Effects of alpha-hydroxy-2-pyridinemethanesulfonic acid on photosynthetic carbon dioxide uptake and stomatal movements in excised tomato leaves

The effects of 10-2 M α-hydroxy-2-pyridinemethanesulfonic acid (αHPMS) on the CO2 compensation point, photosynthetic CO2 uptake, CO2 evolution into CO2-free air in light, and stomatal movement, in excised tomato leaves (Lycopersicon esculentum Mill. Eurocross $\text{BB-F}_{1}$ Hybrid) were studied....

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1977-07, Vol.60 (1), p.44-46
Main Author: Khavari Nejad R.A
Format: Article
Language:English
Subjects:
Carbon dioxide
Chloroplasts
Glycolates
Leaves
Oxidases
Petioles
Photosynthesis
Plants
Stomata
Stomatal movement
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Summary:The effects of 10-2 M α-hydroxy-2-pyridinemethanesulfonic acid (αHPMS) on the CO2 compensation point, photosynthetic CO2 uptake, CO2 evolution into CO2-free air in light, and stomatal movement, in excised tomato leaves (Lycopersicon esculentum Mill. Eurocross $\text{BB-F}_{1}$ Hybrid) were studied. It was found that α-HPMS had a transient lowering effect on the CO2 compensation point of treated leaves within the first 5 minutes of application. The net photosynthetic CO2 uptake was inhibited by α-HPMS treatment. The inhibition increased with time and was enhanced in an O2-free atmosphere. The CO2 evolution into CO2-free air in light was inhibited by α-HPMS. The inhibition was O2-dependent because the effect was observed only in 21% O2 but not in O2-free N2. Stomatal apertures were affected by α-HPMS, but the effect was transient and was observed 15 to 30 minutes after the application. The time course of this closure did not account for the observed inhibition of net CO2 uptake.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.60.1.44