Abstract
Enzyme activities of assimilatory sulfate reduction were measured in leaves of Pisum sativum L., cv. Vatters Frühbusch, during their ontogenetic development, and during treatment with H 2 S and cyst(e)ine. Ribulose bisphosphate (RuBP) carboxylase (EC 4.1.1.39) and ferredoxin‐dependent nitrite reductase (Fd‐NiR, EC 1.7.7.1) were measured for comparison. In etiolated pea leaves, ATP‐sulfurylase (ATPase, EC 2.7.7.4), adenosine 5′‐phosphosulfate sulfotransferase (APSSTase), ferredoxin‐dependent sulfite reductase (Fd‐SiR, EC 1.8.7.1) and O‐acetyl‐L‐serine sulfhydrylase (OASSase, EC 4.2.99.8) activities were measured in appreciable rates, while neither RuBP carboxylase nor Fd‐NiR activities could be detected. During the first 2–7 days after transfer into the light all enzyme activities increased. After reaching maximal activities, ATPase, APSSTase, and Fd‐SiR activities decreased in all leaves to low or indetectable levels during the following 3–6 days. RuBP carboxylase, Fd‐NiR and OASSase, on the other hand, decreased slowly and were still at high levels of activity at the end of the experiment. Fumigation of pea plants with 1.5 μl l −1 H 2 S delayed the initial increase and the subsequent decrease of ATPase activity by 1–3 days. APSSTase activity decreased for 1–2 days, increased rapidly during the next 4–6 days and retained a high level of activity until the end of the experiment as did Fd‐SiR. One to two days after the beginning of fumigation the leaves started to accumulate high amounts of cyst(e)ine. When pea plants with excised roots were placed on a nutrient solution containing cyst(e)ine, APSSTase activity decreased more on 0.2 and 0.5 m M than on 1.0 m M. Fd‐SiR activity was only slightly decreased on 1.0 m M cyst(e)ine. Neither Fd‐NiR nor RuBP carboxylase activities were affected.
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Claims 12
Claim · model-written summary
Etiolated pea leaves had appreciable ATP-sulfurylase, APSSTase, Fd-SiR and OASSase activity.
- Taxon
- pea
Lathyrus oleraceuse0 - Organ / stage
- etiolated pea leavese0
- Gene
- ATP‐sulfurylasee0
- Outcome
- activities were measured in appreciable ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In etiolated pea leaves, ATP‐sulfurylase (ATPase, EC 2.7.7.4), adenosine 5′‐phosphosulfate sulfotransferase (APSSTase), ferredoxin‐dependent sulfite reductase (Fd‐SiR, EC 1.8.7.1) and O‐acetyl‐L‐serine sulfhydrylase (OASSase, EC 4.2.99.8) activities were measured in appreciable rates”
Claim · model-written summary
Etiolated pea leaves had no detectable RuBP carboxylase or Fd-NiR activity.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- neither RuBP carboxylase nor Fd‐NiR activities could be detectede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while neither RuBP carboxylase nor Fd‐NiR activities could be detected”
t0“Pisum sativum”
Claim · model-written summary
All measured enzyme activities increased in the first 2–7 days after transfer to light.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- transfer into the lighte0
- Outcome
- all enzyme activitiese0
- Direction
- increasede0
- Value
- 2–7 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first 2–7 days after transfer into the light all enzyme activities increased”
t0“Pisum sativum”
Claim · model-written summary
ATPase, APSSTase and Fd-SiR activities fell to low or undetectable levels after their maxima.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Organ / stage
- leavese0
- Outcome
- ATPase, APSSTase, and Fd‐SiR activitiese0
- Direction
- decreasede0
- Value
- 3–6 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATPase, APSSTase, and Fd‐SiR activities decreased in all leaves to low or indetectable levels during the following 3–6 days”
t0“Pisum sativum”
Claim · model-written summary
RuBP carboxylase, Fd-NiR and OASSase activities declined slowly and remained high at experiment end.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- RuBP carboxylase, Fd‐NiR and OASSasee0
- Direction
- decreased slowlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RuBP carboxylase, Fd‐NiR and OASSase, on the other hand, decreased slowly and were still at high levels of activity at the end of the experiment”
t0“Pisum sativum”
Claim · model-written summary
H2S fumigation delayed the rise and fall of pea ATPase activity by 1–3 days.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- Fumigation of pea plants with 1.5 μl l −1 H 2 Se0
- Outcome
- ATPase activitye0
- Direction
- delayede0
- Value
- 1–3 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fumigation of pea plants with 1.5 μl l −1 H 2 S delayed the initial increase and the subsequent decrease of ATPase activity by 1–3 days”
Claim · model-written summary
Under H2S fumigation APSSTase activity declined briefly, then rose rapidly and stayed high.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- H2Se1
- Outcome
- APSSTase activitye0
- Direction
- increased rapidlye0
- Value
- 4–6 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APSSTase activity decreased for 1–2 days, increased rapidly during the next 4–6 days and retained a high level of activity until the end of the experiment”
e1“Fumigation of pea plants with 1.5 μl l −1 H 2 S delayed the initial increase and the subsequent decrease of ATPase activity by 1–3 days”
t0“Pisum sativum”
Claim · model-written summary
Fd-SiR activity remained high until experiment end under fumigation.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- H2Se1
- Outcome
- Fd‐SiRe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“retained a high level of activity until the end of the experiment as did Fd‐SiR”
e1“Fumigation of pea plants with 1.5 μl l −1 H 2 S delayed the initial increase and the subsequent decrease of ATPase activity by 1–3 days”
t0“Pisum sativum”
Claim · model-written summary
Pea leaves accumulated high cyst(e)ine amounts one to two days after fumigation began.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- fumigatione0
- Outcome
- high amounts of cyst(e)inee0
- Direction
- accumulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One to two days after the beginning of fumigation the leaves started to accumulate high amounts of cyst(e)ine”
t0“Pisum sativum”
Claim · model-written summary
Cyst(e)ine at 0.2 and 0.5 m M depressed APSSTase activity more than 1.0 m M.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- 0.2 and 0.5 m Me0
- Outcome
- APSSTase activitye0
- Direction
- decreased moree0
- Comparator
- 1.0 m Me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APSSTase activity decreased more on 0.2 and 0.5 m M than on 1.0 m M”
t0“Pisum sativum”
Claim · model-written summary
At 1.0 m M cyst(e)ine, Fd-SiR activity decreased only slightly.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- 1.0 m M cyst(e)inee0
- Outcome
- Fd‐SiR activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fd‐SiR activity was only slightly decreased on 1.0 m M cyst(e)ine”
t0“Pisum sativum”
Claim · model-written summary
Cyst(e)ine did not affect Fd-NiR or RuBP carboxylase activity.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- cyst(e)inee1
- Outcome
- Fd‐NiR nor RuBP carboxylase activitiese0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither Fd‐NiR nor RuBP carboxylase activities were affected”
e1“One to two days after the beginning of fumigation the leaves started to accumulate high amounts of cyst(e)ine”
t0“Pisum sativum”
The same questions in other papers
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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.