LieÃ„ÂivÃƒÂ© rastliny v meniacich sa environmentÃƒÂ¡lnych podmienkach

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Vliv biotických a abiotických stresorů na vlastnosti rostlin 11.5.2005 100 AC cZ SC IC Cph 80 ENDOGENNÍ CYTOKININY 60 40 20 0 Fa Ta Cu Ku Fa Ta Cu Ku Fa Ta Cu Ku KONTROLA STRES REHYDRATACE Obr. 1: Změny v obsahu endogenních cytokininů [pg g -1 (č.hmot.)] v listech fazolu (Fa), tabáku (Ta), cukrovky (Cu) a kukuřice (Ku) při vodním stresu a následné rehydrataci. AC - biologicky aktivní cytokininy (trans-zeatin, dihydrozeatin, trans-zeatin-9-ribosid, dihydrozeatin-9-ribosid, isopentenyladenin, isopentenyladenin-9-ribosid), cZ - cis-deriváty zeatinu (cis-zeatin, cis-zeatin-9- ribosid), SC - zásobní cytokininy (trans-zeatin-O-glukosid, trans-zeatin-9-ribosid-O-glukosid, dihydrozeatin-9-ribosid-O-glukosid), IC - neaktivní cytokininy (trans-zeatin-7-glukosid, dihydrozeatin-7-glukosid, trans-zeatin-9-glukosid, dihydrozeatin-9-glukosid, isopentenyladenin-7- glukosid, isopentenyladenin-9-glukosid), Cph - fosfáty cytokininů. 243
Vliv biotických a abiotických stresorů na vlastnosti rostlin 11.5.2005 Tab. 1: Změny v obsahu endogenních fytohormonů (kyseliny abscisové [ng g -1 (č.hmot.)] a cytokininů [pg g -1 (č.hmot.)] při vodním stresu a následné rehydrataci. Průběh vodního stresu je charakterizován hodnotami relativního obsahu vody (RWC) [%]. ABA - kyselina abscisová, ΣCK - celkový obsah cytokininů, WS - vodní stres, RH - rehydratace. RWC ABA ΣCK Kontr. WS RH Kontr. WS RH Kontr. WS RH Fazol 91,55 48,17 86,37 287,3 431,0 385,3 39,42 102,88 84,78 Tabák 80,60 68,40 83,70 153,7 201,5 235,0 9,22 12,01 11,42 Cukrovka 84,19 65,57 91,57 320,3 302,7 402,7 14,16 17,40 11,65 Kukuřice 87,10 54,61 81,51 162,7 309,7 299,3 8,56 19,36 6,76 Literatura ABOU-MANDOUR, A.A., HARTUNG, W.: Tissue culture of the desert plant Anastatica hierochuntica. - Plant Cell Rep. 14: 657-661, 1995. ANANIEVA, K., MALBECK, J., KAMÍNEK, M., VAN STADEN, J.: Changes in endogenous cytokinin levels in cotyledons of Cucurbita pepo (zucchini) during natural and dark-induced senescence. - Physiol. Plant. 122: 133-142, 2004. ATANASSOVA, L.Y., STOYANOV, I.G., PISSARSKA, M.G.: Salt-induced responses of endogenous cytokinins in pea plants. - Biol. Plant. 42 (Suppl.): S73, 1999. BANO, A., DÖRFLING, K., BETTIN, D., HAHN, H.: Abscisic acid and cytokinins as possible rootto-shoot signals in xylem sap of rice plants in drying soil. - Aust. J. Plant Physiol. 20: 109-115, 1993. ČATSKÝ, J.: Determination of water deficit in discs cut out from leaf blades. - Biol. Plant. 2: 76-78, 1960. FUSSEDER, A., WARTINGER, A., HARTUNG, W., SCHULZE, E.-D., HEILMEIER, H.: Cytokinins in the xylem sap of desert grown almond (Prunus dulcis) trees: Daily courses and their possible interactions with abscisic acid and leaf conductance. - New Phytol. 122: 45-52, 1992. GOICOECHEA, N., ANTOLÍN, M.C., SÁNCHEZ-DÍAZ, M.: Gas ex-change is related to the hormonal balance in mycorrhizal or nitrogen-fixing alfalfa subjected to drought. - Physiol. Plant. 100: 989-997, 1997. HARTUNG, W., WEILER, E.W., RADIN, J.W.: Auxin and cytokinins in the apoplastic solution of dehydrated cotton leaves. - J. Plant Physiol. 140: 324-327, 1992. 244
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LieÃ„ÂivÃƒÂ© rastliny v meniacich sa environmentÃƒÂ¡lnych podmienkach

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LieÃ„ÂivÃƒÂ© rastliny v meniacich sa environmentÃƒÂ¡lnych podmienkach