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Annals of Botany 39: 403-411, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Pattern and Control of Distribution of 14C-assimilates in Reproductive Plants of Lolium multiflorum Lam. var. Westerwoldicum

P. E. CLIFFORD1 and R. H. M. LANGER

Lincoln College Canterbury, New Zealand

1 Present address: Department of Botany, Queen's University, Belfast.

Received: 13 June 1974   

The distribution of 14C-assimilates was examined in reproductive plants of Lolium multiflorum Lam. var. Westerwoldicum (cv. Tama) from which all emerged tillers had been removed, leaving the main tiller with two expanding leaves, one of them the flag leaf, and two expanded leaves. Export of 14C from the lower expanded leaf was mainly to the tiller in its axil, the stem internode below its node and the roots, whereas the upper expanded leaf supplied predominantly the expanding leaves, the ear, stem internodes, roots and the tiller bud in the axil of the lower leaf. Defoliation and root-pruning showed that expanding leaves were able to compete successfully for assimilates, probably through the production of substances capable of mobilizing supply. Local application of 1-naphthaleneacetic acid (NAA), gibberellic acid (GA3) and 6-benzylaminopurine (BAP) to small tiller buds showed that GA3 and BAP promoted bud growth and 14C accumulation, but that addition of NAA reduced these effects.


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