Cold and water stresses produce changes in endogenous jasmonates in two populations of <Emphasis Type="Italic">Pinus pinaster</Emphasis> Ait |
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Authors: | Hilda Pedranzani Rosario Sierra-de-Grado Ana Vigliocco Otto Miersch Guillermina Abdala |
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Institution: | 1.Departamento de Producción Vegetal y Recursos Forestales,Universidad de Valladolid,Palencia,Espa?a (Becaria Programa Alban de Altos estudios Europeos);2.Universidad Nacional de Río Cuarto,Río Cuarto,Argentina;3.Leibniz Institut für Pflanzenbiochemie,Halle,Germany;4.Universidad Nacional de San Luis,Villa Mercedes, San Luis,Argentina |
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Abstract: | There is considerable evidence suggesting that jasmonates (JAs) play a role in plant resistance against abiotic stress. It
is well known that in Angiosperms JAs are involved in the defense response, however there is little information about their
role in Gymnosperms. Our proposal was to study the involvement of JAs in Pinus pinaster Ait. reaction to cold and water stress, and to compare the response of two populations of different provenances (Gredos and
Bajo Tiétar) to these stresses. We detected 12-oxo-phytodienoic acid (OPDA), jasmonic acid (JA), and the hydroxylates 11-hydroxyjasmonate
and 12-hydroxyjasmonate in foliage and shoots of P. pinaster plants. The response of the Gredos population to cold stress differed from that of Bajo Tiétar. Gredos plants showed a lower
JA-basal level than Bajo Tiétar; under cold stress JA increased twofold at 72 h, while it decreased in Bajo Tiétar plants.
The hydroxylates slightly increased in both populations due to cold stress treatment. Under water stress, plants from Gredos
showed a remarkable JA-increase; thus the JA-response was much more prominent under water stress than under cold stress. In
contrast, no change was found in JA-level in Bajo Tiétar plants under water stress. The level of JA-precursor, OPDA, was very
low in control plants from Gredos and Bajo Tiétar. Under water stress OPDA increased only in plants from Bajo Tiétar. Therefore,
we inform here of a different JAs-accumulation pattern after the stress treatment in P. pinaster from two provenances, and suggest a possible correlation with adaptations to diverse ecological conditions. |
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Keywords: | Cold stress Water stress Conifers Pinus pinaster Jasmonic acid and related compounds Variation between provenances |
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