Abstract
Dark-grown plants of Sphaerocarpos, incubated in a liquid medium containing sucrose and mineral salts, have a much lower chlorophyll and nitrogen content than do light-grown plants. Two minutes of red light per 12 hours is about two-thirds as effective in increasing chlorophyll and nitrogen content as is continuous white light. These red light-induced increases are mediated by phytochrome, as they are reversible by alternating exposures to red and far-red light. They appear to be related to differences in the ultrastructure of the chloroplasts. Plastids from dark-grown plants are full of starch and develop few lamellae, while light-grown plastids contain little starch and have many lamellae. The ultrastructural studies are supported by starch determinations which revealed a phytochrome-mediated decrease in starch content. The effect of white light in increasing the chlorophyll and nitrogen content above the level attained in red light-treated plants is not mediated by photosynthetic activity. These results are related to similar responses in other archegoniates and angiosperm seedlings.
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Claims 7
Claim · model-written summary
Dark-grown Sphaerocarpos had much lower chlorophyll and nitrogen than light-grown plants.
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“Dark-grown plants of Sphaerocarpos, incubated in a liquid medium containing sucrose and mineral salts, have a much lower chlorophyll and nitrogen content than do light-grown plants”
Claim · model-written summary
Two minutes of red light per 12 hours increased chlorophyll and nitrogen about two-thirds as effectively as continuous white light.
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“Two minutes of red light per 12 hours is about two-thirds as effective in increasing chlorophyll and nitrogen content as is continuous white light”
Claim · model-written summary
Alternating red and far-red exposures reversed the red-light-induced increases.
- Taxon
- Sphaerocarpos donnellii Aust.Sphaerocarpos donnelliit0
- Treatment
- alternating exposures to red and far-red lighte0
- Gene
- phytochromee0
- Outcome
- red light-induced increasese0
- Direction
- reversiblee0
Not reportedComparator
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“These red light-induced increases are mediated by phytochrome, as they are reversible by alternating exposures to red and far-red light”
Claim · model-written summary
Dark-grown plastids contained abundant starch and few lamellae.
- Taxon
- Sphaerocarpos donnellii Aust.Sphaerocarpos donnelliit0
- Organ / stage
- Plastidse0
- Outcome
- full of starch and develop few lamellaee0
- Comparator
- light-grown plastidse0
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“Plastids from dark-grown plants are full of starch and develop few lamellae, while light-grown plastids contain little starch and have many lamellae”
Claim · model-written summary
Light-grown plastids contained little starch and many lamellae.
- Taxon
- Sphaerocarpos donnellii Aust.Sphaerocarpos donnelliit0
- Organ / stage
- light-grown plastidse0
- Outcome
- little starch and have many lamellaee0
- Comparator
- dark-grown plantse0
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“Plastids from dark-grown plants are full of starch and develop few lamellae, while light-grown plastids contain little starch and have many lamellae”
Claim · model-written summary
Starch determinations showed a phytochrome-mediated decrease in starch content.
- Taxon
- Sphaerocarpos donnellii Aust.Sphaerocarpos donnelliit0
- Gene
- phytochromee0
- Outcome
- starch contente0
- Direction
- decreasee0
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“starch determinations which revealed a phytochrome-mediated decrease in starch content”
Claim · model-written summary
The extra chlorophyll and nitrogen increase under white rather than red light was not mediated by photosynthetic activity.
Verbatim
t0“Sphaerocarpos donnellii Aust.”
e0“The effect of white light in increasing the chlorophyll and nitrogen content above the level attained in red light-treated plants is not mediated by photosynthetic activity”