Exploring Jasmonates in the Hormonal Network of Drought and Salinity Responses

Abstract

Present and future food security is a critical issue compounded by the consequences of climate change on agriculture. Stress perception and signal transduction in plants causes changes in gene or protein expression which lead to metabolic and physiological responses. Phytohormones play a central role in the integration of different upstream signals into different adaptive outputs such as changes in the activity of ion-channels, protein modifications, protein degradation, and gene expression. Phytohormone biosynthesis and signaling, and recently also phytohormone crosstalk have been investigated intensively, but the function of jasmonates under abiotic stress is still only partially understood. Although most aspects of jasmonate biosynthesis, crosstalk and signal transduction appear to be similar for biotic and abiotic stress, novel aspects have emerged that seem to be unique for the abiotic stress response. Here, we review the knowledge on the role of jasmonates under drought and salinity. The crosstalk of jasmonate biosynthesis and signal transduction pathways with those of abscisic acid (ABA) is particularly taken into account due to the well-established, central role of ABA under abiotic stress. Likewise, the accumulating evidence of crosstalk of jasmonate signaling with other phytohormones is considered as important element of an integrated phytohormonal response. Finally, protein post-translational modification, which can also occur without de novo transcription, is treated with respect to its implications for phytohormone biosynthesis, signaling and crosstalk. To breed climate-resilient crop varieties, integrated understanding of the molecular processes is required to modulate and tailor particular nodes of the network to positively affect stress tolerance.

Consequences of Sphaeropsis tip blight disease for the phytohormone profile and antioxidative metabolism of its pine host

“…inoculated with the necrotrophic fungus Grosmannia clavigera (Arango‐Velez et al, ). Obviously, the phytohormone defence network of pines shows similar responses to drought stress (Riemann et al, ) and invasion by fungi such as S. sapinea , which is in line with our hypothesis (iii).…”

The Histone Deacetylase Inhibitor Suberoylanilide Hydroxamic Acid Alleviates Salinity Stress in Cassava

“…AOC regulates a crucial step in JA biosynthesis, and the JA derivative, MeJA, alleviates salt stress in soybean (Yoon et al, 2009). The constitutive expression of AOCs can confer salinity tolerance to plants such as tobacco cell lines (Yamada et al, 2002) and wheat (Zhao et al, 2014), and references for the involvement of JA in environmental stresses can be found in Riemann et al (2015). In light of these findings, it is highly possible that overexpression of MeAOC4 contributes to increased tolerance to salt stress under SAHA treatment in cassava.…”

Linking Dynamic Phenotyping with Metabolite Analysis to Study Natural Variation in Drought Responses of Brachypodium distachyon

“…In some studies, JA seems to improve drought tolerance while in others it has been reported to cause a reduction in growth and yield (Riemann et al, 2015). Interestingly, JA was one of the five metabolites contributing to the discrimination between TOL and SUS/INT under mild stress.…”