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FEDERICO J. BERLI DANIELA MORENO PATRICIA PICCOLI LEANDRO HESPANHOL-VIANA M. FERNANDA SILVA RICARDO BRESSAN-SMITH J. BRUNO CAVAGNARO & RUBÉN BOTTINI 《Plant, cell & environment》2010,33(1):1-10
We investigated the interactions of abscisic acid (ABA) in the responses of grape leaf tissues to contrasting ultraviolet (UV)-B treatments. One-year-old field-grown plants of Vitis vinifera L. were exposed to photosynthetically active radiation (PAR) where solar UV-B was eliminated by using polyester filters, or where PAR was supplemented with UV-B irradiation. Treatments combinations included weekly foliar sprays of ABA or a water control. The levels of UV-B absorbing flavonols, quercetin and kaempferol were significantly decreased by filtering out UV-B, while applied ABA increased their content. Concentration of two hydroxycinnamic acids, caffeic and ferulic acids, were also increased by ABA, but not affected by plus UV-B (+UV-B) treatments. Levels of carotenoids and activities of the antioxidant enzymes, catalase, ascorbate peroxidase and peroxidase were elevated by +ABA treatments, but only if +UV-B was given. Cell membrane β -sitosterol was enhanced by ABA independently of +UV-B. Changes in photoprotective compounds, antioxidant enzymatic activities and sterols were correlated with lessened membrane harm by UV-B, as assessed by ion leakage. Oxidative damage expressed as malondialdehyde content was increased under +UV-B treatments. Our results suggest that the defence system of grape leaf tissues against UV-B is activated by UV-B irradiation with ABA acting downstream in the signalling pathway. 相似文献
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ADRIANO PODESTA ROBERTO MARANGONI CHIARA VILLANI GIULIANO COLOMBETTI 《The Journal of eukaryotic microbiology》1994,41(6):565-569
Immunofluorescence was used to reveal the presence of a rhodopsin-like molecule on the plasma membrane of the photoresponsive ciliate Fabrea salina. The ciliate, fixed on a glass support, showed a spontaneous red-orange fluorescence. Cells incubated with a fluoresceinated, anti-bovine opsin, sheep polyclonal antiserum showed instead a green fluorescence typical of fluorochrome excited at 436 nm, whereas cells incubated with a fluoresceinated, nonimmune sheep serum kept their original red fluorescence. Excess bovine opsin did not inhibit the antibody reaction, but detergent-coated purified bovine opsin was proven able to bind to the cell membrane. Since rhodopsin belongs to a gene-related protein family, which includes adrenergic or cholinergic receptors, the cell response to acute exposure to muscarinic and adrenergic agonist and antagonist drugs was investigated. Acetylcholine, atropine, hexamethonium, noradrenaline, or phenoxybenzamine in the culture medium (10-4 M) did not influence motion behaviour nor phototaxis of Fabrea salina. These findings raise the possibility that a rhodopsin-like molecule is present on the surface of Fabrea salina. Nevertheless, they do not prove that this surface antigen is a rhodopsin, or that this molecule is responsible for photoresponsiveness in this organism. 相似文献
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PATRICK K. DEVERS DEAN F. STAUFFER GARY W. NORMAN DAVE E. STEFFEN DARROCH M. WHITAKER JEFFREY D. SOLE TOM J. ALLEN STEVE L. BITTNER DAVID A. BUEHLER JOHN W. EDWARDS DANIEL E. FIGERT SCOTT T. FRIEDHOFF WILLIAM W. GIULIANO CRAIG A. HARPER WILLIAM K. IGO ROY L. KIRKPATRICK MICHAEL H. SEAMSTER HARRY A. SPIKER Jr. DAVID A. SWANSON BRIAN C. TEFFT 《野生动植物专论》2007,168(1):1-36
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A fossil Halobates from the Mediterranean and the origin of sea skaters (Hemiptera, Gerridae) 总被引:1,自引:0,他引:1
N. MLLER ANDERSEN ANTONIO FARMA ALESSANDRO MINELLI GIULIANO PICCOLI 《Zoological Journal of the Linnean Society》1994,112(4):479-489
Five species of sea skaters, genus Halobates Eschscholtz, are the only insects to have successfully colonized the open ocean. In addition, 38 species are found in sheltered coastal waters throughout tropical Indo-Pacific. The taxonomy of the genus is relatively well known, and the phylogeneuc relationships between extant species have recently been analysed (using cladistic methods). In the present paper, we describe the first fossil species of sea skaters, Halobates ruffoi sp. no v. from the Eocene deposit 'Pesciara di Bolca', in the province of Verona, northeastern Italy (geological age about 45 Myr). The significance of this fossil in setting the time scale for the reconstructed phylogeny and anagenesis of adaptive features of sea skaters, and in understanding the evolution and historical zoogeography of these marine insects is discussed. 相似文献