Abstract
Loss of chlorophyll (Chl) and carotenoids (Car) of leaves and changes in Chl fluorescence emission and polarisation, malondialdehyde (MDA) accumulation, and 2,6-dichlorophenol indophenol (DCPIP) photoreduction in chloroplasts of wheat seedlings grown under different irradiance and subsequently exposed to high irradiance stress (HIS; 250 W m-2) were studied in mature and senescent primary wheat leaves. Faster rate of pigment loss was observed in leaves of moderate irradiance (MI; 15 W m-2) grown plants, compared to high irradiance (HI-1 and HI-2; 30 and 45 W m-2) ones when exposed to HIS. A relatively lower loss of Car in the plants grown in HI-1 and HI-2 exposed to HIS suggests HI adaptation of these seedlings. The slower rate of increase in the ratio of Chl fluorescence emission (F685/F735) also may suggest photoprotective strategy of HI grown seedlings. There was a positive correlation between MDA accumulation and Chl fluorescence polarisation. The DCPIP photoreduction activity in chloroplasts isolated from HI-1 and HI-2 grown plants exposed to HIS showed slower loss of electron transport activity compared to MI grown plants. These observations suggest that plants grown under higher irradiance have capacity to manage the excess quanta better than those grown under lower irradiance.
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Claims 6
Claim · model-written summary
Moderate-irradiance-grown wheat leaves lost pigments faster under high irradiance stress than high-irradiance-grown leaves.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- moderate irradiance (MI; 15 W m-2)e0
- Outcome
- pigment losse0
- Direction
- Fastere0
- Comparator
- high irradiance (HI-1 and HI-2; 30 and 45 W m-2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Faster rate of pigment loss was observed in leaves of moderate irradiance (MI; 15 W m-2) grown plants, compared to high irradiance (HI-1 and HI-2; 30 and 45 W m-2) ones when exposed to HIS”
t0“Wheat Chloroplasts”
Claim · model-written summary
High-irradiance-grown plants had lower carotenoid loss under high irradiance stress.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- HI-1 and HI-2e0
- Outcome
- loss of Care0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A relatively lower loss of Car in the plants grown in HI-1 and HI-2 exposed to HIS”
t0“Wheat Chloroplasts”
Claim · model-written summary
High-irradiance-grown seedlings showed a slower increase in the chlorophyll fluorescence ratio.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- ratio of Chl fluorescence emission (F685/F735)e0
- Direction
- slower rate of increasee0
- Qualifier
- HI grown seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The slower rate of increase in the ratio of Chl fluorescence emission (F685/F735) also may suggest photoprotective strategy of HI grown seedlings”
t0“Wheat Chloroplasts”
Claim · model-written summary
MDA accumulation correlated positively with chlorophyll fluorescence polarisation.
- Taxon
- WheatTriticum aestivumt0
- Compound
- MDAe0
- Outcome
- Chl fluorescence polarisatione0
- Direction
- positive correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a positive correlation between MDA accumulation and Chl fluorescence polarisation”
t0“Wheat Chloroplasts”
Claim · model-written summary
Chloroplasts from high-irradiance-grown plants lost electron transport activity more slowly after high irradiance stress.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- HI-1 and HI-2e0
- Outcome
- electron transport activitye0
- Direction
- slower losse0
- Comparator
- MI grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The DCPIP photoreduction activity in chloroplasts isolated from HI-1 and HI-2 grown plants exposed to HIS showed slower loss of electron transport activity compared to MI grown plants”
t0“Wheat Chloroplasts”
Claim · model-written summary
The authors infer greater excess-light management in high-irradiance-grown plants.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- capacity to manage the excess quantae0
- Direction
- bettere0
- Comparator
- those grown under lower irradiancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown under higher irradiance have capacity to manage the excess quanta better than those grown under lower irradiance”
t0“Wheat Chloroplasts”
The same questions in other papers
light · physiology: pigments · Triticum aestivum (wheat)Results differ
8 papers in the same direction as this paper · 13 in the opposite direction
- negative
- positive
- positive
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See all 22 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.