Abstract: | Zusammenfassung Die Photosyntheseintensität von intakten und entgraunten Gerstenähren im Blühstadium wurde gemessen und aus beiden Werten die Photosyntheserate der Grannen ermittelt. Der Anteil der Grannen an der Photosynthesetätigkeit der gesamten Ähre betrug bei der zweizeiligen Sommergerste Haisa über 70%, bei der sechszeiligen Wintergerste Peragis Mittelfrühe fast 80% und bei der weißspelzigen Mutanteeburata etwa 85%. Die entgrannten Ähren voneburata gaben auch im Licht CO2 ab.
Summary The photosynthetic rate of flowering barley ears was measured before and after detaching the awns and from both values the photosynthetic rate of the awns calculated. The contribution of awns to the photosynthetic activity of the intact ear was about 70 per cent in Haisa , about 80 per cent in Peragis Mittelfrühe , and in the mutanteburata with white glumes and green awns about 85 per cent. The awnless ears ofeburata showed a CO2-output in light.
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