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Abscisic acid mimic-fluorine derivative 4 alleviates water deficit stress by regulating ABA-responsive genes, proline accumulation, CO2 assimilation, water use efficiency and better nutrient uptake in tomato plants
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Advisor(s)
Abstract(s)
Water deficit represents a serious limitation for agriculture and both genetic and
chemical approaches are being used to cope with this stress and maintain plant
yield. Next-generation agrochemicals that control stomatal aperture are
promising for controlling water use efficiency. For example, chemical control
of abscisic acid (ABA) signaling through ABA-receptor agonists is a powerful
method to activate plant adaptation to water deficit. Such agonists are molecules
able to bind and activate ABA receptors and, although their development has
experienced significant advances in the last decade, few translational studies
have been performed in crops. Here, we describe protection by the ABA mimic fluorine derivative 4 (AMF4) agonist of the vegetative growth in tomato plants
subjected to water restriction. Photosynthesis in mock-treated plants is markedly
impaired under water deficit conditions, whereas AMF4 treatment notably
improves CO2 assimilation, the relative plant water content and growth. As
expected for an antitranspirant molecule, AMF4 treatment diminishes stomatal
conductance and transpiration in the first phase of the experiment; however,
when photosynthesis declines in mock-treated plants as stress persists, higher
photosynthetic and transpiration parameters are recorded in agonist-treated
plants. Additionally, AMF4 increases proline levels over those achieved in mock treated plants in response to water deficit. Thus water deficit and AMF4
cooperate to upregulate P5CS1 through both ABA-independent and ABA dependent pathways, and therefore, higher proline levels are produced Finally,
analysis of macronutrients reveals higher levels of Ca, K and Mg in AMF4-compared to mock-treated plants subjected to water deficit. Overall, these
physiological analyses reveal a protective effect of AMF4 over photosynthesis
under water deficit and enhanced water use efficiency after agonist treatment. In
summary, AMF4 treatment is a promising approach for farmers to protect the
vegetative growth of tomatoes under water deficit stress.
Description
Keywords
Abscisic acid Abiotic stress ABA receptor Agonist Proline Transpiration Water use efficiency Tomato . Centro em Agricultura Sustentável e Tecnologia Alimentar
Citation
Jime´ nez-Arias D, Morales-Sierra S, Sua´rez E, Lozano-Juste J, Coego A, Estevez JC, Borges AA and Rodriguez PL (2023) Abscisic acid mimic-fluorine derivative 4 alleviates water deficit stress by regulating ABA-responsive genes, proline accumulation, CO2 assimilation, water use efficiency and better nutrient uptake in tomato plants. Front. Plant Sci. 14:1191967. doi: 10.3389/fpls.2023.1191967
Publisher
Frontiers Media