Abstract
The effects of phytochrome status on chlorophyll content and on steady-state levels of thylakoid proteins were investigated in green leaves of Nicotiana tabacum L. plants grown under white light. Far-red light given either as a pulse at the end of each photoperiod, or as a supplement to white light during the photoperiod, reduced chlorophyll content per unit area and per unit dry weight. These differences were also observed after resolving chlorophyll-containing polypeptides by gel electrophoresis. Chlorophyll a:b ratio was unchanged. Both Coomassie blue-stained gels and immunochemical analyses showed that, in contrast to the observations in etiolated barley (K Apel, K Kloppstech [1980] Planta 150: 426-430) and pea (J Bennett [1981] Eur J Biochem 118: 61-70) seedlings, and in etiolated tobacco leaves (this report), in fully deetiolated tobacco plants changes in chlorophyll content were not correlated with obvious changes in the steady-state levels of thylakoid proteins (e.g. light-harvesting, chlorophyll a/b-binding proteins).
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Claims 5
Claim · model-written summary
Far-red pulses reduced chlorophyll per area and dry weight.
- Taxon
- Nicotiana tabacum L.
Nicotiana tabacume1 - Treatment
- a pulse at the end of each photoperiode0
- Outcome
- chlorophyll content per unit area and per unit dry weighte0
- Direction
- reducede0
- Comparator
- white lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Far-red light given either as a pulse at the end of each photoperiod, or as a supplement to white light during the photoperiod, reduced chlorophyll content per unit area and per unit dry weight”
e1“Nicotiana tabacum L.”
Claim · model-written summary
Far-red supplementation reduced chlorophyll per area and dry weight.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume1
- Treatment
- a supplement to white light during the photoperiode0
- Outcome
- chlorophyll content per unit area and per unit dry weighte0
- Direction
- reducede0
- Comparator
- white lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Far-red light given either as a pulse at the end of each photoperiod, or as a supplement to white light during the photoperiod, reduced chlorophyll content per unit area and per unit dry weight”
e1“Nicotiana tabacum L.”
Claim · model-written summary
Electrophoresis also showed the chlorophyll differences.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume1
- Outcome
- These differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These differences were also observed after resolving chlorophyll-containing polypeptides by gel electrophoresis”
e1“Nicotiana tabacum L.”
Claim · model-written summary
The chlorophyll a:b ratio did not change.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume1
- Treatment
- Far-red lighte2
- Outcome
- Chlorophyll a:b ratioe0
- Direction
- unchangede0
- Comparator
- white lighte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll a:b ratio was unchanged”
e1“Nicotiana tabacum L.”
e2“Far-red light”
e3“supplement to white light during the photoperiod”
Claim · model-written summary
Chlorophyll changes were uncorrelated with obvious changes in steady-state thylakoid proteins in fully deetiolated plants.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- fully deetiolated tobacco plantse0
- Outcome
- changes in chlorophyll contente0
- Comparator
- steady-state levels of thylakoid proteinse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in fully deetiolated tobacco plants changes in chlorophyll content were not correlated with obvious changes in the steady-state levels of thylakoid proteins”
The same questions in other papers
light · physiology: pigments · Nicotiana tabacum (tobacco)Positive and negative results
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- positive
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See all 19 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.