Jasmonic acid transient accumulation is needed for abscisic acid increase in citrus roots under drought stress conditions

Abstract

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Alterations of Endogenous Hormonal Levels in Plants under Drought and Salinity

“…Despite of these fluctuations, in the literature there are numerous studies showing a JAs endogenous increase under abiotic stresses. For example, JA increased in spear tips of Asparagus officinalis [32], Carica papaya seedlings [33], Pinus pinaster plants [34], Oryza sativa leaves and roots [35] and citrumelo CPB 4475 (a commercial citrus rootstock) [36] exposed to drought. Similarly, under salinity, JA increased in salt-tolerant cv HF tomato from the beginning of salinization, while in salt-sensitive cv Pera it decreased after 24 h of treatment [37].…”

Jasmonic acid interacts with abscisic acid to regulate plant responses to water stress conditions

“…Moreover, exogenous treatment with jasmonates increased ABA levels in different Species both under control conditions or exposed to drought. 10,11 The reciprocal treatment with exogenous ABA had no significant effect on endogenous JA levels in citrus plants. 11 In order to understand the effect of JA on plant responses to desiccation, proline accumulation after dehydration was analyzed in different Arabidopsis seedlings: a line defective in JA-Ile biosynthesis (jar1-1), 2 JA insensitive lines (jai1 and coi1-16), and an ABA insensitive line (abi2).…”

Plant strategies to deal with a combination of drought and high temperatures

“…Plant responses to external stimuli are mainly mediated by phytohormones, whose involvement in abiotic stress responses has been deeply studied [9][10][11][12]. Under drought or high salinity, abscisic acid (ABA) seems to be an important stress-signaling hormone [13,14], involved in the regulation of stomatal closure, synthesis of compatible osmolytes and up-regulation of genes leading to adaptive responses.…”

“…In addition, elevated CO 2 levels have been reported to be advantageous when combined with other stresses such as ozone (Ainsworth et al 2008), salt or high light (Pérez-López et al 2013). In tomato plants, a combination of salinity and heat stress enhances the protection against the damaging effects of salinity, suggesting that the accumulation of osmoprotectants such as glycine betaine and trehalose could play an important role 9 suggesting potential targets for the improvement of crop stress tolerance (e.g., Apx1, Mbf1c, At1g26580; Priyanka et al 2010;Wang et al 2010, Kumar et al 2015Suzuki et al 2016;. According to these studies, a combination of abiotic stresses activated specific sets of transcripts that represented new programs of gene expression, providing a molecular explanation for the unique response of plants to simultaneous stresses.…”

“…Several different phytohormones play a pivotal role in the response of plants to abiotic stress (Peleg and Blumwald, 2011;De Ollas et al, 2013;Miura and Tada, 2014;. Abscisic acid (ABA), for example, plays a key role in the response of plants to water deficit, salinity and heat, as it regulates stomatal closure and the expression of different acclimation proteins (Bartels and Sunkar, 2005;Finkelstein, 2013).…”