Abstract
We have investigated the spatial distributions of cell division rate, p34(cdc2) kinase activity, and amount of p34(cdc2a) in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions. An original method for calculating cell division rate in all leaf tissues is proposed. In all studied conditions, cell division rate was stable and maximum in the first 2 cm beyond the leaf insertion point, declined afterward, and reached zero at 7 cm from the insertion point. The spatial distribution of p34(cdc2) kinase activity, expressed on a per cell basis, followed the same pattern. In contrast, the amount of p34(cdc2a) was maximum in the first centimeter of the leaf, declined afterward, but remained at 20% of maximum in more distal zones with a near-zero cell division rate. A mild water deficit caused a reduction in cell division rate and p34(cdc2) kinase activity by approximately 45% in all leaf zones, but did not affect the amount of p34(cdc2a). Growth temperature affected to the same extent cell division rate and p34(cdc2) kinase activity, but only if p34(cdc2) kinase activity was assayed at growth temperature, and not if a standard temperature was used in all assays. A common linear relationship between cell division rate and p34(cdc2) kinase activity applied to all causes of changes in cell division rate, i.e. cell aging, water deficit, or changes in temperature. It is shown that temperature has two distinct and additive effects on p34(cdc2) kinase activity; first, an effect on the rate of the reaction, and second, an effect on the amount of p34(cdc2a).
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Claims 8
Claim · model-written summary
In all studied conditions, cell division rate in maize leaves was stable and maximal in the first 2 cm beyond the leaf insertion point, declined afterward, and reached zero at 7 cm.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“In all studied conditions, cell division rate was stable and maximum in the first 2 cm beyond the leaf insertion point, declined afterward, and reached zero at 7 cm from the insertion point”
Claim · model-written summary
The spatial distribution of p34(cdc2) kinase activity per cell followed the same pattern as cell division rate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“The spatial distribution of p34(cdc2) kinase activity, expressed on a per cell basis, followed the same pattern”
Claim · model-written summary
The amount of p34(cdc2a) was maximal in the first centimeter of the leaf and declined afterward, but remained at 20% of maximum in distal zones with near-zero cell division rate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“the amount of p34(cdc2a) was maximum in the first centimeter of the leaf, declined afterward, but remained at 20% of maximum in more distal zones with a near-zero cell division rate”
Claim · model-written summary
A mild water deficit reduced cell division rate and p34(cdc2) kinase activity by approximately 45% in all leaf zones.
- Organ / stage
- leaf zonese1
- Treatment
- A mild water deficite1
- Outcome
- cell division rate and p34(cdc2) kinase activitye1
- Direction
- reductione1
- Value
- approximately 45%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“A mild water deficit caused a reduction in cell division rate and p34(cdc2) kinase activity by approximately 45% in all leaf zones”
Claim · model-written summary
A mild water deficit did not affect the amount of p34(cdc2a).
- Treatment
- A mild water deficite1
- Gene
- p34(cdc2a)e1
- Outcome
- amount of p34(cdc2a)e1
- Direction
- did not affecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“A mild water deficit caused a reduction in cell division rate and p34(cdc2) kinase activity by approximately 45% in all leaf zones, but did not affect the amount of p34(cdc2a)”
Claim · model-written summary
Growth temperature affected cell division rate and p34(cdc2) kinase activity to the same extent, but only if kinase activity was assayed at growth temperature and not at a standard temperature.
- Treatment
- Growth temperaturee1
- Outcome
- cell division rate and p34(cdc2) kinase activitye1
- Direction
- affectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“Growth temperature affected to the same extent cell division rate and p34(cdc2) kinase activity, but only if p34(cdc2) kinase activity was assayed at growth temperature, and not if a standard temperature was used in all assays”
Claim · model-written summary
A common linear relationship between cell division rate and p34(cdc2) kinase activity applied to all causes of change in cell division rate (cell aging, water deficit, temperature).
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“A common linear relationship between cell division rate and p34(cdc2) kinase activity applied to all causes of changes in cell division rate”
Claim · model-written summary
Temperature has two distinct and additive effects on p34(cdc2) kinase activity: one on the rate of the reaction and one on the amount of p34(cdc2a).
- Treatment
- temperaturee1
- Gene
- p34(cdc2a)e1
- Outcome
- p34(cdc2) kinase activitye1
- Qualifier
- two distinct and additive effectse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize (Zea mays) leaves grown at contrasting temperatures and soil water conditions”
e1“temperature has two distinct and additive effects on p34(cdc2) kinase activity; first, an effect on the rate of the reaction, and second, an effect on the amount of p34(cdc2a)”
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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.