Artículos de revistas
Constitutive gibberellin response in grafted tomato modulates root-to-shoot signaling under drought stress
Fecha
2018-02-01Registro en:
Journal Of Plant Physiology. Jena: Elsevier Gmbh, Urban & Fischer Verlag, v. 221, p. 11-21, 2018.
0176-1617
10.1016/j.jplph.2017.12.003
WOS:000424760300002
WOS000424760300002.pdf
Autor
Universidade Estadual Paulista (Unesp)
CSIC UPV
Universidade Federal de Minas Gerais (UFMG)
Universidade de São Paulo (USP)
Institución
Resumen
Plants are sessile organisms that must perceive and respond to various environmental constraints throughout their life cycle. Among these constraints, drought stress has become the main limiting factor to crop production around the world. Water deprivation is perceived primarily by the roots, which efficiently signal the shoot to trigger drought responses in order to maximize a plant's ability to survive. In this study, the tomato (Solanum lycopersicum L.) mutant procera (pro), with a constitutive response to gibberellin (GA), and its near isogenic line cv. Micro-Tom (MT), were used in reciprocal grafting under well-watered and water stress conditions to evaluate the role of GA signaling in root-to-shoot communication during drought stress. Growth, oxidative stress, gene expression, water relations and hormonal content were measured in order to provide insights into GA-mediated adjustments to water stress. All graft combinations with pro (i.e. pro/pro, MT/pro and pro/MT) prevented the reduction of growth under stress conditions without a reduction in oxidative stress. The increase of oxidative stress was followed by upregulation of SlDREB2, a drought-tolerance related gene, in all drought-stressed plants. Scions harboring the pro mutation tended to increase the abscisic acid (ABA) content, independent of the rootstock. Moreover, the GA sensitivity of the rootstock modulated stomatal conductance and water use efficiency under drought stress, indicating GA and ABA crosstalk in the adjustment of growth and water economy.