Abstract
In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids. In the light, total amino nitrogen increased for the first few hours, then stabilized; in the dark, there was a transient decrease followed by a gradual recovery. Asparagine, homoserine, alanine, and glutamine accounted for much of these changes. The incorporation of (15)N into various components of the young leaves was followed after supply of (15)N-nitrate. (15)N appeared most rapidly in ammonia, due to reduction in the leaf, and this process took place predominantly in the light. A large proportion of the primary assimilation took place through the amide group of glutamine, which became labeled and turned over rapidly; labeling of glutamic acid and alanine was also rapid. Asparagine (amide group) soon became labeled and showed considerable turnover. Slower incorporation and turnover were found for aspartic acid, gamma-aminobutyric acid, and homoserine. Synthesis and turnover of all of the amino acids continued at a low rate in the dark. gamma-Aminobutyric acid was the only compound found to label more rapidly in the dark than in the light.
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Claims 11
Claim · model-written summary
Amino acid levels in young pea leaves showed a diurnal variation.
- Taxon
- Pisum sativum
Lathyrus oleraceuse1 - Organ / stage
- young leavese1
- Outcome
- levels of amino acidse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
Claim · model-written summary
In the light, total amino nitrogen in pea young leaves increased for the first few hours and then stabilized.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- lighte2
- Outcome
- total amino nitrogene2
- Direction
- increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“In the light, total amino nitrogen increased for the first few hours, then stabilized”
Claim · model-written summary
In the dark, total amino nitrogen in pea young leaves showed a transient decrease followed by a gradual recovery.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- darke3
- Outcome
- total amino nitrogene2
- Direction
- transient decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“In the light, total amino nitrogen increased for the first few hours, then stabilized”
e3“in the dark, there was a transient decrease followed by a gradual recovery”
Claim · model-written summary
Asparagine, homoserine, alanine and glutamine accounted for much of the amino acid changes in pea young leaves.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Compound
- Asparagine, homoserine, alanine, and glutaminee2
- Outcome
- these changese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“Asparagine, homoserine, alanine, and glutamine accounted for much of these changes”
Claim · model-written summary
15N from supplied 15N-nitrate appeared most rapidly in ammonia in pea young leaves, through reduction in the leaf, predominantly in the light.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- (15)N-nitratee6
- Compound
- ammoniae5
- Outcome
- (15)N appeared most rapidly in ammoniae5
- Qualifier
- predominantly in the lighte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e5“(15)N appeared most rapidly in ammonia, due to reduction in the leaf, and this process took place predominantly in the light”
e6“The incorporation of (15)N into various components of the young leaves was followed after supply of (15)N-nitrate”
Claim · model-written summary
Most primary assimilation in pea young leaves went through the amide group of glutamine, which became labeled and turned over rapidly.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Compound
- glutaminee7
- Outcome
- became labeled and turned over rapidlye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e7“A large proportion of the primary assimilation took place through the amide group of glutamine, which became labeled and turned over rapidly”
Claim · model-written summary
Glutamic acid and alanine in pea young leaves were labeled rapidly.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Compound
- glutamic acid and alaninee2
- Outcome
- labelinge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“labeling of glutamic acid and alanine was also rapid”
Claim · model-written summary
Asparagine in pea young leaves became labeled and showed considerable turnover.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Compound
- Asparaginee2
- Outcome
- became labeled and showed considerable turnovere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“Asparagine (amide group) soon became labeled and showed considerable turnover”
Claim · model-written summary
Aspartic acid, gamma-aminobutyric acid and homoserine in pea young leaves showed slower incorporation and turnover.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Compound
- aspartic acid, gamma-aminobutyric acid, and homoserinee2
- Outcome
- incorporation and turnovere2
- Direction
- Slowere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“Slower incorporation and turnover were found for aspartic acid, gamma-aminobutyric acid, and homoserine”
Claim · model-written summary
Synthesis and turnover of the amino acids in pea young leaves continued at a low rate in the dark.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Outcome
- Synthesis and turnovere2
- Qualifier
- continued at a low rate in the darke2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“Synthesis and turnover of all of the amino acids continued at a low rate in the dark”
Claim · model-written summary
Gamma-aminobutyric acid was the only compound in pea young leaves labeled more rapidly in the dark than in the light.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- darke2
- Compound
- gamma-Aminobutyric acide2
- Outcome
- label more rapidlye2
- Direction
- more rapidlye2
- Comparator
- lighte2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In the young leaves of pea (Pisum sativum L.) plants, there was a diurnal variation in the levels of amino acids”
e2“gamma-Aminobutyric acid was the only compound found to label more rapidly in the dark than in the light”