Abstract
Parameters of sugar beet ( Beta vulgaris L.) leaf senescence were investigated in the stage of vegetative growth in plants grown at normal nitrate level (N) or under its deficiency (DefN). Accelerated senescence was initiated by the 41-h-long exposure of leaf discs on the surface of water with alternating darkness and light. In plants grown at DefN, the number of leaves and their average area decreased; after the incubation of the discs from such leaves on water, the content of soluble carbohydrates (sCarb) and especially of glucose sharply increased as compared with normal level of nitrate (N), whereas the content of soluble protein (sProt) and Rubisco activity considerably decreased, which is characteristic of the negative hexokinase (HXK1) effect of glucose. The rate of a decrease in the content of sProt in the course of leaf senescence calculated for the leaf of each strorey was lower than the rate of a decrease in RuBisCO activity. A decrease in the content of sProt and RuBisCO activity in all the storeys of leaves grown at joint action of nitrate deficit (DefN) and incubation on water was on the average greater than in each of these treatments separately but less than the sum of these effects. The imperfection of the putative mechanism of signal transduction at DefN and excess glucose and their interaction in senescent sugar beet leaves is discussed as well as the opportunity to use the ratio between sCarb and sProt for the evaluation of the manifestation of the negative hexokinase effect of glucose.
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Claims 9
Claim · model-written summary
Nitrate deficiency decreased the number of sugar beet leaves.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- DefNe0
- Outcome
- number of leavese0
- Direction
- decreasede0
- Comparator
- normal nitrate level (N)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plants grown at DefN, the number of leaves and their average area decreased”
e1“plants grown at normal nitrate level (N) or under its deficiency (DefN)”
t0“sugar beet”
Claim · model-written summary
Nitrate deficiency decreased average leaf area.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- DefNe0
- Outcome
- average areae0
- Direction
- decreasede0
- Comparator
- normal nitrate level (N)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plants grown at DefN, the number of leaves and their average area decreased”
e1“plants grown at normal nitrate level (N) or under its deficiency (DefN)”
t0“sugar beet”
Claim · model-written summary
Leaf discs from nitrate-deficient plants showed sharply increased soluble carbohydrate content after water incubation.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- incubation of the discs from such leaves on watere0
- Outcome
- content of soluble carbohydrates (sCarb)e0
- Direction
- sharply increasede0
- Comparator
- normal level of nitrate (N)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after the incubation of the discs from such leaves on water, the content of soluble carbohydrates (sCarb) and especially of glucose sharply increased as compared with normal level of nitrate (N)”
t0“sugar beet”
Claim · model-written summary
Leaf discs from nitrate-deficient plants showed especially increased glucose after water incubation.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- incubation of the discs from such leaves on watere0
- Outcome
- glucosee0
- Direction
- sharply increasede0
- Comparator
- normal level of nitrate (N)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after the incubation of the discs from such leaves on water, the content of soluble carbohydrates (sCarb) and especially of glucose sharply increased as compared with normal level of nitrate (N)”
t0“sugar beet”
Claim · model-written summary
Soluble protein content decreased considerably in nitrate-deficient leaf discs after water incubation.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- incubation of the discs from such leaves on watere1
- Outcome
- content of soluble protein (sProt)e0
- Direction
- considerably decreasede0
- Comparator
- normal level of nitrate (N)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of soluble protein (sProt) and Rubisco activity considerably decreased”
e1“after the incubation of the discs from such leaves on water”
e2“as compared with normal level of nitrate (N)”
t0“sugar beet”
Claim · model-written summary
Rubisco activity decreased considerably in nitrate-deficient leaf discs after water incubation.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- incubation of the discs from such leaves on watere1
- Outcome
- Rubisco activitye0
- Direction
- considerably decreasede0
- Comparator
- normal level of nitrate (N)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of soluble protein (sProt) and Rubisco activity considerably decreased”
e1“after the incubation of the discs from such leaves on water”
e2“as compared with normal level of nitrate (N)”
t0“sugar beet”
Claim · model-written summary
During senescence, soluble protein content declined more slowly than RuBisCO activity.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- rate of a decrease in the content of sProte0
- Direction
- lowere0
- Comparator
- rate of a decrease in RuBisCO activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of a decrease in the content of sProt in the course of leaf senescence calculated for the leaf of each strorey was lower than the rate of a decrease in RuBisCO activity”
t0“sugar beet”
Claim · model-written summary
Combined nitrate deficit and water incubation decreased soluble protein content more than either treatment alone but less than the sum of their effects.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- joint action of nitrate deficit (DefN) and incubation on watere0
- Outcome
- content of sProte0
- Direction
- greatere0
- Qualifier
- less than the sum of these effectse0
- Comparator
- each of these treatments separatelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in the content of sProt and RuBisCO activity in all the storeys of leaves grown at joint action of nitrate deficit (DefN) and incubation on water was on the average greater than in each of these treatments separately but less than the sum of these effects”
t0“sugar beet”
Claim · model-written summary
Combined nitrate deficit and water incubation decreased RuBisCO activity more than either treatment alone but less than the sum of their effects.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- joint action of nitrate deficit (DefN) and incubation on watere0
- Outcome
- RuBisCO activitye0
- Direction
- greatere0
- Qualifier
- less than the sum of these effectse0
- Comparator
- each of these treatments separatelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in the content of sProt and RuBisCO activity in all the storeys of leaves grown at joint action of nitrate deficit (DefN) and incubation on water was on the average greater than in each of these treatments separately but less than the sum of these effects”
t0“sugar beet”
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See all 66 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.