Uncovering early response to drought by proteomic, physiological and biochemical changes in the almond × peach rootstock ‘Garnem’
Beatriz Bielsa A , María Á. Sanz B and María J. Rubio-Cabetas A CA Unidad de Hortofruticultura, Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA) – IA2 (CITA-Universidad de Zaragoza), Av. Montañana 930, 50059, Zaragoza, Spain.
B Área de Laboratorios de Análisis y Asistencia Tecnológica, Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA), Av. Montañana 930, 50059, Zaragoza, Spain.
C Corresponding author. Email: mjrubioc@cita-aragon.es
Functional Plant Biology 46(11) 994-1008 https://doi.org/10.1071/FP19050
Submitted: 14 February 2019 Accepted: 15 June 2019 Published: 17 September 2019
Abstract
Drought affects growth and metabolism in plants. To investigate the changes in root protein function involved in the early response to drought stress, a proteomic analysis in combination to a physiological and biochemical analysis was performed in plants of ‘Garnem’, an almond × peach hybrid rootstock, subjected to short-term drought stress. Abscisic acid (ABA) accumulation levels increased during the drought exposure, which induced stomatal closure, and thus, minimised water losses. These effects were reflected in stomatal conductance and leaf water potential levels. However, ‘Garnem’ was able to balance water content and maintain an osmotic adjustment in cell membranes, suggesting a dehydration avoidance strategy. The proteomic analysis revealed significant abundance changes in 29 and 24 spots after 2 and 24 h of drought stress respectively. Out of these, 15 proteins were identified by LC-ESI-MS/MS. The abundance changes of these proteins suggest the influence in drought-responsive mechanisms present in ‘Garnem’, allowing its adaptation to drought conditions. Overall, our study improves existing knowledge on the root proteomic changes in the early response to drought. This will lead to a better understanding of dehydration avoidance and tolerance strategies, and finally, help in new drought-tolerance breeding approaches.
Additional keywords: abscisic acid, drought tolerance, proteomics, Prunus, water stress.
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