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  • Articles  (3)
  • clubroot  (2)
  • Bactris gasipaes  (1)
  • Springer  (3)
  • Wiley
  • Wiley-Blackwell
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (3)
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  • Articles  (3)
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  • Springer  (3)
  • Wiley
  • Wiley-Blackwell
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  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Screening of Portuguese cole landraces (Brassica oleracea L.) with Peronospora parasitica and Plasmodiophora brassicae (1993)
    Springer
    Euphytica 67 (1993), S. 135-141 
    Details
    ISSN: 1573-5060
    Keywords: downy mildew ; clubroot ; disease resistance ; Tronchuda cabbage ; Galega kale ; Brassica oleracea ; Peronospora parasitica ; Plasmodiophora brassicae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Forty-four landraces of Portuguese coles (Brassica oleracea L.), representing different morphotypes, were screened at the cotyledon stage for downy mildew resistance, caused by Peronospora parasitica. Two isolates of the pathogen, PHW 630 and PHW 828, were used in the experiment. The mean disease interaction phenotype varied among the landraces. Overall, the Portuguese coles have shown resistance to both isolates, particularly to isolate PHW 828. Some landraces were identified with differential reaction to the two P. parasitica isolates. Some of the Portuguese coles are, therefore, good sources of resistance genes to P. parasitica, and could be used in breeding programs or in the development of a downy mildew host differential set. Among the morphotypes tested, Couve Algarvia (ISA 207), Couve Galega (ISA 243 and 187) and Couve Glória de Portugal (ISA 84) have presented the highest resistance interaction. For the development of host differential sets, the landraces ISA 2 (Penca de Mirandela), ISA 35 (Couve de Valhascos) and ISA 600 (Penca Espanhola) could be further selected for the differentiation of P. parasitica isolates. They are resistant to PHW 828 and susceptible to PHW 643. The same morphotypes and landraces were also screened at the seedling stage for resistance to clubroot, caused by Plasmodiophora brassicae Woron.. Although some variation for resistance could be noticed in some the landraces tested, mainly Galega kale types, none of them presented a sufficient level of resistance as to be directly be useful in breeding for resistance to race 6 of P. brassicae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022736
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  • 2
    Electronic Resource
    Electronic Resource
    Association of RFLP markers with trait loci affecting clubroot resistance and morphological characters in Brassica oleracea L. (1993)
    Springer
    Euphytica 69 (1993), S. 33-44 
    Details
    ISSN: 1573-5060
    Keywords: Plasmodiophora brassicae ; Brassica oleracea ; broccoli ; cauliflower ; clubroot ; restriction fragment length polymorphism ; disease resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Resistance to Plasmodiophora brassicae Wor. race 7, the causal agent of the disease clubroot, was examined in an F2 population of a cross between a clubroot resistant broccoli (Brassica oleracea var. italica) and a susceptible cauliflower (B. oleracea var. botrytis). A genetic linkage map was constructed in the same population based on the segregation of 58 dispersed restriction fragment length polymorphism (RFLP) markers. Associations between the inheritance of RFLP marker genotypes and segregation for disease resistance, morphological and maturity characteristics were examined. For each triat examined, several chromosomal regions marked by RFLP probes appeared to contain trait loci, suggesting that each trait was under polygenic control. RFLP marker linkage to a major factor imparting dominance for clubroot resistance from the broccoli parent was observed in this population. Additionally, RFLP marker linkage to an independently segregating factor contributing clubroot resistance from the cauliflower parent was observed, indicating that it should be possible to use RFLP markers to facilitate selection of transgressive segregants having the combined resistance from both parental sources. In some instances, RFLP markers from the same or closely linked chromosomal regions were associated with both clubroot resistance and morphological traits. Analysis of RFLP marker genotypes at linked loci should facilitate the selection of desired disease resistant morphotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021723
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen use in mixed tree crop plantations with a legume cover crop (2000)
    Springer
    Plant and soil 225 (2000), S. 63-72 
    Details
    ISSN: 1573-5036
    Keywords: agroforestry ; Amazonia ; Bactris gasipaes ; humid tropics ; Pueraria phaseoloides ; root activity ; Theobroma grandiflorum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a multi-strata agroforestry system in central Amazonia, we studied the nitrogen (N) use of two indigenous fruit tree species, Theobroma grandiflorum Willd. (ex Spreng.) K. Schum. (cupuaçu) and Bactris gasipaes Kunth. (peachpalm) for heart of palm production, and a legume cover crop, Pueraria phaseoloides Roxb. (Benth.) (pueraria). 15N was applied at a rate of 1 kg ha−1 twice at the beginning and at the peak of the rainy season, in a split plot design under either cupuaçu, peachpalm or pueraria together with fertilizer N usually applied (95.4 and 42.4 g N tree−1 for cupuaçu and peachpalm, respectively). Plant and soil 15N content and total 15N uptake were measured for 1 year. The highest N uptake by the trees occurred from areas underneath their canopy being more than 70% of their total N uptake. During the dry season, pueraria also took up most of its N (more than 70%) from the area underneath its own canopy. During the rainy season, however, pueraria utilized N from the area under cupuaçu (27–40%) and peachpalm (34–47% of the total N uptake by pueraria). Cupuaçu took up between 12 and 26% of its N from the area covered by pueraria, peachpalm slightly less with 10 to 18% (significant only at the end of the rainy season; P〈0.05). Competition for N uptake between the trees was negligible. The above-ground recovery was highest in cupuaçu (15% of the applied 15N), followed by pueraria (11%) and peachpalm (3%). Pueraria proved to be very important for the N cycling in the mixed tree cropping system recovering most (31%) of the applied 15N in plant and soil in comparison to cupuaçu (20%) and peachpalm (21%). However, the natural 15N abundance of the tree leaves did not show a significant transfer of biologically fixed N2 from pueraria to the trees (P〉0.05) and the cover crop did not improve tree N nutrition. The investigated fruit trees did not benefit from biologically fixed N2 of the legume cover crop due to their low lateral root activity and the high available soil N contents largely being an effect of the amount and placement of mineral fertilizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026580127965
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