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| Description
| - The effects of short-term darkening and methyl jasmonate (MeJA) on cotyledon senescence were studied 24 h after transfer of intact 7-day-old Cucurbita pepo (zucchini) seedlings to darkness or spraying with 100 mu M MeJA. The jasmonate inhibitory effect on chlorophyll content and chloroptast transcriptional activity was stronger compared with darkness. Further, MeJA reduced the photosynthetic rate whereas darkness did not affect photosynthesis. Neither stress factor affected the photochemical quantum efficiency of photosystem II (PSII) estimated by the variable fluorescence (F-v)/maximal fluorescence (F-m) ratio, suggesting the existence of mechanisms protecting the functional. activity of PSII at earlier stages of senescence, thus making this parameter more stable compared to others used to quantify senescence. Both stress factors caused a decrease in the content of physiologically active cytokinins, especially trans-zeatin (Z), with the jasmonate effect being much more pronounced when compared to ...
- The effects of short-term darkening and methyl jasmonate (MeJA) on cotyledon senescence were studied 24 h after transfer of intact 7-day-old Cucurbita pepo (zucchini) seedlings to darkness or spraying with 100 mu M MeJA. The jasmonate inhibitory effect on chlorophyll content and chloroptast transcriptional activity was stronger compared with darkness. Further, MeJA reduced the photosynthetic rate whereas darkness did not affect photosynthesis. Neither stress factor affected the photochemical quantum efficiency of photosystem II (PSII) estimated by the variable fluorescence (F-v)/maximal fluorescence (F-m) ratio, suggesting the existence of mechanisms protecting the functional. activity of PSII at earlier stages of senescence, thus making this parameter more stable compared to others used to quantify senescence. Both stress factors caused a decrease in the content of physiologically active cytokinins, especially trans-zeatin (Z), with the jasmonate effect being much more pronounced when compared to ... (en)
- Aplikace roztoku metylesteru kyseliny jasmonové (100 µM) na sedmidenní rostliny tykve bylo více účinné při indukci senescence děloh rostlin tykve než sedmidenní zatemnění intaktních rostlin. Urychlené stárnutí děloh se projevilo snížením obsahu chlorofylu, transkripční aktivity chloroplastů a rychlosti fotosyntézy. Žádný z těchto dvou stresových faktorů nepůsobil na fotochemickou účinnost fotosystému II, ale oba stresové faktory snižovaly obsah fyziologicky aktivních cytokininů, tj. rostlinných hormonů zpomalujících stárnutí rostlinných pletiv a orgánů. Výsledky naznačují, že oba stresové faktory urychlují senescenci děloh působením na snižování hladin cytokininů při čemž jasmonát je účinnějším stresorem než tma. (cs)
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| Title
| - Methyl jasmonate is a more effective senescence-promoting factor in Culcurbita pepo (zucchini) cotyledons when compared with darkness at the early stage of senescence
- Methyl jasmonate is a more effective senescence-promoting factor in Culcurbita pepo (zucchini) cotyledons when compared with darkness at the early stage of senescence (en)
- Metylester kyseliny jasmonové je účinějším faktorem urychlujícím senescenci děloh rostlin Cucurbita pepo (tykev) než tma (cs)
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| skos:prefLabel
| - Methyl jasmonate is a more effective senescence-promoting factor in Culcurbita pepo (zucchini) cotyledons when compared with darkness at the early stage of senescence
- Methyl jasmonate is a more effective senescence-promoting factor in Culcurbita pepo (zucchini) cotyledons when compared with darkness at the early stage of senescence (en)
- Metylester kyseliny jasmonové je účinějším faktorem urychlujícím senescenci děloh rostlin Cucurbita pepo (tykev) než tma (cs)
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| skos:notation
| - RIV/61389030:_____/07:00099663!RIV08-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(IAA600380507), V, Z(AV0Z50380511)
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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:_____/07:00099663
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - cotyledons; cytokinins; dark treatment (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - PT - Portugalská republika
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Journal of Plant Physiology
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| 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
| - Malbeck, Jiří
- van Staden, J.
- Kamínek, Miroslav
- Ananiev, E. D.
- Ananieva, K.
- Mishev, K.
- Georgieva, K.
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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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| is http://linked.open...avai/riv/vysledek
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