Abstract
It has been reported that carbonic anhydrase (CA) activity in plant leaves is decreased by Zn deficiency. We examined the effects of Zn deficiency on the activity of CA and on photosynthesis by leaves in rice plants (Oryza sativa L.). Zn deficiency increased the transfer resistance from the stomatal cavity to the site of CO2 fixation 2. 3-fold and, consequently, the value of the transfer resistance relative to the total resistance in the CO2-assimilation process increased from 10% to 21%. This change led to a reduced CO2 concentration at the site of CO2 fixation, resulting in an increased gradient of CO2 between the stomatal cavity and this site. The present findings support the hypothesis that CA functions to facilitate the supply of CO2 from the stomatal cavity to the site of CO2 fixation. We also showed that the level of mRNA for CA decreased to 13% of the control level during Zn deficiency. This decrease resembled the decrease in CA activity, suggesting the possible involvement of the CA mRNA level in the regulation of CA activity.
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Claims 7
Claim · model-written summary
Zn deficiency increased resistance to CO2 transfer from the stomatal cavity to fixation sites 2.3-fold in rice leaves.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- leavese1
- Treatment
- Zn deficiencye0
- Outcome
- transfer resistance from the stomatal cavity to the site of CO2 fixatione0
- Direction
- increasede0
- Value
- 2. 3-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn deficiency increased the transfer resistance from the stomatal cavity to the site of CO2 fixation 2. 3-fold”
e1“leaves in rice plants (Oryza sativa L.)”
Claim · model-written summary
The share of total CO2 assimilation resistance attributable to transfer resistance rose from 10% to 21%.
- Taxon
- riceOryza sativae1
- Treatment
- Zn deficiencye2
- Outcome
- transfer resistance relative to the total resistance in the CO2-assimilation processe0
- Direction
- increasede0
- Value
- 10% to 21%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the value of the transfer resistance relative to the total resistance in the CO2-assimilation process increased from 10% to 21%”
e1“rice plants (Oryza sativa L.)”
e2“Zn deficiency increased”
Claim · model-written summary
The change reduced CO2 concentration at the fixation site.
- Taxon
- riceOryza sativae1
- Outcome
- CO2 concentration at the site of CO2 fixatione0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This change led to a reduced CO2 concentration at the site of CO2 fixation”
e1“rice plants (Oryza sativa L.)”
Claim · model-written summary
The CO2 gradient between the stomatal cavity and fixation site increased.
- Taxon
- riceOryza sativae1
- Outcome
- gradient of CO2 between the stomatal cavity and this sitee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increased gradient of CO2 between the stomatal cavity and this site”
e1“rice plants (Oryza sativa L.)”
Claim · model-written summary
The authors interpret carbonic anhydrase as facilitating CO2 supply to the fixation site.
- Taxon
- riceOryza sativae1
- Gene
- CAe0
- Outcome
- supply of CO2 from the stomatal cavity to the site of CO2 fixatione0
- Qualifier
- facilitatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CA functions to facilitate the supply of CO2 from the stomatal cavity to the site of CO2 fixation”
e1“rice plants (Oryza sativa L.)”
Claim · model-written summary
CA mRNA fell to 13% of control during zinc deficiency.
- Taxon
- riceOryza sativae1
- Treatment
- Zn deficiencye0
- Gene
- CAe0
- Outcome
- level of mRNA for CAe0
- Direction
- decreasede0
- Value
- 13%e0
- Comparator
- control levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of mRNA for CA decreased to 13% of the control level during Zn deficiency”
e1“rice plants (Oryza sativa L.)”
Claim · model-written summary
The fall in CA mRNA resembled the fall in CA activity, suggesting that mRNA level may regulate activity.
- Taxon
- riceOryza sativae1
- Gene
- CAe0
- Outcome
- regulation of CA activitye0
- Qualifier
- possible involvement of the CA mRNA levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This decrease resembled the decrease in CA activity, suggesting the possible involvement of the CA mRNA level in the regulation of CA activity”
e1“rice plants (Oryza sativa L.)”
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See all 24 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.