New evidence of intra-race diversity in Fusarium oxysporum f. sp. dianthi populations based on Vegetative Compatibility Groups     

Carmen Gómez-Lama Cabanás  Encarnación Pérez-Artés 《European journal of plant pathology / European Foundation for Plant Pathology》2014,139(3):445-451

Fusarium oxysporum f. sp. dianthi (Fod) causes vascular wilt, the most important carnation disease worldwide. We have analyzed vegetative compatibility in a collection of Fod isolates, obtained from both soils and carnation plants in the most important growing areas in Spain, by pairing all isolates in all possible combinations. Results showed that isolates of race 1 and race 2 were distributed among three Vegetative Compatibility Groups (VCG) which correlated with the molecular Groups previously described. Isolates of race 1 and race 2 in molecular Group I grouped in VCG 0021, isolates of race 1 type were in VCG 0022, and isolates of race 1 and race 2 in molecular Group II constituted a new VCG (002-), not previously reported. Isolates in each VCG contained the same mating type gene (MAT1-1 or MAT1-2), with the exception of the new VCG 002- that contained both idiomorphs. This work identifies a new VCG in Fod populations and reports for the first time the presence of isolates of race 1 and race 2 in the same VCG.  相似文献   

Striking genetic similarity between races of Fusarium oxysporum f. sp. ciceris confirms a monophyletic origin and clonal evolution of the chickpea vascular wilt pathogen     

Jill E. Demers  Carla D. Garzón  María del Mar Jiménez-Gasco 《European journal of plant pathology / European Foundation for Plant Pathology》2014,139(2):303-318

  相似文献   

Thermal time requirements of root-knot nematodes on zucchini-squash and population dynamics with associated yield losses on spring and autumn cropping cycles     

María Dolores Vela  Ariadna Giné  Manuel López-Gómez  Francisco Javier Sorribas  Cesar Ornat  Soledad Verdejo-Lucas  Miguel Talavera 《European journal of plant pathology / European Foundation for Plant Pathology》2014,140(3):481-490

The present research was undertaken to evaluate the effects of soil temperature on the life cycle of root-knot nematodes (RKN) on zucchini-squash in growth chambers and to assess the relationship between Meloidogyne incognita soil population densities at planting (Pi), its multiplication rate, and crop losses of zucchini in field conditions. Thermal requirements for M. incognita and M. javanica were determined by cultivating zucchini plants in pots inoculated with 200 second stage juveniles (J2) of each Meloidogyne species at constant temperatures of 17, 21, 25, and 28 °C. Number of days from nematode inoculation until appearance of egg laying females and until egg hatching were separately recorded. For life cycle completion, base temperatures (Tb) of 12?ºC and 10.8?ºC and accumulated degree-days above Tb (S) of 456 and 526, were estimated for M. incognita and M. javanica, respectively. The relationship between fruit weight and M. incognita Pi fits the Seinhorst damage function, but differed accordingly to the cropping season, spring or autumn. Tolerance limits for M. incognita on zucchini were 8.1 J2 per 250 cm³ of soil in spring and 1.5 in autumn cropping cycles, and the minimum relative yields were 0.61 in spring and 0.69 in autumn. Zucchini-squash was a poorer host for M. incognita in spring than in autumn, since maximum multiplication rates (a) and equilibrium densities (E) were lower in spring (a?=?16–96; E?=?274–484) than in autumn (a?=?270–2307; E?=?787–1227).  相似文献   

Suppression of Botrytis cinerea on necrotic grapevine tissues by early‐season applications of natural products and biological control agents     

Carlos Calvo‐Garrido  Inmaculada Viñas  Philip AG Elmer  Josep Usall  Neus Teixidó 《Pest management science》2014,70(4):595-602

  相似文献   

Thermal requirements and population dynamics of root‐knot nematodes on cucumber and yield losses under protected cultivation     

A. Giné  M. López‐Gómez  M. D. Vela  C. Ornat  M. Talavera  S. Verdejo‐Lucas  F. J. Sorribas 《Plant pathology》2014,63(6):1446-1453

