Abstract
The effects of light on the habitat choice of Primula vulgaris, P. veris and their spontaneous interspecific hybrids were studied. Photosynthetic performance (CO 2 fixation) and composition of the photosynthetic pigments were measured on plants grown under semi-shaded conditions (control) and under natural high light condition for 20 days (HLG). Assimilation rates of P. veris were better than those of P. vulgaris at all light intensities. Hybrids photosynthesised similarly well as P. veris at lower light intensities, and presented intermediate photosynthetic performance between the parent species at higher light intensities. Total chlorophylls, chloro- phyll a/b ratio, xanthophyll cycle pool, and the ratio of total carotenoids to total chlorophylls were higher in P. veris than in P. vulgaris, and these parameters, with the exception of the last one, showed considerable similarity of hybrids to P. vulgaris. Contrasting with the parent spe- cies, hybrid plants were able to increase the xantophyll cycle pool significantly after an intensive light exposure. The HLG treatment revealed that the extent of the photoinhibition was lower in P. veris than in the other two taxa. These results explain the difference between the habitat preferences of the parent species, and the ability of hybrids to occupy more open sites than P. vulgaris can.
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Claims 8
Claim · model-written summary
P. veris assimilation rates were better than those of P. vulgaris at all light intensities.
- Taxon
- P. veris
Primula verise1 - Outcome
- Assimilation ratese1
- Direction
- bettere1
- Qualifier
- at all light intensitiese1
- Comparator
- P. vulgarise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Assimilation rates of P. veris were better than those of P. vulgaris at all light intensities”
Claim · model-written summary
Hybrids photosynthesised similarly well to P. veris at lower light intensities.
- Taxon
- Primula vulgaris x P. veris hybrid
Primula vulgarist0 - Treatment
- lower light intensitiese2
- Outcome
- photosynthesisede2
- Direction
- similarly welle2
- Comparator
- P. verise2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Primula vulgaris x P. veris hybrid”
e2“Hybrids photosynthesised similarly well as P. veris at lower light intensities”
Claim · model-written summary
Hybrids showed intermediate photosynthetic performance between the parent species at higher light intensities.
- Taxon
- Primula vulgaris x P. veris hybridPrimula vulgarist0
- Treatment
- higher light intensitiese3
- Outcome
- photosynthetic performancee3
- Direction
- intermediatee3
- Comparator
- the parent speciese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Primula vulgaris x P. veris hybrid”
e3“presented intermediate photosynthetic performance between the parent species at higher light intensities”
Claim · model-written summary
Total chlorophylls, chlorophyll a/b ratio and xanthophyll cycle pool were higher in P. veris than in P. vulgaris.
- Taxon
- P. verisPrimula verise4
- Outcome
- Total chlorophylls, chloro- phyll a/b ratio, xanthophyll cycle poole4
- Direction
- highere4
- Comparator
- P. vulgarise4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Total chlorophylls, chloro- phyll a/b ratio, xanthophyll cycle pool, and the ratio of total carotenoids to total chlorophylls were higher in P. veris than in P. vulgaris”
Claim · model-written summary
The ratio of total carotenoids to total chlorophylls was higher in P. veris than in P. vulgaris.
- Taxon
- P. verisPrimula verise4
- Outcome
- the ratio of total carotenoids to total chlorophyllse4
- Direction
- highere4
- Comparator
- P. vulgarise4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Total chlorophylls, chloro- phyll a/b ratio, xanthophyll cycle pool, and the ratio of total carotenoids to total chlorophylls were higher in P. veris than in P. vulgaris”
Claim · model-written summary
The hybrid showed considerable similarity to P. vulgaris in the pigment parameters, except the carotenoid ratio.
- Taxon
- Primula vulgaris x P. veris hybridPrimula vulgarist0
- Outcome
- these parameterse5
- Direction
- considerable similaritye5
- Qualifier
- with the exception of the last onee5
- Comparator
- P. vulgarise5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Primula vulgaris x P. veris hybrid”
e5“these parameters, with the exception of the last one, showed considerable similarity of hybrids to P. vulgaris”
Claim · model-written summary
After the HLG treatment, photoinhibition was lower in P. veris than in the other two taxa.
- Taxon
- P. verisPrimula verise7
- Treatment
- HLG treatmente7
- Outcome
- extent of the photoinhibitione7
- Direction
- lowere7
- Comparator
- the other two taxae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The HLG treatment revealed that the extent of the photoinhibition was lower in P. veris than in the other two taxa”
Claim · model-written summary
The acclimation differences are interpreted to explain the habitat preference difference between the parent species, and hybrids occupying more open sites.
- Taxon
- Primula vulgaris x P. veris hybridPrimula vulgarist0
- Outcome
- habitat preferencese7
- Qualifier
- the ability of hybrids to occupy more open sitese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Primula vulgaris x P. veris hybrid”
e7“These results explain the difference between the habitat preferences of the parent species, and the ability of hybrids to occupy more open sites than P. vulgaris can”