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Statements

Subject Item
n2:RIV%2F61389030%3A_____%2F14%3A00429986%21RIV15-AV0-61389030
rdf:type
n7:Vysledek skos:Concept
dcterms:description
This paper reports the ways that the differences in leaf senescence are related to grain filling, grain yield, and the dynamics of cytokinins (CKs) in the top three leaves of four field-grown new plant type (NPT) rice, a tropical japonica developed at the International Rice Research Institute, Philippines, to increase the yield potential of rice. The chlorophyll content in leaves decreased from flowering to maturity in all the NPT lines, whereas the grain filling percentage was higher in the fast-senescing NPT line than in slow-senescing NPT line. Grain yield was positively correlated with senescence in the flag leaf. Rapid changes in the CK levels were recorded in the leaves of the fast-senescing line, whereas the CK levels were relatively stable in leaves of the slow-senescing line, suggesting that the dynamics of CKs in the fast-senescing line are vital for fast senescence. There were no significant changes in bioactive CKs, CK O-glucosides (storage CKs), and cis-zeatin derivatives in different leaves of the slow-senescing NPT line between 0 and 3 weeks after flowering, suggesting that the content of these CKs is relatively stable during grain filling. A progressive increase in levels of bioactive CKs was positively correlated with gradual accumulation of CK N-glucosides (inactive CKs) in the top three leaves of the slow-senescing NPT line, whereas the decrease of bioactive CKs in the flag leaf of the fast-senescing line was accompanied by accumulation of CK O-glucosides. These results suggest that there is a higher rate of biosynthesis and/or import of bioactive CKs as well as their turnover which may favor delay of leaf senescence in the slow-senescing NPT line. This paper reports the ways that the differences in leaf senescence are related to grain filling, grain yield, and the dynamics of cytokinins (CKs) in the top three leaves of four field-grown new plant type (NPT) rice, a tropical japonica developed at the International Rice Research Institute, Philippines, to increase the yield potential of rice. The chlorophyll content in leaves decreased from flowering to maturity in all the NPT lines, whereas the grain filling percentage was higher in the fast-senescing NPT line than in slow-senescing NPT line. Grain yield was positively correlated with senescence in the flag leaf. Rapid changes in the CK levels were recorded in the leaves of the fast-senescing line, whereas the CK levels were relatively stable in leaves of the slow-senescing line, suggesting that the dynamics of CKs in the fast-senescing line are vital for fast senescence. There were no significant changes in bioactive CKs, CK O-glucosides (storage CKs), and cis-zeatin derivatives in different leaves of the slow-senescing NPT line between 0 and 3 weeks after flowering, suggesting that the content of these CKs is relatively stable during grain filling. A progressive increase in levels of bioactive CKs was positively correlated with gradual accumulation of CK N-glucosides (inactive CKs) in the top three leaves of the slow-senescing NPT line, whereas the decrease of bioactive CKs in the flag leaf of the fast-senescing line was accompanied by accumulation of CK O-glucosides. These results suggest that there is a higher rate of biosynthesis and/or import of bioactive CKs as well as their turnover which may favor delay of leaf senescence in the slow-senescing NPT line.
dcterms:title
Changes in the Chlorophyll Content and Cytokinin Levels in the Top Three Leaves of New Plant Type Rice During Grain Filling Changes in the Chlorophyll Content and Cytokinin Levels in the Top Three Leaves of New Plant Type Rice During Grain Filling
skos:prefLabel
Changes in the Chlorophyll Content and Cytokinin Levels in the Top Three Leaves of New Plant Type Rice During Grain Filling Changes in the Chlorophyll Content and Cytokinin Levels in the Top Three Leaves of New Plant Type Rice During Grain Filling
skos:notation
RIV/61389030:_____/14:00429986!RIV15-AV0-61389030
n4:aktivita
n11:P n11:I
n4:aktivity
I, P(1M06030)
n4:cisloPeriodika
1
n4:dodaniDat
n9:2015
n4:domaciTvurceVysledku
n15:4134427 n15:4739841 n15:4390644
n4:druhVysledku
n10:J
n4:duvernostUdaju
n5:S
n4:entitaPredkladatele
n6:predkladatel
n4:idSjednocenehoVysledku
6823
n4:idVysledku
RIV/61389030:_____/14:00429986
n4:jazykVysledku
n13:eng
n4:klicovaSlova
Chlorophyll; Cytokinins; Grain filling
n4:klicoveSlovo
n8:Grain%20filling n8:Cytokinins n8:Chlorophyll
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[F3D6491FBC6B]
n4:nazevZdroje
Journal of Plant Growth Regulation
n4:obor
n18:EB
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
13
n4:projekt
n16:1M06030
n4:rokUplatneniVysledku
n9:2014
n4:svazekPeriodika
33
n4:tvurceVysledku
Malbeck, Jiří Rangan, L. Fowler, M. Elliott, M. Khush, G. Rubia, L. Kamínek, Miroslav Dobrev, Petre
n4:wos
000331714000007
s:issn
0721-7595
s:numberOfPages
11
n17:doi
10.1007/s00344-013-9374-0