Assimilation of 14CO2 by the Inflorescence of Poa annua L. and Lolium perenne L. |
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Authors: | ONG, C. K. COLVILL, K. E. MARSHALL, C. |
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Affiliation: | School of Plant Biology, University College of North Wales Bangor,Gwynedd LL57 2UW, Wales |
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Abstract: | The relative assimilatory activity of the inflorescence, itsindividual components, and the leaves of flowering tillers ofPoa annua L. and Lolium perenneL. was determined over the periodfrom inflorescence emergence to seed shedding. The pattern of14CO2 fixation was similar for both species and the inflorescencewas by far the most important assimilatory organ of the reproductivetiller, particularly over the latter period of seed developmentas leaf senescence progressed. With the exception of the seedsall parts of the inflorescence showed significant assimilatoryactivity and the lemmas and paleas accounted for 4050per cent of the total 14C fixed by the inflorescence in bothspecies. The importance of the grass inflorescence as a photosyntheticstructure is discussed in relation to similar studies on cereals. Poa annua, Lolium perenne, carbon dioxide assimilation, inflorescence |
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