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Statements

Subject Item
n2:RIV%2F67179843%3A_____%2F14%3A00435188%21RIV15-AV0-67179843
rdf:type
n6:Vysledek skos:Concept
dcterms:description
Photosynthetic kinetics in changing light intensity is considered pivotal for the survival of understorey tracheophytes; however, it is virtually unknown for bryophytes because bryophytes and tracheophytes have contrasting physio- ecological strategies. Anatomy suggests that relative rate of photosynthetic induction is faster in bryophyte gametophytes due to the absence of stomata, whose slow response may limit photosynthesis of tracheophyte leaves in changing light intensity. We measured steady-state and dynamic CO2 exchange in 10 bryophyte species. We performed an in-depth survey of the moss Hypnum cupressiforme sampled from sun and shade sites. Our key results are: (1) Bryophyte photosynthesis after dark acclimatisation induced much faster than in tracheophytes, reaching 50% of maximum gross photosynthesis (A(gross)) in about 90 s. Such rapid induction is comparable only to tracheophytes whose stomata do not limit CO2 uptake. Times to reach 90% of A(gross) were also substantially shorter in bryophytes (ca 220 s) than those reported for most tracheophytes (500-2000 s). (2) Shade-grown mosses did not reveal lower photosynthetic capacity than sun ones. (3) Shade-grown H. cupressiforme induced photosynthesis slightly faster than that from forest gaps. We conclude that bryophytes are efficient utilizers of temporal light heterogeneity, increasing carbon gain during short high-light events such as sunflecks in forest undergroundy. Photosynthetic kinetics in changing light intensity is considered pivotal for the survival of understorey tracheophytes; however, it is virtually unknown for bryophytes because bryophytes and tracheophytes have contrasting physio- ecological strategies. Anatomy suggests that relative rate of photosynthetic induction is faster in bryophyte gametophytes due to the absence of stomata, whose slow response may limit photosynthesis of tracheophyte leaves in changing light intensity. We measured steady-state and dynamic CO2 exchange in 10 bryophyte species. We performed an in-depth survey of the moss Hypnum cupressiforme sampled from sun and shade sites. Our key results are: (1) Bryophyte photosynthesis after dark acclimatisation induced much faster than in tracheophytes, reaching 50% of maximum gross photosynthesis (A(gross)) in about 90 s. Such rapid induction is comparable only to tracheophytes whose stomata do not limit CO2 uptake. Times to reach 90% of A(gross) were also substantially shorter in bryophytes (ca 220 s) than those reported for most tracheophytes (500-2000 s). (2) Shade-grown mosses did not reveal lower photosynthetic capacity than sun ones. (3) Shade-grown H. cupressiforme induced photosynthesis slightly faster than that from forest gaps. We conclude that bryophytes are efficient utilizers of temporal light heterogeneity, increasing carbon gain during short high-light events such as sunflecks in forest undergroundy.
dcterms:title
Bryophyte photosynthesis in sunflecks: greater relative induction rate than in tracheophytes Bryophyte photosynthesis in sunflecks: greater relative induction rate than in tracheophytes
skos:prefLabel
Bryophyte photosynthesis in sunflecks: greater relative induction rate than in tracheophytes Bryophyte photosynthesis in sunflecks: greater relative induction rate than in tracheophytes
skos:notation
RIV/67179843:_____/14:00435188!RIV15-AV0-67179843
n3:aktivita
n13:Z n13:I
n3:aktivity
I, Z(MSM6007665801)
n3:cisloPeriodika
2
n3:dodaniDat
n8:2015
n3:domaciTvurceVysledku
n9:5868734
n3:druhVysledku
n7:J
n3:duvernostUdaju
n10:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
5885
n3:idVysledku
RIV/67179843:_____/14:00435188
n3:jazykVysledku
n16:eng
n3:klicovaSlova
bryophytes; ecophysiology; hypnum cupressiforme; light acclimatisation; photosynthetic induction; sunflecks; understorey
n3:klicoveSlovo
n5:understorey n5:hypnum%20cupressiforme n5:photosynthetic%20induction n5:bryophytes n5:light%20acclimatisation n5:sunflecks n5:ecophysiology
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[8D436BC7C7A4]
n3:nazevZdroje
Journal of Bryology
n3:obor
n15:EH
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n8:2014
n3:svazekPeriodika
36
n3:tvurceVysledku
Glime, J. M. Kubásek, Jiří Hájek, Tomáš
n3:wos
000337099400003
n3:zamer
n11:MSM6007665801
s:issn
0373-6687
s:numberOfPages
8
n17:doi
10.1179/1743282014Y.0000000096