Phospholipid-Activated Protein Kinase in Plants: Coupled to Phospholipase A2?
The search for second messenger systems in signal transduction mechanisms in cells of higher plants has always strongly been influenced by the concepts which had been developped for animal cells. To date, however, the only molecular signal transduction pathway providing a valid working hypothesis for signal transduction in plant cells is the phosphatidylinositol (PI) cycle which, in animals, produces two second messengers, myo-inosito1,1,4,5-trisphosphate (IP3) and diaclyglycerol (DAG) (Berridge 1987; Morse et al. 1989). The function of one of it, IP3, is likely to be the release of Ca2+ from the vacuole and the ER (Schuhmaker and Sze 1987) which would be similar to its function in animal cells. The function of DAG remains unclear because evidence for a DAG-activated protein kinase in plants is still scarce and controversial (Morré et al. 1984; Elliott et al. 1988; Martiny-Baron and Scherer 1989). Our own work originated from our interest in the mechanism of proton transport stimulation in zucchini microsolnes by the platelet-activating factor (PAF) (Scherer 1985) and by auxin (Scherer and Morré 1978; Scherer 1981). The at first bizarre observation of transport stimulation of plant H+-ATPase by an animal lipid
KeywordsActive Auxin Soybean Cell Naphthylacetic Acid Signal Transduction Chain Culture Soybean Cell
Unable to display preview. Download preview PDF.
- Anderson JM (1989) In: Boss WF, Morré DJ (eds) Second Messengers in Plant Growth and Development. Alan Liss, New York, pp. 167–179Google Scholar
- Burch RM, Luini A, Axelrod J (1986) Proc. Natl. Acad. Si. USA 83, 7201–7205Google Scholar
- Martiny-Baron G, Scherer GFE (1989) J. Biol. Chem., in pressGoogle Scholar
- Martiny-Baron G, Manolson BF, Scherer GFE, Poole RJ (1989) submittedGoogle Scholar
- Palmgren MG, Sommarin M (1989) Plant Physiol., in pressGoogle Scholar
- Scherer GFE (1989) In: Boss WF, Morré DJ (eds) Second Messengers in Plant Growth and Development, Alan Liss, New York, pp. 167–179Google Scholar
- Scherer GFE, Martiny-Baron G (1987) In: Klämbt D (ed.) Plant Hormone Receptors, NATO-ASI series H, vol 10, Springer, Berlin, HeidelbergGoogle Scholar
- Schuhmaker KS, Sze H (1987) J. Biol. Chem. 262, 3944–3946Google Scholar
- vom Dorp B, Volkmann D, Scherer GFE (1986) Planta 168, 151–160Google Scholar