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Statements

Subject Item
n2:RIV%2F60077344%3A_____%2F13%3A00422728%21RIV14-AV0-60077344
rdf:type
n6:Vysledek skos:Concept
dcterms:description
Plants in the field are commonly exposed to fluctuating light intensity, caused by variable cloud cover, self-shading of leaves in the canopy and/or leaf movement due to turbulence. In contrast to C-3 plant species, only little is known about the effects of dynamic light (DL) on photosynthesis and growth in C-4 plants. Two C-4 and two C-3 monocot and eudicot species were grown under steady light or DL conditions with equal sum of daily incident photon flux. We measured leaf gas exchange, plant growth and dry matter carbon isotope discrimination to infer CO2 bundle sheath leakiness in C-4 plants. The growth of all species was reduced by DL, despite only small changes in steady-state gas exchange characteristics, and this effect was more pronounced in C-4 than C-3 species due to lower assimilation at light transitions. This was partially attributed to increased bundle sheath leakiness in C-4 plants under the simulated lightfleck conditions. We hypothesize that DL leads to imbalances in the coordination of C-4 and C-3 cycles and increasing leakiness, thereby decreasing the quantum efficiency of photosynthesis. In addition to their other constraints, the inability of C-4 plants to efficiently utilize fluctuating light likely contributes to their absence in such environments as forest understoreys. Plants in the field are commonly exposed to fluctuating light intensity, caused by variable cloud cover, self-shading of leaves in the canopy and/or leaf movement due to turbulence. In contrast to C-3 plant species, only little is known about the effects of dynamic light (DL) on photosynthesis and growth in C-4 plants. Two C-4 and two C-3 monocot and eudicot species were grown under steady light or DL conditions with equal sum of daily incident photon flux. We measured leaf gas exchange, plant growth and dry matter carbon isotope discrimination to infer CO2 bundle sheath leakiness in C-4 plants. The growth of all species was reduced by DL, despite only small changes in steady-state gas exchange characteristics, and this effect was more pronounced in C-4 than C-3 species due to lower assimilation at light transitions. This was partially attributed to increased bundle sheath leakiness in C-4 plants under the simulated lightfleck conditions. We hypothesize that DL leads to imbalances in the coordination of C-4 and C-3 cycles and increasing leakiness, thereby decreasing the quantum efficiency of photosynthesis. In addition to their other constraints, the inability of C-4 plants to efficiently utilize fluctuating light likely contributes to their absence in such environments as forest understoreys.
dcterms:title
C-4 plants use fluctuating light less efficiently than do C-3 plants: a study of growth, photosynthesis and carbon isotope discrimination C-4 plants use fluctuating light less efficiently than do C-3 plants: a study of growth, photosynthesis and carbon isotope discrimination
skos:prefLabel
C-4 plants use fluctuating light less efficiently than do C-3 plants: a study of growth, photosynthesis and carbon isotope discrimination C-4 plants use fluctuating light less efficiently than do C-3 plants: a study of growth, photosynthesis and carbon isotope discrimination
skos:notation
RIV/60077344:_____/13:00422728!RIV14-AV0-60077344
n6:predkladatel
n16:ico%3A60077344
n3:aktivita
n7:S n7:P n7:I
n3:aktivity
I, P(ED1.1.00/02.0073), P(GAP501/12/1261), S
n3:cisloPeriodika
4
n3:dodaniDat
n11:2014
n3:domaciTvurceVysledku
n13:4511700
n3:druhVysledku
n19:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
67810
n3:idVysledku
RIV/60077344:_____/13:00422728
n3:jazykVysledku
n17:eng
n3:klicovaSlova
bundel-sheath leakiness; agrass genus muhlebergia; phosphenolpyruvate carboxylase; CO2 uptake; leaves; induction; sunflecks; responses; leaf
n3:klicoveSlovo
n4:agrass%20genus%20muhlebergia n4:phosphenolpyruvate%20carboxylase n4:CO2%20uptake n4:leaves n4:sunflecks n4:induction n4:responses n4:leaf n4:bundel-sheath%20leakiness
n3:kodStatuVydavatele
DK - Dánské království
n3:kontrolniKodProRIV
[4D37889BA932]
n3:nazevZdroje
Physiologia Plantarum
n3:obor
n8:BO
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n15:GAP501%2F12%2F1261 n15:ED1.1.00%2F02.0073
n3:rokUplatneniVysledku
n11:2013
n3:svazekPeriodika
149
n3:tvurceVysledku
Kubásek, Jiří Urban, Otmar Šantrůček, Jiří
n3:wos
000326943100007
s:issn
0031-9317
s:numberOfPages
12
n18:doi
10.1111/ppl.12057