Morphological and physiological aspects of flower initiation and development in Tanacetum cinerariaefolium L.

TL;DRAbstract

This study investigated the morphological and physiological changes associated with flower initiation and development in pyrethrum, Tanacetum cinerariaefolium L. Detailed morphological descriptions of vegetative and floral apices have been given and a scale of reproductive developmental stages based on these descriptions was proposed. It was shown that each stage of apical development was associated with a narrow range of apical diameters. The irreversible commitment to floral development was observed to occur when the first involucral bract was initiated on the apical dome and this point was characterised by a critical apical size. The apical diameter at this stage was always approximately 220 pm. A juvenile-like condition was described for pyrethrum seedlings, tissue culture explants and vegetatively divided splits. During the period of juvenile-like growth the plants were not competent to respond to normally inductive treatments. The juvenile-like phase lasted until the plants had r

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