Abstract
The extractable activity of sucrose phosphate synthase was determined in etiolated seedlings of maize (Zea mays L.), soybean (Glycine max [L.] Merr.), and sugar beet (Beta vulgaris L.) following treatments of changing light quality. A 30-minute illumination of 30 microeinsteins per square meter per second white light produced a three-fold increase in sucrose phosphate synthase activity at 2 hours postillumination when compared to seedlings maintained in total darkness. Etiolated maize seedlings treated with 3.6 microeinsteins per square meter per second of red and far-red light showed a 50% increase and a 50% decrease in sucrose phosphate synthase activity, respectively, when compared to etiolated maize seedlings treated with white light. Maize seedlings exposed for 30 minutes to red followed by 30 minutes to far-red showed an initial increase in sucrose phosphate synthase activity followed by a rapid decrease to control level. Neither soybean or sugar beet sucrose phosphate synthase responded to the 30-minute illumination of white light. Phytochrome is involved in sucrose phosphate synthase regulation in maize, whereas it is not responsible for changes in sucrose phosphate synthase activity in soybean or sugar beet.
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Claims 7
Claim · model-written summary
White light increased sucrose phosphate synthase activity threefold compared with darkness.
- Treatment
- white lighte1
- Outcome
- sucrose phosphate synthase activitye1
- Direction
- increasee1
- Value
- three-folde1
- Comparator
- seedlings maintained in total darknesse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of maize (Zea mays L.), soybean (Glycine max [L.] Merr.), and sugar beet (Beta vulgaris L.)”
e1“A 30-minute illumination of 30 microeinsteins per square meter per second white light produced a three-fold increase in sucrose phosphate synthase activity at 2 hours postillumination when compared to seedlings maintained in total darkness”
Claim · model-written summary
Red light increased maize sucrose phosphate synthase activity by 50% relative to white light.
- Treatment
- rede0
- Outcome
- sucrose phosphate synthase activitye0
- Direction
- increasee0
- Value
- 50%e0
- Comparator
- white lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Etiolated maize seedlings treated with 3.6 microeinsteins per square meter per second of red and far-red light showed a 50% increase and a 50% decrease in sucrose phosphate synthase activity, respectively, when compared to etiolated maize seedlings treated with white light”
Claim · model-written summary
Far-red light decreased maize sucrose phosphate synthase activity by 50% relative to white light.
- Treatment
- far-red lighte0
- Outcome
- sucrose phosphate synthase activitye0
- Direction
- decreasee0
- Value
- 50%e0
- Comparator
- white lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Etiolated maize seedlings treated with 3.6 microeinsteins per square meter per second of red and far-red light showed a 50% increase and a 50% decrease in sucrose phosphate synthase activity, respectively, when compared to etiolated maize seedlings treated with white light”
Claim · model-written summary
Sequential red then far-red light initially increased maize enzyme activity, then rapidly reduced it to control level.
- Treatment
- red followed by 30 minutes to far-rede0
- Outcome
- sucrose phosphate synthase activitye0
- Direction
- initial increasee0
- Comparator
- control levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize seedlings exposed for 30 minutes to red followed by 30 minutes to far-red showed an initial increase in sucrose phosphate synthase activity followed by a rapid decrease to control level”
Claim · model-written summary
Soybean enzyme activity did not respond to 30 minutes of white light.
- Taxon
- soybean
Glycine maxe0 - Treatment
- 30-minute illumination of white lighte0
- Outcome
- soybean or sugar beet sucrose phosphate synthasee0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither soybean or sugar beet sucrose phosphate synthase responded to the 30-minute illumination of white light”
Claim · model-written summary
Sugar beet enzyme activity did not respond to 30 minutes of white light.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise0 - Treatment
- 30-minute illumination of white lighte0
- Outcome
- soybean or sugar beet sucrose phosphate synthasee0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither soybean or sugar beet sucrose phosphate synthase responded to the 30-minute illumination of white light”
Claim · model-written summary
Phytochrome was implicated in maize sucrose phosphate synthase regulation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phytochrome is involved in sucrose phosphate synthase regulation in maize”
The same questions in other papers
light · molecular: metabolites · Beta vulgaris (beet)Positive and negative results
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- positive
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See all 5 papers →light · physiology: enzyme activity · Zea mays (maize)Positive and negative results
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- no effect
- negative
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See all 19 papers →light · molecular: metabolites · Glycine max (soybean)Positive and negative results
20 papers in the same direction as this paper · 27 in the opposite direction
- positive
- positive
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44 papers more in this group
See all 48 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.