Untersuchungen zum Gaswechsel der Rebe <p>I. Einfluß von Temperatur, Blattalter und Tageszeit auf Nettophotosynthese und Transpiration</p>
DOI:
https://doi.org/10.5073/vitis.1982.21.93-100Abstract
An verschiedenen Rebsorten wurde unter Laborbedingungen (30 klx, 50 % ) der Einfluß von Temperatur, Blattalter und Tageszeit auf die Nettophotosyntheserate (NPR) und Transpirationsrate (TR) an Gewächshauspflanzen ermittelt.
- Das Optimum der NPR lag bei 25 °C, während die TR von 10 °C bis 30 °C annähernd linear anstieg.
- Die höchste NPR hatten gerade ausgewachsene Blätter; ältere Blätter zeigten eine etwas geringere, jüngere eine deutlich verminderte NPR. Die Verhältnisse bei der TR waren ähnlich, aber weniger ausgeprägt und zu den jüngeren Blättern hin verschoben.
- Bei trocken kultivierten Pflanzen kam es im Laufe des Tages zu einer starken Reduktion der NPR and TR um etwa 2/a der Werte des Vormittags, nicht dagegen bei ausreichender Wasserversorgung.
Investigations on gas exchange in grapevine
I. Influence of temperature, leaf age and daytime on net photosynthesis and transpiration
The influence of temperature, leaf age and daytime on the rates of net photosynthesis and transpiration was measured under constant environmental conditions in greenhouse-grown plants of different varieties.
- The temperature optimum of net photosynthesis was at 25 °C whereas transpiration increased nearly linear from 10 °C to 30 °C.
- The highest rates of net photosynthesis possessed just fully grown leaves; older leaves showed a minor, younger leaves a more pronounced reduction. The pattern of transpiration rates was nearly the same, but not that distinct.
- Plants grown under drought conditions reduced their rates of net photosynthesis and transpiration during daytime very strongly (by 2/3 of the rates early in the morning). whereas in watered plants this influence could not be observed.
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