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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F05%3A00001820%21RIV06-MSM-15310___
rdf:type
skos:Concept n18:Vysledek
dcterms:description
Senescence is the sequence of biochemical and physiological events comprising the final phase in development, which culminates in the cellular breakdown and death. Senescence initiation is programmed new gene expression caused naturally or induced by space competition, light, environmental stress and nutrition factors. It was proven that endogenously enhanced cytokinin contents in leaves leads to the delayed senescence. In cereals, the velocity of senescence of the flag leaf determines subsequent power and quantity of assimilate transport to the ripening seeds. Hence, a triggered manipulation of cytokinin content via engineered regulation of CKX gene expression becomes a promising tool to alter yield attributes in cereals. High levels of cytokinins were found in chloroplasts extracted from green leaves. There is no evidence for any CKX isoforms to target to chloroplast up to present time. However, an enormous increase in the CKX level was detected in early stages of leaf senescence in many cereal spec Senescence je série biochemických a fyziologických událostí v závěrečné fázi vývoje rostlin. Bylo prokázáno, že zvýšený endogenní obsah cytokininů v listech vede k oddálení senescence. Cílená manipulace hladiny cytokininů např. pomocí regulace exprese genů cytokinindehydrogenasy (CKX) u obilovin může sloužit ke zvýšení výnosů. Vysoké koncentrace cytokininů byly nalezeny v chloroplastech ze zelených listů, ale doposud nebyla prokázána přítomnost cytokinindehydrogenasy v této organele. Byly sledovány změny v expresi všech známých genů CKX u pšenice a ječmene a diskutovány ve vztahu k subcelulární lokalizaci cytokininů. Senescence is the sequence of biochemical and physiological events comprising the final phase in development, which culminates in the cellular breakdown and death. Senescence initiation is programmed new gene expression caused naturally or induced by space competition, light, environmental stress and nutrition factors. It was proven that endogenously enhanced cytokinin contents in leaves leads to the delayed senescence. In cereals, the velocity of senescence of the flag leaf determines subsequent power and quantity of assimilate transport to the ripening seeds. Hence, a triggered manipulation of cytokinin content via engineered regulation of CKX gene expression becomes a promising tool to alter yield attributes in cereals. High levels of cytokinins were found in chloroplasts extracted from green leaves. There is no evidence for any CKX isoforms to target to chloroplast up to present time. However, an enormous increase in the CKX level was detected in early stages of leaf senescence in many cereal spec
dcterms:title
Changes of cytokinin oxidase/dehydrogenase levels during senescence in cereals Změny v hladině cytokininoxidasy/dehydrogenasy u obilovin během senescence Changes of cytokinin oxidase/dehydrogenase levels during senescence in cereals
skos:prefLabel
Changes of cytokinin oxidase/dehydrogenase levels during senescence in cereals Změny v hladině cytokininoxidasy/dehydrogenasy u obilovin během senescence Changes of cytokinin oxidase/dehydrogenase levels during senescence in cereals
skos:notation
RIV/61989592:15310/05:00001820!RIV06-MSM-15310___
n4:strany
S5
n4:aktivita
n14:P n14:Z
n4:aktivity
P(GA522/03/0979), P(GP204/03/P103), Z(MSM6198959216)
n4:cisloPeriodika
S1
n4:dodaniDat
n5:2006
n4:domaciTvurceVysledku
n15:7890052 n15:4536274
n4:druhVysledku
n12:J
n4:duvernostUdaju
n8:S
n4:entitaPredkladatele
n16:predkladatel
n4:idSjednocenehoVysledku
514929
n4:idVysledku
RIV/61989592:15310/05:00001820
n4:jazykVysledku
n17:eng
n4:klicovaSlova
cereals; chloroplast; cytokinin oxidase/dehydrogenase; gene expression; senescence
n4:klicoveSlovo
n6:gene%20expression n6:cytokinin%20oxidase%2Fdehydrogenase n6:cereals n6:senescence n6:chloroplast
n4:kodStatuVydavatele
CZ - Česká republika
n4:kontrolniKodProRIV
[F2308B427D88]
n4:nazevZdroje
Biologia Plantarum
n4:obor
n11:CE
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
5
n4:projekt
n7:GP204%2F03%2FP103 n7:GA522%2F03%2F0979
n4:rokUplatneniVysledku
n5:2005
n4:svazekPeriodika
49
n4:tvurceVysledku
Vyroubalová, Šárka Jablonská, Hana Galuszka, Petr Šromová, Lucie Frébort, Ivo
n4:zamer
n19:MSM6198959216
s:issn
0006-3134
s:numberOfPages
1
n13:organizacniJednotka
15310