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Osmoregulation of leaf motor cells |
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| Authors: | Moran Nava |
| Institution: | The R.H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel. nava.moran@huji.ac.il |
| Abstract: | "Osmotic Motors"--the best-documented explanation for plant leaf movements--frequently reside in specialized motor leaf organs, pulvini. The movements result from dissimilar volume and turgor changes in two oppositely positioned parts of the pulvinus. This Osmotic Motor is powered by a plasma membrane proton ATPase, which drives KCl fluxes and, consequently, water, across the pulvinus into swelling cells and out of shrinking cells. Light signals and signals from the endogenous biological clock converge on the channels through which these fluxes occur. These channels and their regulatory pathways in the pulvinus are the topic of this review. |
| Keywords: | ABA abscissic acid AMP-PNP 5′-adenylyl-imidodiphosphate BAPTA 1 2-bis(o-aminophenoxy)ethane-N N N′ N′-tetraacetic acid BL blue light CRY cryptochrome DAG diacylglycerol H7 1-(5-isoquinolinesulpho-nyl)-2-methylpiperazin GLR glutamate receptor channel IP3 inositol 1 4 5-trisphosphate KD(H) channels depolarization (hyperpolarization)-dependent K channels MscS mechanosensitive channel small NPPB 5-nitro-2-(3-phenylpropylamino)benzoic acid OA okadaic acid Pf osmotic water permeability PHOT phototropin PHYA(E) phytochrome A(or E) PIs phosphatidylinositides PKA cAMP-dependent protein kinase PLA2 phospholipase A2 PLCδ phospholipase C-δ Pr and Pfr the red and the far-red absorbing forms of phytochrome PRC phase response curve PtdCh phosphatidylcholine PtdInsPs phosphatidyl-inositol phosphates R red light SAC stretch-activated channel SV slow vacuolar [channel] TEA tetraethyl ammonium TMB-8 8-(N N-diethylamino)octyl-3 4 5-trimethoxybenzoate TPK tandem-pore K [channel] TRP transient receptor potential [channel] |
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