Acquisition of competence for floral development in Nicotiana buds

Grafting experiments were used to investigate the relative roles of strength of flowering signal(s) and competence of buds to respond to flowering signal(s) in the development of photoperiodic and day-neutral species of Nicotiana. At the time of commitment to floral development, a flowering signal (...

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Bibliographic Details
Published in:Planta 1992-11, Vol.188 (4), p.546-550
Main Authors: Singer, S.R, Hannon, C.H, Huber, S.C
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Biology and morphogenesis of the reproductive apparatus. Photoperiodism, vernalisation
buds
cell differentiation
crop growth stage
floral determination
Flower buds
Flowering
Flowers
Fundamental and applied biological sciences. Psychology
Graftage
grafting
Internodes
Leaves
Nicotiana sylvestris
Nicotiana tabacum
photoperiodism
Plant physiology and development
Plants
Scions
Seedlings
Tissue grafting
Vegetative and sexual reproduction, floral biology, fructification
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Summary:Grafting experiments were used to investigate the relative roles of strength of flowering signal(s) and competence of buds to respond to flowering signal(s) in the development of photoperiodic and day-neutral species of Nicotiana. At the time of commitment to floral development, a flowering signal (inhibitory or promotive) could reach a critical level or terminal buds could gain competence to perceive and-or respond to an existing signal. The latter hypothesis appears to be true for day-neutral N. tabacum L. cv. Wisconsin 38, while signal strength appears to be a more critical factor for long-day N. silvestris. L. Nicotiana tabacum and N. silvestris differ in terms of signal intensity at anthesis of the terminal flower. Stocks of N. silvestris promote more rapid flowering in seedling scions of both genotypes. Terminal buds of seedlings of both genotypes have the same competence to respond to the signal affecting floral development. The competence of the terminal bud of both species to respond to this signal(s) changes as a function of age.
ISSN:0032-0935
1432-2048
DOI:10.1007/BF00197047