Abstract
Jasmonates (JAs), such as jasmonic acid and its methyl ester, are lipid-derived compounds with signal functions in plant growth and development, as well as in responses to stress. JAs are widely distributed in plants as natural plant growth regulators. JAs do not work independently but work as a part of a complex signaling network with other phytohormones. They are deployed to induce response during wounding and are often used for elicitation and stimulation of secondary metabolites production in different in vitro culture systems. Application of JAs seems to be promising during different steps of the micropropagation system for different species. JAs stimulate proliferation rate of shoots, roots, callus and induce microtubers and bulblets formation. However, negative effects of JAs on the condition of plant tissues are also reported, e.g. leaf senescence, reduced growth and inhibited somatic embryogenesis. This review summarizes the current knowledge of the application and properties of jasmonates under in vitro conditions in terms of cell division, explant growth, proliferation ability, storage organ formation and stress response.
Highlights
Jasmonates (JAs) are widely distributed in plant tissues with high activity and growth rate, such as the stem tips, root tips, young leaves, flowers and unripe fruits
It is believed that Jasmonic acid (JA) and MeJA represent a separate group of plant growth regulators with hormone-like
The aim of this review is to summarize studies investigating the role of jasmonates in micropropagation, explants growth, storage organ formation and somatic embryogenesis in plants under in vitro conditions
Summary
Jasmonates (JAs) are widely distributed in plant tissues with high activity and growth rate, such as the stem tips, root tips, young leaves, flowers and unripe fruits. Endogenous JAs levels increase in response to the external stimuli, including mechanical damage, pathogen attack and osmotic stress (Sembdner and Parthier 1993; Creelman and Mullet 1995). Jasmonic acid (JA) and its methyl ester (methyl jasmonates, MeJA) are linolenic acid (LA)-derived cyclopentanone-based compounds that belong to oxylipins (Creelman and Mullet 1995). It is believed that JA and MeJA represent a separate group of plant growth regulators with hormone-like. Bioactive form of JAs synthesized by JAR1 (JasmonylL-amino acid synthetase; Fig. 1) is (7S,3R)-JA-Ile perceived by the COI1 receptor (the F-box protein CORONATINE INSENSITIVE 1) (Staswick and Tiryaki 2004; Fonseca et al 2009; Wasternack and Hause 2013; Ueda et al 2020). JAIle binds to the Skp1-Cullin-F-box (SCF)COI1E3 ubiquitin ligase complex which further recruits JAZ
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