Abstract
DURING a recent study of the effect of temperature and photoperiod on spikelet initiation in Lolium1, continuous artificial light supplied by ‘daylight’ fluorescent lamps was used for examining ‘ripeness-to-flower’ of the shoot apex. If an apex is ‘ripe-to-flower’, that is, competent to respond to the photoperiodic stimulus, spikelet development begins at once on exposure to continuous light. In some species, such as the Mediterranean annuals L. temulentum, L. remotum and L. gaudini, the shoot apex is competent immediately after germination; in others, such as L. italicum and most plants of L. rigidum, the apex eventually becomes competent, but this process is accelerated by low temperature; and in most strains of L. perenne competence is never attained in the absence of low temperature.
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Cooper, J. P., J. Ecol. (in the press).
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COOPER, J., MONEY-KYRLE, A. Inflorescence Development in Lolium during the Arctic Summer. Nature 169, 158 (1952). https://doi.org/10.1038/169158a0
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DOI: https://doi.org/10.1038/169158a0
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