Abstract
【Objective】To ascertain the influence of different light conditions on root Fe3+ reductase activity of iron-deficient cucumber plants.【Method】The effects of different light conditions on Fe3+ reductase activity in Fe-deficiency cucumber (Cucumis stativus L.) were studied in solution culture. Fe3+ reductase activity in roots of cucumber plants,chlorophyll content in leaves of cucumber seedling,soluble total sugar and sucrose content in shoot and root of cucumber plants,Fe uptake were determined by spectrophotography under different light intensities and Fe nutritional status. Shoot and roots dry weights and root/shoot ratio of cucumber plants were weighed and counted. 【Result】The results showed that Fe3+ reductase activity of Fe-deficiency plants under 4.5 d light intensityⅠ+1.5 d light intensityⅡ,6 d light intensityⅡ,4.5 d light intensityⅠ+1.5 d darkness decreased respectively by 68.9%,84.6% and 93.1% to the 6 d light intensityⅠ. Comparing to changes of chlorophyll,Fe and carbohydrate contents in plants under different light treatments,we know there no direct relations between effects of light on Fe3+ reductase activity and changes of chlorophyll were observed,but significant relations to accumulation of carbohydrate from shoots to roots and Fe uptake in shoots of cucumber plants were observed,demonstrating the effects of carbohydrate and Fe on Fe3+ reductase activity by light is a direct reaction. The changes between Fe3+ reductase activity and chlorophyll,Fe and carbohydrate contents in plants were not identical under 4.5 d light intensityⅠ+1.5 d darkness. However the changes between Fe3+ reductase activity and Fe contents of shoot tip in plants were identical under different light treatments.【Conclusion】 The Fe3+ reductase activity in Fe-deficiency cucumber was obviously regulated by carbohydrate contents of roots,and physiological demand of shoot for iron under different light conditions. Fe contents of shoot tip could be an good physiological demand index for iron supply in cucumber plants.
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Claims 11
Claim · model-written summary
First light regimen reduced root Fe3+ reductase activity by 68.9% versus six days of intensity I.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- 4.5 d light intensityⅠ+1.5 d light intensityⅡe0
- Outcome
- Fe3+ reductase activitye0
- Direction
- decreasede0
- Value
- 68.9%e0
- Comparator
- 6 d light intensityⅠe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe3+ reductase activity of Fe-deficiency plants under 4.5 d light intensityⅠ+1.5 d light intensityⅡ,6 d light intensityⅡ,4.5 d light intensityⅠ+1.5 d darkness decreased respectively by 68.9%,84.6% and 93.1% to the 6 d light intensityⅠ.”
t0“cucumber”
Claim · model-written summary
Six days of intensity II reduced root Fe3+ reductase activity by 84.6%.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 6 d light intensityⅡe0
- Outcome
- Fe3+ reductase activitye0
- Direction
- decreasede0
- Value
- 84.6%e0
- Comparator
- 6 d light intensityⅠe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe3+ reductase activity of Fe-deficiency plants under 4.5 d light intensityⅠ+1.5 d light intensityⅡ,6 d light intensityⅡ,4.5 d light intensityⅠ+1.5 d darkness decreased respectively by 68.9%,84.6% and 93.1% to the 6 d light intensityⅠ.”
t0“cucumber”
Claim · model-written summary
Intensity I followed by darkness reduced root Fe3+ reductase activity by 93.1%.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 4.5 d light intensityⅠ+1.5 d darknesse0
- Outcome
- Fe3+ reductase activitye0
- Direction
- decreasede0
- Value
- 93.1%e0
- Comparator
- 6 d light intensityⅠe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe3+ reductase activity of Fe-deficiency plants under 4.5 d light intensityⅠ+1.5 d light intensityⅡ,6 d light intensityⅡ,4.5 d light intensityⅠ+1.5 d darkness decreased respectively by 68.9%,84.6% and 93.1% to the 6 d light intensityⅠ.”
t0“cucumber”
Claim · model-written summary
Light effects on reductase activity had no direct relation to chlorophyll changes.
- Taxon
- cucumberCucumis sativust0
- Compound
- chlorophylle0
- Outcome
- Fe3+ reductase activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there no direct relations between effects of light on Fe3+ reductase activity and changes of chlorophyll were observed”
t0“cucumber”
Claim · model-written summary
Reductase changes were significantly related to carbohydrate accumulation from shoots to roots.
- Taxon
- cucumberCucumis sativuse0
- Compound
- carbohydratee0
- Outcome
- accumulation of carbohydrate from shoots to rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant relations to accumulation of carbohydrate from shoots to roots and Fe uptake in shoots of cucumber plants were observed”
t0“cucumber”
Claim · model-written summary
Reductase changes were significantly related to shoot Fe uptake.
- Taxon
- cucumberCucumis sativuse0
- Compound
- Fee0
- Outcome
- Fe uptake in shootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant relations to accumulation of carbohydrate from shoots to roots and Fe uptake in shoots of cucumber plants were observed”
t0“cucumber”
Claim · model-written summary
Under light followed by darkness, reductase changes did not match chlorophyll, Fe and carbohydrate changes.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 4.5 d light intensityⅠ+1.5 d darknesse0
- Outcome
- Fe3+ reductase activity and chlorophyll,Fe and carbohydrate contentse0
- Direction
- not identicale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The changes between Fe3+ reductase activity and chlorophyll,Fe and carbohydrate contents in plants were not identical under 4.5 d light intensityⅠ+1.5 d darkness.”
t0“cucumber”
Claim · model-written summary
Reductase changes matched shoot-tip Fe changes across light treatments.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- shoot tipe0
- Compound
- Fee0
- Outcome
- Fe3+ reductase activitye0
- Direction
- identicale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the changes between Fe3+ reductase activity and Fe contents of shoot tip in plants were identical under different light treatments.”
t0“cucumber”
Claim · model-written summary
Authors infer root carbohydrate content regulates reductase activity under light treatments.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- rootse0
- Compound
- carbohydratee0
- Outcome
- Fe3+ reductase activitye0
- Qualifier
- different light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Fe3+ reductase activity in Fe-deficiency cucumber was obviously regulated by carbohydrate contents of roots,and physiological demand of shoot for iron under different light conditions.”
Claim · model-written summary
Authors infer shoot iron demand regulates reductase activity under light treatments.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- shoote0
- Compound
- irone0
- Outcome
- Fe3+ reductase activitye0
- Qualifier
- different light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Fe3+ reductase activity in Fe-deficiency cucumber was obviously regulated by carbohydrate contents of roots,and physiological demand of shoot for iron under different light conditions.”
Claim · model-written summary
Shoot-tip Fe content was proposed as an index of iron supply demand.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- shoot tipe0
- Outcome
- physiological demand index for iron supplye0
- Value
- goode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe contents of shoot tip could be an good physiological demand index for iron supply in cucumber plants.”
The same questions in other papers
light · physiology: enzyme activity · Cucumis sativus (cucumber)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- positive
- positive
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3 papers more in this group
See all 7 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.