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1.
Plant Dis ; 107(8): 2320-2324, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-36647186

RESUMO

Ralstonia pseudosolanacearum, a European Union quarantine organism, was until recently absent in the aquatic environments and outdoor cultivation systems of the region. This bacterium was only sporadically reported in restricted greenhouse cultivation systems in some EU countries. In this paper, we report the first findings of R. pseudosolanacearum (phylotype I) in surface water in two distinct geographic locations in the Netherlands in 2020. In 2021, the population of R. pseudosolanacearum in surface water ranged from 104 to 106 CFU/liter. An inoculum reservoir for R. pseudosolanacearum in these aquatic environments was the wild bittersweet plant where population densities ranged from 105 to 107 CFU/ml concentrated bittersweet extract. The virulence of the R. pseudosolanacearum isolates from surface water and bittersweet was confirmed by a pathogenicity test on Solanum lycopersicum cv. Moneymaker plants, resulting in wilting and necrosis of the plants. Sequence analysis of the egl locus of R. pseudosolanacearum isolates from surface water and bittersweet revealed that these isolates are closely related to R. pseudosolanacearum (phylotype I) isolates found previously in the Netherlands on rose. R. pseudosolanacearum (phylotype I) has a very broad host plant range, including potato, many ornamentals, and other economically important crops. This highlights the risk for various host plants grown in the vicinity of the geographic locations where R. pseudosolanacearum has been found and shows the importance of unraveling the epidemiological parameters of the survival, establishment, and spread of R. pseudosolanacearum in temperate climates.


Assuntos
Ralstonia solanacearum , Solanum lycopersicum , Países Baixos , Ralstonia
2.
Ann Bot ; 91 Spec No: 205-11, 2003 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-12509341

RESUMO

Rumex palustris has the capacity to respond to complete submergence with hyponastic (upward) growth and stimulated elongation of petioles. These adaptive responses allow survival of this plant in habitats with sustained high water levels by re-establishing contact with the aerial environment. Accumulated ethylene in submerged petioles interacts with ethylene receptor proteins and operates as a reliable sensor for the under-water environment. Further downstream in the transduction pathway, a fast and substantial decrease of the endogenous abscisic acid concentration and a certain threshold level of endogenous auxin and gibberellin are required for hyponastic growth and petiole elongation. Interactions of these plant hormones results in a significant increase of the in vitro cell wall extensibility in submerged petioles. Furthermore, the pattern of transcript accumulation of a R. palustris alpha-expansin gene correlated with the pattern of petiole elongation upon submergence.


Assuntos
Reguladores de Crescimento de Plantas/fisiologia , Brotos de Planta/fisiologia , Rumex/fisiologia , Adaptação Fisiológica , Transdução de Sinais , Água
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