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Annals of Botany 39: 413-421, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Assimilate Distribution in Poa annua L.

CHIN K. ONG and C. MARSHALL

School of Plant Biology, University College of North Wales Bangor, Gwynedd

Received: 17 July 1974   

The carbon economy of a flowering tiller of Poa annua L. has been examined over the period from inflorescence emergence to grain shedding. The total import of 14C by the inflorescence reached a maximum at late grain filling but the relative import of assimilate was greatest 14 days after its appearance and represented 20–25 per cent of that assimilated by the inflorescence itself. The inflorescence continued to be an important assimilatory organ after grain ripening when it exported more than 50 per cent of its assimilate to the stem, roots and other tillers.

The patterns of distribution of assimilates from the youngest uppermost and the oldest green leaf of the reproductive tiller were largely determined by the stage of development of the inflorescence. The youngest leaf mainly supported the inflorescence up to the end of the grain-filling stage but then supplied assimilates basally to the roots and adjacent tillers. The oldest green leaf supported the growth of the stem and the inflorescence up to anthesis but after this supplied assimilates mainly to the roots and tillers.

Removal of grains or the entire inflorescence only 1 h before supplying 14CO2 greatly reduced the rate of fixation of 14CO2 and the export of radiocarbon, as well as changing the pattern of distribution of assimilates within the plant. The significance of these results is discussed and comparisons made with cereals and perennial grasses.


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