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| Description
| - Efekt exogenní aplikace cytokininu meta-topolinu [mT; N6-(meta-hydroxybenzyl)adenin] v procesu umělé senescence na oddělených listech pšenice (Triticum aestivum L. cv. Hereward) byl studován a srovnáván v listech kde probíhala senescence při kontinuálním světle (100 µmol fotonů m 2 s 1) a ve tmě. Senescencí indukovaná degradace struktury a funkce fotosyntetického aparátu byla charakterizována redukcí obsahu chlorofylu, maximální účinností fotochemie fotosystému (PS) II (Fv/Fm) rychlostí asimilace CO2, hladinou peroxidace lipidů a modifikacemi ve struktuře chloroplastů.Zatímco v oddělených listech uchovávaných ve tmě mT efektivně zpomaloval změny vyvolané senescencí, v segmentech uchovávaných na světle se jeho účinek po několika dnech měnil v opačný. Zde jsme pozorovali přílišnou excitaci PSII, kumulaci škrobových zrn v chloroplastech a stimulaci peroxidace lipidů. Je diskutován pravděpodobný mechanismus akcelerace senescenci-doprovázejícího snížení fotosyntetické funkce a zvýšení peroxidace lipidů ... (cs)
- 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 µmol 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...
- 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 µmol 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)
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| Title
| - Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light
- Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light (en)
- Protektivní účinek cytokininu se v průběhu senescence oddělených listů pšenice v kontinuálním světle mění ve škodlivý (cs)
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| skos:prefLabel
| - Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light
- Protective cytokinin action switches to damaging during senescence of detached wheat leaves in continuous light (en)
- Protektivní účinek cytokininu se v průběhu senescence oddělených listů pšenice v kontinuálním světle mění ve škodlivý (cs)
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| skos:notation
| - RIV/61389030:_____/06:00030709!RIV07-AV0-61389030
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(IBS4055304), Z(AV0Z50380511), Z(MSM6198959215)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/61389030:_____/06:00030709
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - senescence; cytokinin; Triticum aestivum (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Doležal, Karel
- Novotný, R.
- Vlčková, A.
- Nauš, J.
- Špundová, M.
- Kotabová, E.
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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