Abstract
In this study, we have compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes during their entire growth period, under field conditions. Analyses were based on measurements of both slow and fast chlorophyll (Chl) a fluorescence kinetics, gas exchange, pigment composition; and of light incident on leaves during their growth. Both the shade and the sun barley leaves had similar Chl a/b and Chl/carotenoid ratios. The fluorescence induction analyses uncovered major functional differences between the sun and the shade leaves: lower connectivity among Photosystem II (PSII), decreased number of electron carriers, and limitations in electron transport between PSII and PSI in the shade leaves; but only low differences in the size of PSII antenna. We discuss the possible protective role of low connectivity between PSII units in shade leaves in keeping the excitation pressure at a lower, physiologically more acceptable level under high light conditions.
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Claims 6
Claim · model-written summary
Shade light lowered connectivity among PSII units in barley leaves compared with sun-grown leaves
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Organ / stage
- shade leavese1
- Treatment
- shade light regimese0
- Outcome
- connectivity among Photosystem II (PSII)e1
- Direction
- lowere1
- Comparator
- sune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes”
e1“lower connectivity among Photosystem II (PSII), decreased number of electron carriers, and limitations in electron transport between PSII and PSI in the shade leaves”
Claim · model-written summary
Shade light decreased the number of electron carriers in barley leaves
- Taxon
- barleyHordeum vulgaree0
- Treatment
- shade light regimese0
- Outcome
- number of electron carrierse1
- Direction
- decreasede1
- Comparator
- sune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes”
e1“lower connectivity among Photosystem II (PSII), decreased number of electron carriers, and limitations in electron transport between PSII and PSI in the shade leaves”
Claim · model-written summary
Shade light limited electron transport between PSII and PSI in barley leaves
- Taxon
- barleyHordeum vulgaree0
- Treatment
- shade light regimese0
- Outcome
- electron transport between PSII and PSIe1
- Direction
- decreaseinferrede1
- Comparator
- sune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes”
e1“lower connectivity among Photosystem II (PSII), decreased number of electron carriers, and limitations in electron transport between PSII and PSI in the shade leaves”
Claim · model-written summary
Shade and sun barley leaves showed only low differences in PSII antenna size
- Taxon
- barleyHordeum vulgaree0
- Treatment
- shade light regimese0
- Outcome
- size of PSII antennae2
- Direction
- no_changeinferrede2
- Comparator
- sune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes”
e2“but only low differences in the size of PSII antenna”
Claim · model-written summary
Shade and sun barley leaves had similar Chl a/b and Chl/carotenoid ratios
- Taxon
- barleyHordeum vulgaree0
- Treatment
- shade light regimese0
- Outcome
- Chl a/b and Chl/carotenoid ratiose3
- Direction
- similare3
- Comparator
- sune3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes”
e3“Both the shade and the sun barley leaves had similar Chl a/b and Chl/carotenoid ratios”
Claim · model-written summary
Low PSII connectivity in shade leaves may protect against excess excitation pressure under high light
- Taxon
- barleyHordeum vulgaree0
- Organ / stage
- shade leavese4
- Outcome
- excitation pressuree4
- Qualifier
- low connectivity between PSII unitse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared photosynthetic performance of barley leaves (Hordeum vulgare L.) grown under sun and shade light regimes”
e4“We discuss the possible protective role of low connectivity between PSII units in shade leaves in keeping the excitation pressure at a lower, physiologically more acceptable level under high light conditions”
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See all 18 papers →shade · physiology: pigments · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.