Abstract
Photosynthetic pigments and photosynthetic activity of three Solanacea species – Solanum lycopersicum L., Solanum melongena L. and Capsicum annuum L. in response to continuous lighting (CL) during pre-reproductive period were studied. It is shown that CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant. These changes were aimed to reduce light absorption efficiency per unit leaf area. CL-induced leaf injuries were seen as interveinal chlorosis in tomato and necrotic spots in eggplant. Sweet pepper plants did not show a reduction in chlorophyll content. On the contrary, some increase in chlorophyll content was observed, although pepper leaves had some deformations (wrinkles). A higher concentration of carotenoids possessing photoprotective properties in pepper leaves probably protects the photosynthetic apparatus of this species from adverse excessive lighting. Possible reasons of CL-induced leaf injuries are discussed, among them are the continuous energy supply for photosynthesis, continuous photooxidative stress, continuous signalling to the photoreceptors and a mismatch between the internal circadian clock frequency and the external light/dark cycle known as circadian asynchrony. We suppose that another possible cause of leaf depigmentation under unfavorable light conditions may be of genetic nature. Some species (ecotypes, genotypes) may have a photosensitive mutant gene, which is normally suppressed and does not manifest itself, wherefore mutant plants phenotypically do not differ from normal (wild type) plants. In such plants, excessive lighting may cause inactivation of the suppressor protein controlledby suppressor gene and, consequently, de-repression of the mutant gene, resulting in leaf depigmentation. In this case, CL-induced chlorosis and possibly necrosis in CL-sensitive plant species (ecotypes, genotypes) can be considered as a manifestation of suppressed light-dependent chlorophyll deficiency.
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Claims 14
Claim · model-written summary
Continuous light decreased tomato chlorophyll content and light-harvesting complex II while increasing chlorophyll a/b ratio.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- CLe0
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Continuous light increased the tomato chlorophyll a/b ratio.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CLe0
- Outcome
- chlorophyll a/b ratiose0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Continuous light reduced light-harvesting complex II in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CLe0
- Outcome
- light-harvesting complex IIe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Continuous light decreased eggplant chlorophyll content.
- Taxon
- eggplant
Solanum melongenae0 - Treatment
- CLe0
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Continuous light increased eggplant chlorophyll a/b ratio.
- Taxon
- eggplantSolanum melongenae0
- Treatment
- CLe0
- Outcome
- chlorophyll a/b ratiose0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Continuous light reduced light-harvesting complex II in eggplant.
- Taxon
- eggplantSolanum melongenae0
- Treatment
- CLe0
- Outcome
- light-harvesting complex IIe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Continuous light induced interveinal chlorosis in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CLe0
- Outcome
- interveinal chlorosise0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL-induced leaf injuries were seen as interveinal chlorosis in tomato and necrotic spots in eggplant”
Claim · model-written summary
Continuous light induced necrotic spots in eggplant.
- Taxon
- eggplantSolanum melongenae0
- Treatment
- CLe0
- Outcome
- necrotic spotse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CL-induced leaf injuries were seen as interveinal chlorosis in tomato and necrotic spots in eggplant”
Claim · model-written summary
Sweet pepper chlorophyll content did not fall under continuous light.
- Taxon
- Sweet pepper
Capsicum annuume0 - Treatment
- CLe1
- Outcome
- chlorophyll contente0
- Direction
- did not show a reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweet pepper plants did not show a reduction in chlorophyll content”
t0“CONTINUOUS LIGHT”
e1“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Pepper chlorophyll content increased somewhat.
Not reportedComparator
Verbatim
e0“some increase in chlorophyll content was observed, although pepper leaves had some deformations (wrinkles)”
t0“CONTINUOUS LIGHT”
e1“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Pepper leaves developed wrinkles.
Not reportedComparatorDirection
Verbatim
e0“pepper leaves had some deformations (wrinkles)”
t0“CONTINUOUS LIGHT”
e1“CL resulted in decreased chlorophyll content, increased chlorophyll a/b ratios, reduced light-harvesting complex II in tomato and eggplant”
Claim · model-written summary
Pepper leaves had a higher carotenoid concentration.
Verbatim
e0“A higher concentration of carotenoids possessing photoprotective properties in pepper leaves probably protects the photosynthetic apparatus of this species from adverse excessive lighting”
Claim · model-written summary
Authors proposed that higher carotenoids may protect pepper photosynthesis under excess light.
Verbatim
e0“A higher concentration of carotenoids possessing photoprotective properties in pepper leaves probably protects the photosynthetic apparatus of this species from adverse excessive lighting”
Claim · model-written summary
Authors hypothesized that suppressor inactivation under excess light could derepress a mutant gene and cause leaf depigmentation.
Verbatim
e0“excessive lighting may cause inactivation of the suppressor protein controlledby suppressor gene and, consequently, de-repression of the mutant gene, resulting in leaf depigmentation”
t0“SOLONACEA SPECIES”
The same questions in other papers
light · physiology: pigments · Solanum lycopersicum (tomato)Results differ
16 papers in the same direction as this paper · 45 in the opposite direction
- negative
- positive
- positive
58 papers more in this group
See all 62 papers →light · physiology: pigments · Solanum melongena (eggplant)Positive and negative results
1 in the opposite direction
- positive
light · physiology: pigments · Capsicum annuum (sweet pepper)Positive and negative results
3 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 papers →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.