Response of tomato-pseudomonas pathosystem to mild heat stress
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comunitat-uji-handle2:10234/2508
comunitat-uji-handle3:10234/6999
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Title
Response of tomato-pseudomonas pathosystem to mild heat stressAuthor (s)
Date
2022ISSN
2311-7524Bibliographic citation
Scalschi, L.; Fernández-Crespo, E.; Pitarch-Marin, M.; Llorens, E.; González-Hernández, A.I.; Camañes, G.; Vicedo, B.; García-Agustín, P. Response of Tomato-Pseudomonas Pathosystem to Mild Heat Stress. Horticulturae 2022, 8, 174. https://doi.org/ 10.3390/horticulturae8020174Type
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Abstract
Higher plants suffer from mild heat stress when temperatures increase by 5 ◦C above
optimum growth temperatures. This produces changes at the cellular and metabolic levels, allowing
plants to adapt to heat conditions. ... [+]
Higher plants suffer from mild heat stress when temperatures increase by 5 ◦C above
optimum growth temperatures. This produces changes at the cellular and metabolic levels, allowing
plants to adapt to heat conditions. This study investigated an increase of 5 ◦C above the optimum
growth temperature (26 ◦C) of tomato plants in the tomato—Pseudomonas syringae pv. tomato
pathosystem. A temperature increase above 26 ◦C affects plant development, the defensive pathways
activated against Pseudomonas syringae pv. tomato strain DC3000 (PstDC3000), and the bacterial
growth and virulence machinery. The results demonstrated that tomato plants were able to acclimate
to mild heat stress, showing no symptoms of damage. Moreover, plants subjected to a 5 ◦C increase
(T31 ◦C plants) showed higher basal levels of metabolites such as proline and putrescine, which
probably act as compatible osmolytes. This demonstrates their importance as key components of
thermotolerance. When grown under mild heat stress, plants were less susceptible to PstDC3000
and showed increased accumulation of abscisic acid, jasmonic acid-isoleucine, and spermine. In
addition, the temperature increase negatively affected the infectivity of PstDC3000. Inhibition of the
genes responsible for quorum sensing establishment and synthesis of flagellin and coronatine was
observed in bacteria extracted from T31 ◦C plants. Analysis of the genes involved in the synthesis of
the type III secretion system indicates the important role of this system in bacterial growth under
these conditions. As the known resistance mechanisms involved in the defense against PstDC3000
were not activated, the changes in its virulence mechanisms under high temperatures may explain
the lower infection observed in the T31 ◦C plants. [-]
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