Several studies were carried out to determine (i) thermal requirements for development, egg production and emergence of juveniles, and completion of the life cycle of Meloidogyne incognita and Meloidogyne javanica on cucumber, (ii) the maximum multiplication rate and the equilibrium density of root‐knot nematodes on cucumber and yield losses in pot and plastic greenhouse experiments, and (iii) the relationships between relative leaf chlorophyll content (RLCC) and relative cucumber dry top weight biomass (RDTWB) in relation to increasing nematode densities at planting (P_i) in pot experiments. Thermal requirements of M. incognita and M. javanica on cucumber did not differ, irrespective of the biological stage. In the pot experiments, M. javanica completed one generation. The maximum multiplication rate (a) was 833, and the equilibrium density (E) varied according to the effective inoculum densities. The relationship between RDTWB and P_i fitted the Seinhorst damage function model. The RLCC value at 40 or 50 days post‐inoculation also fitted the damage model and was related to RDTWB. In greenhouse experiments, conducted from 2009 to 2012, M. incognita completed three generations. The values for a and E were 1147 and 625 second stage juveniles (J2) per 250 cm³ soil, respectively. The tolerance limit was below zero, and the minimum relative yield ranged from 0·12 to 0·34.  相似文献   

Stage‐specific insecticidal characteristics of a nucleopolyhedrovirus isolate from Chrysodeixis chalcites enhanced by optical brighteners     

Alexandra Bernal  Oihane Simón  Trevor Williams  Primitivo Caballero 《Pest management science》2014,70(5):798-804

  相似文献   

Potential secondary inoculum sources of Botrytis cinerea and their influence on bunch rot development in dry Mediterranean climate vineyards     

Carlos Calvo‐Garrido  Josep Usall  Inmaculada Viñas  Philip AG Elmer  Elena Cases  Neus Teixidó 《Pest management science》2014,70(6):922-930

  相似文献   

Biotechnology of the multipurpose tree species Arbutus unedo: a review     

Jo?o Martins  Glória Pinto  Jorge Canhoto 《林业研究》2022,(2):377-390

Arbutus unedo L. (strawberry tree, Ericaceae) is a woody species with a circum-Mediterranean distribu-tion. It has considerable ecological relevance in southern...  相似文献   

Phenotypic diversity within native Iranian almond (<Emphasis Type="Italic">Prunus</Emphasis> spp.) species and their breeding potential     

K. Sorkheh  B. Shiran  V. Rouhi  E. Asadi  H. Jahanbazi  H. Moradi  T. M. Gradziel  P. Martínez-Gómez 《Genetic Resources and Crop Evolution》2009,56(7):947-961

A total of 137 accessions from 18 wild almond species were collected from Iran and leaf and fruit traits were characterized. Also evaluated were flowering and ripening date, self-incompatibility and kernel bitterness. An extensive phenotypic diversity was found both among and within species. Differences in average leaf dimensions among and within species were associated with average rainfall but not altitude of collection site. Adjacent accessions located in drier areas had smaller leaf dimensions than those located in semi-humid or humid regions. No relation was found between average fruit dimensions and collection site conditions. Principal component analysis revealed that the nut weight and width, and the kernel weight had highest loading in the first component accounting for 45.8% of total variation. In contrast, leaf traits in the second component accounted for 22.3% of total variation. No significant correlations were detected between leaf dimensions and fruit traits in all species evaluated. Results document a rich source of new germplasm for almond improvement programs. Small fruit size, pollen-pistil self-incompatibility, and bitter kernel flavour are the most common obstacles to the utilization of this wild germplasm in breeding.  相似文献   

Mercury in Biota and Surficial Sediments from Coatzacoalcos Estuary, Gulf of Mexico: Distribution and Seasonal Variation     

Jorge Ruelas-Inzunza  Federico Páez-Osuna  Nydia Zamora-Arellano  Felipe Amezcua-Martínez  Humberto Bojórquez-Leyva 《Water, air, and soil pollution》2009,197(1-4):165-174

Variation of mercury (Hg) in sediments and biota from Coatzacoalcos estuary during the dry, rainy and windy seasons was estimated. In sediments, Hg concentrations ranged from 0.07 μg g^?1 in site 13 (Ixhuatepec) located upstream, to 1.06 μg g^?1 in site 3 (Coatzacoalcos river), located in the industrialized area. Highest enrichment factor (EF) and index of geoaccumulation (I _geo) in surficial sediments were 53 and 5.1 respectively. From EF and I _geo, it is considered that Coatzacoalcos estuary is from moderately contaminated to contaminated. In most fish species from Coatzacoalcos estuary, the sequence of Hg concentration was liver>muscle>gills. Average Hg concentrations in soft tissue of bivalves ranged from 0.09 μg g^?1 in Corbicula fluminea to 0.18 μg g^?1 in Polymesoda caroliniana. Biota-sediment accumulation factor (BSAF) ranged from 0.9 in P. caroliniana during the rainy season (site 4) to 3.8 in P. caroliniana from the same site during the windy season.  相似文献