Abstract
The effect of methyl jasmonate (MJ) vapors on the composition and peroxidation of major fatty acids in the organs of common buckwheat seedlings was investigated. The composition of fatty acids in the hypocotyl and cotyledons of seedlings changed significantly under exposure to MJ vapors in closed jars. Four-day exposure to MJ led to a significant reduction in the concentrations of stearic, linoleic, and linolenic acids in the hypocotyl, whereas oleic acid levels increased approximately 3.5-fold. A decrease in stearic acid levels and an increase in the content of linolenic acid were noted in cotyledons, whereas oleic acid levels decreased in roots. Seven-day exposure to MJ vapor caused a further reduction in stearic acid content and an increase in oleic acid and linoleic acid levels in the hypocotyl. At the same time, the linoleic acid content of roots and linolenic acid levels in cotyledons were doubled, but a 5-fold reduction in linolenic acid concentrations was observed in roots. Methyl jasmonate intensified fatty acid peroxidation in cotyledons after 4 and 7 days and in roots after 4 days of exposure. Peroxidation was inhibited in the hypocotyl and roots after 7 days. The noted changes in the composition and peroxidation of fatty acids are probably indicative of senescence in buckwheat seedlings under the influence of MJ. Senescence seems to proceed faster in cotyledons than in other organs of buckwheat seedlings.
Highlights
Methyl jasmonate (MJ) is a naturally occurring phytohormone involved in the signal transduction pathway and plant responses to environmental stressors [1]
The content of the following major fatty acids was analyzed in the organs of buckwheat seedlings: palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid
The influence of methyl jasmonate (MJ) on the fatty acid content of buckwheat seedlings was highly dependent on the type of evaluated tissue and length of exposure to MJ
Summary
Methyl jasmonate (MJ) is a naturally occurring phytohormone involved in the signal transduction pathway and plant responses to environmental stressors [1]. The impact of MJ on the levels and composition of fatty acids in plant tissues is less known and ambiguous. Exogenous MJ clearly increased the content of free and bound oleic and linoleic acids in tulip stems, but it did not affect the levels of palmitic, stearic, and linolenic acids [3]. MJ significantly increased the content of linolenic acid and induced a less pronounced decrease in the concentrations of linoleic acid [4]. MJ did not influence or provoked minor changes in the content of free and bound fatty acids in the petioles and blades of Kalanchoe blossfeldiana [5]. MJ decreased the content of free linolenic acid in intact tulip leaves [6]
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