials, transpiration rates and leaf conductance than nonstressed plants on the final day of the stress cycle. Acclimated plants had higher levels of N and Mn with lower levels of Zn in the leaves than either stressed of nonstressed plants.

B. Le Cam - One of the best experts on this subject based on the ideXlab platform.

  • Host-specific differentiation among populations of Venturia inaequalis causing scab on apple, Pyracantha and loquat
    Fungal genetics and biology : FG & B, 2010
    Co-Authors: Pierre Gladieux, Valérie Caffier, M. Devaux, B. Le Cam
    Abstract:

    Patterns of multilocus DNA sequence variation within and between closely related taxa can provide insights into the history of divergence. Here, we report on DNA polymorphism and divergence at six nuclear loci in globally distributed samples of the ascomycete Venturia inaequalis, responsible for scab on apple, loquat, and Pyracantha. Isolates from different hosts were differentiated but did not form diagnosable distinct phylogenetic species. Parameters of an Isolation-with-Migration model estimated from the data suggested that the large amount of variation shared among groups more likely resulted from recent splitting than from extensive genetic exchanges. Inferred levels of gene flow among groups were low and more concentrated toward recent times, and we identified two potentially recent one-off shifters from apple and Pyracantha to loquat. These findings support a scenario of recent divergence in allopatry followed by introgression through secondary contact, with groups from loquat and Pyracantha being the most recently differentiated.

Janet C. Cole - One of the best experts on this subject based on the ideXlab platform.

  • Uniconazole effect on growth and chlorophyll content of Pyracantha, photinia, and dwarf Burford holly
    Journal of Plant Growth Regulation, 1992
    Co-Authors: Robert M. Frymire, Janet C. Cole
    Abstract:

    Pyracantha, photinia, and dwarf Burford holly were treated with a uniconazole medium drench at 0, 0.5, 1.0, or 3.0 mg · container^−1 a.i. or a foliar application at the following rates: Pyracantha at 0, 50, 100, or 150 mg · L^−1 a.i.; photinia at 0, 25, 50, or 100 mg · L^−1 a.i.; and holly at 1, 10, 25, or 50 mg · L^−1 a.i. Height, width, leaf area per plant, and dry weights of all species decreased as uniconazole drench rate increased. Foliar applications were less effective than drenches in Pyracantha and photinia, and holly did not respond to the foliar treatment. Chlorophyll content of Pyracantha increased with rate in both application methods. Leaf N, P, and Zn increased in Pyracantha and photinia with increasing medium drench rate, but only P was increased in holly. Zn also increased in Pyracantha and photinia with foliar applications, but only N in photinia and P in Pyracantha increased with increasing uniconazole foliar application rates.

  • EFFECTS OF UNICONAZOLE MEDIA DRENCH TREATMENTS ON WATER RELATIONS AND GROWTH OF 'LALANDEI' Pyracantha
    HortScience, 1992
    Co-Authors: Robert M. Frymire, Janet C. Cole
    Abstract:

    Uniform rooted cuttings of Pyracantha (Pyracantha coccinea M.J. Roem. 'Lalandei') were potted into 3.8 liter containers in a pine bark:sand medium. Plants were treated with a medium drench at 0.5 mg ai per container, or a foliar spray at 150 mg ai per liter, or no uniconazole. Plants also were exposed to one of three irrigation regimes: nonstressed, stressed or acclimated. Uniconazole had little effect on leaf water potential, osmotic potential, transpiration or leaf conductance. The uniconazole drench treatments reduced plant growth and increased N, Ca, and Mn concentrations in the leaves. Foliar applications had less effect on plant growth and elemental content Acclimated and stressed plants had lower water and osmotic potentials, transpiration rates and leaf conductance than nonstressed plants on the final day of the stress cycle. Acclimated plants had higher levels of N and Mn with lower levels of Zn in the leaves than either stressed of nonstressed plants.

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