Abstract
The possibility of improving the recovery of plant photosynthesis after water stress by cytokinin-induced stimulation of stomatal opening or delay of leaf senescence was tested. The 6-benzylaminopurine (BAP) in concentrations 1 and 10 μM was applied to the substrate (sand + nutrient solution) or sprayed on primary leaves of 14-d-old Phaseolus vulgaris L. plants sufficiently supplied with water or water-stressed for 4 d. The later ones having relative water content decreased to 69 % were fully rehydrated during the following three days. Parameters of photosynthesis and water relations were measured in primary leaves of 7-, 10-, 14-, and 17-d-old plants. Application of 1 μM BAP slightly delayed leaf senescence: in 17-d-old control plants, net photosynthetic rate (PN) and chlorophyll (Chl) content, and when sprayed on leaves also some of Chl a fluorescence kinetic parameters of BAP-treated leaves were slightly higher than those of untreated leaves. Both types of application of 1 μM BAP slightly improved recovery of plants during rehydration after water stress in terms of increased gad, gab and PN, i.e., parameters which were markedly decreased by mild water stress. However, contents of Chl a, Chl b and carotenoids and parameters of Chl a fluorescence kinetic were not markedly affected by mild water stress and after rehydration were not stimulated by 1 μM BAP. 10 μM BAP had mostly negative effects on the parameters measured.
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Claims 8
Claim · model-written summary
At 1 μM, BAP slightly delayed leaf senescence in control bean plants.
- Taxon
- Phaseolus vulgaris L.
Phaseolus vulgarise1 - Treatment
- 1 μM BAPe0
- Outcome
- leaf senescencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 1 μM BAP slightly delayed leaf senescence”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
In 17-day-old controls, BAP-treated leaves had slightly higher net photosynthetic rate and chlorophyll content than untreated leaves.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Organ / stage
- leavese0
- Treatment
- BAP-treatede0
- Outcome
- net photosynthetic rate (PN) and chlorophyll (Chl) contente0
- Direction
- highere0
- Comparator
- untreated leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 17-d-old control plants, net photosynthetic rate (PN) and chlorophyll (Chl) content, and when sprayed on leaves also some of Chl a fluorescence kinetic parameters of BAP-treated leaves were slightly higher than those of untreated leaves”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
Sprayed BAP-treated leaves also had slightly higher chlorophyll a fluorescence kinetic parameters than untreated leaves.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Organ / stage
- leavese0
- Treatment
- BAP-treatede0
- Outcome
- Chl a fluorescence kinetic parameterse0
- Direction
- highere0
- Comparator
- untreated leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when sprayed on leaves also some of Chl a fluorescence kinetic parameters of BAP-treated leaves were slightly higher than those of untreated leaves”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
Both 1 μM BAP application routes slightly increased stomatal conductance parameters and net photosynthetic rate during rehydration after water stress.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Treatment
- 1 μM BAPe0
- Outcome
- gad, gab and PNe0
- Direction
- increasede0
- Qualifier
- during rehydration after water stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both types of application of 1 μM BAP slightly improved recovery of plants during rehydration after water stress in terms of increased gad, gab and PN”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
Mild water stress markedly decreased gad, gab and PN.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Treatment
- mild water stresse0
- Outcome
- gad, gab and PNe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gad, gab and PN, i.e., parameters which were markedly decreased by mild water stress”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
Mild water stress did not markedly affect chlorophyll a, chlorophyll b or carotenoid contents or chlorophyll a fluorescence kinetics.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Treatment
- mild water stresse0
- Outcome
- contents of Chl a, Chl b and carotenoidse0
- Direction
- not markedly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contents of Chl a, Chl b and carotenoids and parameters of Chl a fluorescence kinetic were not markedly affected by mild water stress”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
After rehydration, 1 μM BAP did not stimulate pigment contents or chlorophyll a fluorescence kinetics.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Treatment
- 1 μM BAPe0
- Outcome
- parameters of Chl a fluorescence kinetice0
- Direction
- not stimulatede0
- Qualifier
- after rehydratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contents of Chl a, Chl b and carotenoids and parameters of Chl a fluorescence kinetic were not markedly affected by mild water stress and after rehydration were not stimulated by 1 μM BAP”
e1“Phaseolus vulgaris L. plants”
Claim · model-written summary
At 10 μM, BAP had mostly negative effects on measured parameters.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarise1
- Treatment
- 10 μM BAPe0
- Outcome
- parameters measurede0
- Direction
- negative effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10 μM BAP had mostly negative effects on the parameters measured”
e1“Phaseolus vulgaris L. plants”
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