Influence of Shade on the Growth and Sink Activity of Young Flower Heads and Peduncles of White Clover (Trifolium repens L.)

The influence of shade on the growth and sink activity of young flower heads and peduncles of white clover (Trifolium repens L.) plants was measured in controlled environments. Measurement of the peduncle elongation rate using a linear voltage displacement transducer showed that when the inflorescen...

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Bibliographic Details
Published in:Journal of experimental botany 1991-06, Vol.42 (6), p.705-710
Main Authors: PASUMARTY, S. V., MINCHIN, P. E. H., FOUNTAIN, D. W., THOMAS, R. G.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Clover
Coefficients
Flowers
Fundamental and applied biological sciences. Psychology
Inflorescences
Leaves
Memory interference
partitioning
Peduncle
Physical agents
Plant physiology and development
Plants
Transducers
translocation
Vegetation canopies
Vegetative apparatus, growth and morphogenesis. Senescence
White clover
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Summary:The influence of shade on the growth and sink activity of young flower heads and peduncles of white clover (Trifolium repens L.) plants was measured in controlled environments. Measurement of the peduncle elongation rate using a linear voltage displacement transducer showed that when the inflorescence alone was shaded, peduncle elongation was higher than in the light. Translocation studies using 11C-labelling techniques showed that shading the inflorescence alone had little effect on translocation of assimilates into the inflorescence but induced a major change in partitioning of assimilates within it. Peduncle elongation induced by shade accompanied an increase in partitioning of photoassimilates to the peduncle, at the expense of the flower head.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/42.6.705