Abstract
Why benzyladenine (BA) retards chlorophyll degradation of rice leaf segments, but does not prevent it was investigated. When BA solutions bathing segments of rice leaves were replaced daily, the effect of BA was not enhanced. Solutions of BA kept at 27°C in the dark for 4 days were as active as fresh solutions. It seems unlikely, therefore, that the decrease in the chlorophyll content with increased incubation time in BA-treated leaf segments is caused by inactivation of BA either in the leaves or in solution. Of 25 L-amino acids at 50 mM added singly with BA, 19 were antagonistic to the effect of BA on chlorophyll content, but four, L-arginine, L-histidine, L-lysine and L-methionine, significantly enhanced the effect of BA. The effects of amino acids decreased with a decrease in the amino acid concentration or an increase in BA concentration. When concentrations were decreased to 5 mM, only L-lysine slightly increased the chlorophyll content in BA-treated leaf segments. L-Proline and L-tryptophan did not modify the effect of BA on chlorophyll content. Effects of amino acids on chlorophyll content in leaf segments without BA treatment are similar to those with BA. Furthermore, cycloheximide (50 μg/ml), which decreased the soluble amino acid content, increased the chlorophyll content in BA-treated leaf segments. Since an accumulation of soluble amino acids precedes the degradation of chlorphyll in BA-treated leaf segments, probably antagonisms caused by the amino acids accumulated in the tissue, prevent the added BA from being fully effective in stopping chlorophyll loss.
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Claims 14
Claim · model-written summary
Daily replacement of benzyladenine did not enhance its effect.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- leavese0
- Treatment
- replaced dailye0
- Outcome
- effect of BAe0
- Direction
- not enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When BA solutions bathing segments of rice leaves were replaced daily, the effect of BA was not enhanced”
Claim · model-written summary
Stored benzyladenine solution was as active as fresh solution.
- Taxon
- riceOryza sativat0
- Treatment
- BA kept at 27°C in the dark for 4 dayse0
- Outcome
- activee0
- Direction
- as active ase0
- Comparator
- fresh solutionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Solutions of BA kept at 27°C in the dark for 4 days were as active as fresh solutions”
t0“rice leaves”
Claim · model-written summary
Nineteen of 25 amino acids antagonized the benzyladenine effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-amino acids at 50 mM added singly with BAe0
- Outcome
- chlorophyll contente0
- Direction
- antagonistice0
- Value
- 19e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of 25 L-amino acids at 50 mM added singly with BA, 19 were antagonistic to the effect of BA on chlorophyll content”
t0“rice leaves”
Claim · model-written summary
L-arginine enhanced the benzyladenine effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-argininee0
- Outcome
- chlorophyll contente1
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-arginine, L-histidine, L-lysine and L-methionine, significantly enhanced the effect of BA”
e1“effect of BA on chlorophyll content, but four”
t0“rice leaves”
Claim · model-written summary
L-histidine enhanced the benzyladenine effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-histidinee0
- Outcome
- chlorophyll contente1
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-arginine, L-histidine, L-lysine and L-methionine, significantly enhanced the effect of BA”
e1“effect of BA on chlorophyll content, but four”
t0“rice leaves”
Claim · model-written summary
L-lysine enhanced the benzyladenine effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-lysinee0
- Outcome
- chlorophyll contente1
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-arginine, L-histidine, L-lysine and L-methionine, significantly enhanced the effect of BA”
e1“effect of BA on chlorophyll content, but four”
t0“rice leaves”
Claim · model-written summary
L-methionine enhanced the benzyladenine effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-methioninee0
- Outcome
- chlorophyll contente1
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-arginine, L-histidine, L-lysine and L-methionine, significantly enhanced the effect of BA”
e1“effect of BA on chlorophyll content, but four”
t0“rice leaves”
Claim · model-written summary
Amino acid effects weakened with lower amino acid concentration or higher BA concentration.
- Taxon
- riceOryza sativat0
- Treatment
- amino acid concentratione0
- Outcome
- effects of amino acidse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of amino acids decreased with a decrease in the amino acid concentration or an increase in BA concentration”
t0“rice leaves”
Claim · model-written summary
At 5 mM, only L-lysine slightly increased chlorophyll in BA-treated leaves.
- Taxon
- riceOryza sativat0
- Treatment
- L-lysinee0
- Outcome
- chlorophyll contente0
- Direction
- increasede0
- Value
- 5 mMe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When concentrations were decreased to 5 mM, only L-lysine slightly increased the chlorophyll content in BA-treated leaf segments”
t0“rice leaves”
Claim · model-written summary
L-Proline did not modify the BA effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-Prolinee0
- Outcome
- chlorophyll contente0
- Direction
- did not modifye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-Proline and L-tryptophan did not modify the effect of BA on chlorophyll content”
t0“rice leaves”
Claim · model-written summary
L-tryptophan did not modify the BA effect on chlorophyll.
- Taxon
- riceOryza sativat0
- Treatment
- L-tryptophane0
- Outcome
- chlorophyll contente0
- Direction
- did not modifye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-Proline and L-tryptophan did not modify the effect of BA on chlorophyll content”
t0“rice leaves”
Claim · model-written summary
Amino acids had similar effects on chlorophyll without BA.
- Taxon
- riceOryza sativat0
- Treatment
- amino acidse0
- Outcome
- chlorophyll contente0
- Direction
- similare0
- Comparator
- with BAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of amino acids on chlorophyll content in leaf segments without BA treatment are similar to those with BA”
t0“rice leaves”
Claim · model-written summary
Cycloheximide reduced soluble amino acids and increased chlorophyll in BA-treated leaves.
- Taxon
- riceOryza sativat0
- Treatment
- cycloheximide (50 μg/ml)e0
- Outcome
- chlorophyll contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cycloheximide (50 μg/ml), which decreased the soluble amino acid content, increased the chlorophyll content in BA-treated leaf segments”
t0“rice leaves”
Claim · model-written summary
Accumulated amino acids probably antagonized BA and prevented full inhibition of chlorophyll loss.
- Taxon
- riceOryza sativat0
- Outcome
- chlorophyll losse0
- Qualifier
- amino acids accumulated in the tissuee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“probably antagonisms caused by the amino acids accumulated in the tissue, prevent the added BA from being fully effective in stopping chlorophyll loss”
t0“rice leaves”
The same questions in other papers
N-benzyladenine · physiology: pigments · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →L-alpha-amino acid · physiology: pigments · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- negative
L-lysine · physiology: pigments · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
L-proline · physiology: pigments · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- no effect
L-tryptophan · physiology: pigments · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- no effect
cycloheximide · physiology: pigments · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
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.