"11"^^ . "Protektivn\u00ED \u00FA\u010Dinek cytokininu se v pr\u016Fb\u011Bhu senescence odd\u011Blen\u00FDch list\u016F p\u0161enice v kontinu\u00E1ln\u00EDm sv\u011Btle m\u011Bn\u00ED ve \u0161kodliv\u00FD"@cs . "Kotabov\u00E1, E." . "1"^^ . . "senescence; cytokinin; Triticum aestivum"@en . . "RIV/61389030:_____/06:00030709" . "The effect of exogenous application of the cytokinin meta-topolin [mT; N6-(meta-hydroxybenzyl)adenine] on artificial senescence of detached wheat leaves (Triticum aestivum L. cv. Hereward) was studied and compared in leaves senescing under continuous light (100 \u00B5mol photons m 2 s 1) and darkness. Senescence-induced deterioration in structure and function of the photosynthetic apparatus was characterized by reduction in chlorophyll content, maximal efficiency of photosystem (PS) II photochemistry (Fv/Fm) and the rate of CO2 assimilation, by increase in the excitation pressure on PSII (1 - P) and a level of lipid peroxidation and by modifications in chloroplast ultrastructure. While in darkened leaf segments mT effectively slowed senescence-induced changes in all measured parameters, in light-senescing segments the effect of mT changed into opposite a few days after detachment. We observed an overexcitation of photosynthetic apparatus, as indicated by pronounced increases in the excitation pressure o..." . "Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light" . . "Efekt exogenn\u00ED aplikace cytokininu meta-topolinu [mT; N6-(meta-hydroxybenzyl)adenin] v procesu um\u011Bl\u00E9 senescence na odd\u011Blen\u00FDch listech p\u0161enice (Triticum aestivum L. cv. Hereward) byl studov\u00E1n a srovn\u00E1v\u00E1n v listech kde prob\u00EDhala senescence p\u0159i kontinu\u00E1ln\u00EDm sv\u011Btle (100 \u00B5mol foton\u016F m 2 s 1) a ve tm\u011B. Senescenc\u00ED indukovan\u00E1 degradace struktury a funkce fotosyntetick\u00E9ho apar\u00E1tu byla charakterizov\u00E1na redukc\u00ED obsahu chlorofylu, maxim\u00E1ln\u00ED \u00FA\u010Dinnost\u00ED fotochemie fotosyst\u00E9mu (PS) II (Fv/Fm) rychlost\u00ED asimilace CO2, hladinou peroxidace lipid\u016F a modifikacemi ve struktu\u0159e chloroplast\u016F.Zat\u00EDmco v odd\u011Blen\u00FDch listech uchov\u00E1van\u00FDch ve tm\u011B mT efektivn\u011B zpomaloval zm\u011Bny vyvolan\u00E9 senescenc\u00ED, v segmentech uchov\u00E1van\u00FDch na sv\u011Btle se jeho \u00FA\u010Dinek po n\u011Bkolika dnech m\u011Bnil v opa\u010Dn\u00FD. Zde jsme pozorovali p\u0159\u00EDli\u0161nou excitaci PSII, kumulaci \u0161krobov\u00FDch zrn v chloroplastech a stimulaci peroxidace lipid\u016F. Je diskutov\u00E1n pravd\u011Bpodobn\u00FD mechanismus akcelerace senescenci-doprov\u00E1zej\u00EDc\u00EDho sn\u00ED\u017Een\u00ED fotosyntetick\u00E9 funkce a zv\u00FD\u0161en\u00ED peroxidace lipid\u016F ..."@cs . . "0031-9317" . "Nau\u0161, J." . "Physiologia Plantarum" . "The effect of exogenous application of the cytokinin meta-topolin [mT; N6-(meta-hydroxybenzyl)adenine] on artificial senescence of detached wheat leaves (Triticum aestivum L. cv. Hereward) was studied and compared in leaves senescing under continuous light (100 \u00B5mol photons m 2 s 1) and darkness. Senescence-induced deterioration in structure and function of the photosynthetic apparatus was characterized by reduction in chlorophyll content, maximal efficiency of photosystem (PS) II photochemistry (Fv/Fm) and the rate of CO2 assimilation, by increase in the excitation pressure on PSII (1 - P) and a level of lipid peroxidation and by modifications in chloroplast ultrastructure. While in darkened leaf segments mT effectively slowed senescence-induced changes in all measured parameters, in light-senescing segments the effect of mT changed into opposite a few days after detachment. We observed an overexcitation of photosynthetic apparatus, as indicated by pronounced increases in the excitation pressure o..."@en . . . "Dole\u017Eal, Karel" . "P(IBS4055304), Z(AV0Z50380511), Z(MSM6198959215)" . . . "\u0160pundov\u00E1, M." . . "495676" . "Vl\u010Dkov\u00E1, A." . "DK - D\u00E1nsk\u00E9 kr\u00E1lovstv\u00ED" . "Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light"@en . . . . "Protektivn\u00ED \u00FA\u010Dinek cytokininu se v pr\u016Fb\u011Bhu senescence odd\u011Blen\u00FDch list\u016F p\u0161enice v kontinu\u00E1ln\u00EDm sv\u011Btle m\u011Bn\u00ED ve \u0161kodliv\u00FD"@cs . "RIV/61389030:_____/06:00030709!RIV07-AV0-61389030" . . "126" . "Novotn\u00FD, R." . "Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light"@en . "2" . "[DC45D898F5B7]" . "257;267" . . "6"^^ . "Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light" . . . . .