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Lipids as Signals, Cofactors, and Pigments: -Plants Use Phosphatidylinositols, Steroids, and Eicosanoidlike Compounds in Signaling

المؤلف:  David L. Nelson، Michael M. Cox

المصدر:  Lehninger Principles of Biochemistry

الجزء والصفحة:  360

2026-05-10

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Lipids as Signals, Cofactors, and Pigments:- Plants Use Phosphatidylinositols, Steroids, and Eicosanoidlike Compounds in Signaling

Vascular plants contain phosphatidylinositol 4,5-bisphosphate, as well as the phospholipase that releases IP₃, and they use IP₃ to regulate the intracellular concentration of Ca²⁺. Brassinolide and the related group of brassinosteroids are potent growth regulators in plants, increasing the rate of stem elongation and influencing the orientation of cellulose microfibrils in the cell wall during growth. Jasmonate, derived from the fatty acid 18:3(Δ^9,12,15) in membrane lipids, is chemically similar to the eicosanoids of animal tissues and also serves as a powerful signal, triggering the plant’s defenses in response to insect-inflicted damage. The methyl ester of jasmonate gives the characteristic fragrance of jasmine oil, which is widely used in the perfume industry.