Abstract
SUMMARY When light‐grown plants of mutant 1073 of Lemna aequinoctialis Welwitsch were grown in a medium containing 31 μ l ‐cystine, the tubular clusters characteristic of this mutant disappeared in the mature fronds and chloroplasts and mitochondria appeared normal. l ‐Methionine (2 μ) effected a similar but less dramatic change. In young fronds, however, 10% of chloroplasts when supplied with l ‐cystine, and 50% when supplied with l ‐methionine, still contained tubular clusters. When l ‐cystine was supplied to young fronds of the wild‐type strain 6746, chloroplasts were normal but contained much larger starch inclusions. Relative growth rates of both strains were improved by addition of l ‐cystine or l ‐methionine. In mutant fronds they attained values equivalent to wild‐type control. This partial recovery from ultrastructural defects was not matched by a physiological recovery, i.e. plants were still incapable of photosynthesis and ammonium ion uptake, as were mutant plants in control media. Moreover when the partially recovered plants were tested for ammonium ion uptake, in the presence of either l ‐methionine or l ‐cystine, ammonium ions from plants moved out into the medium during the first 24 h, while increased ammonium uptake was detected with the wild strain.
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Claims 12
Claim · model-written summary
Cystine removed tubular clusters in mature mutant fronds, and organelles appeared normal.
- Taxon
- Lemna aequinoctialis Welwitsch
Lemna aequinoctialise0 - Material
- mutant 1073e0
- Organ / stage
- mature frondse0
- Treatment
- 31 μ l ‐cystinee0
- Outcome
- tubular clusterse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When light‐grown plants of mutant 1073 of Lemna aequinoctialis Welwitsch were grown in a medium containing 31 μ l ‐cystine, the tubular clusters characteristic of this mutant disappeared in the mature fronds and chloroplasts and mitochondria appeared normal”
Claim · model-written summary
Methionine produced a similar but weaker structural improvement.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Treatment
- l ‐Methionine (2 μ)e0
- Outcome
- less dramatic changee0
- Direction
- less dramatice0
- Comparator
- l‐CYSTINEt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“l ‐Methionine (2 μ) effected a similar but less dramatic change”
t0“LEMNA AEQUINOCTIALIS WELWITSCH * 1073 TREATED WITH l‐METHIONINE OR l‐CYSTINE”
Claim · model-written summary
Ten percent of young mutant chloroplasts retained clusters with cystine.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Organ / stage
- young frondse0
- Outcome
- chloroplasts when supplied with l ‐cystine, and 50% when supplied with l ‐methionine, still contained tubular clusterse0
- Value
- 10%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In young fronds, however, 10% of chloroplasts when supplied with l ‐cystine, and 50% when supplied with l ‐methionine, still contained tubular clusters”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Fifty percent of young mutant chloroplasts retained clusters with methionine.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Outcome
- still contained tubular clusterse0
- Value
- 50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“50% when supplied with l ‐methionine, still contained tubular clusters”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Cystine enlarged starch inclusions in wild type chloroplasts.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Material
- wild‐type strain 6746e0
- Treatment
- l ‐cystinee0
- Outcome
- starch inclusionse0
- Direction
- much largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When l ‐cystine was supplied to young fronds of the wild‐type strain 6746, chloroplasts were normal but contained much larger starch inclusions”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Cystine improved relative growth rates in both strains.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Treatment
- l ‐cystinee0
- Outcome
- Relative growth ratese0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative growth rates of both strains were improved by addition of l ‐cystine or l ‐methionine”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Methionine improved relative growth rates in both strains.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Treatment
- l ‐methioninee0
- Outcome
- Relative growth ratese0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative growth rates of both strains were improved by addition of l ‐cystine or l ‐methionine”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Mutant growth rates reached wild type control levels.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Outcome
- values equivalent to wild‐type controle0
- Comparator
- wild‐type controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In mutant fronds they attained values equivalent to wild‐type control”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Structural recovery did not restore photosynthesis.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Outcome
- incapable of photosynthesise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants were still incapable of photosynthesis and ammonium ion uptake”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Structural recovery did not restore ammonium uptake.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Outcome
- ammonium ion uptakee0
- Direction
- incapablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants were still incapable of photosynthesis and ammonium ion uptake”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Ammonium ions exited recovered mutant plants during the first day.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Outcome
- ammonium ions from plants moved out into the mediume0
- Qualifier
- first 24 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ammonium ions from plants moved out into the medium during the first 24 h”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”
Claim · model-written summary
Wild strain ammonium uptake increased.
- Taxon
- LEMNA AEQUINOCTIALISLemna aequinoctialist0
- Material
- wild straine0
- Outcome
- ammonium uptakee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased ammonium uptake was detected with the wild strain”
t0“LEMNA AEQUINOCTIALIS WELWITSCH”