Floral bud reversion in Impatiens balsamina under non-inductive photoperiods
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All floral buds of Impatiens balsamina plants exposed to 4 short-day (SD) cycles and then returned to long days reverted to vegetative growth. The same happened with the upper buds of plants receiving a larger number of SDs, even as many as 90 cycles. The reversal proceeded in a basipetal order. The number of floral buds and flowers increased, and their reversion to vegetative growth was delayed with increasing numbers of SD cycles. Depending upon the stage attained by the floral bud before the transfer of the plant to noninductive photoperiods one or more inner whorls of the flower were replaced by a vegetative apex. The tip of the placenta was able to resume vegetative growth even after the formation of fertile anthers and an ovary with abortive ovules, showing that the potentiality for reversion is maintained till quite late stages in floral bud development. Continuous exposure to SD cycles is required not only for the continued production of floral buds, but also for their development to mature flowers, indicating that the floral stimulus in this plant is not “self-perpetuating”.
KeywordsLate Stage Vegetative Growth Continuous Exposure Continue Production Mature Flower
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- Brulfert, J.: Action de l'acide gibberellique sur l'expression des fleures prolifères chez Anagallis arvensis L. C. R. Acad. Sci. (Paris) 253, 517–519 (1961).Google Scholar
- —, et P. Chouard: Nouvelles observations sur la production experimentale de fleures prolifères chez Anagallis arvensis L. C. R. Acad. Sci. (Paris) 253, 171–181 (1961).Google Scholar
- Guyot, M., et P. Gavaudau: Tératologie florale, virescence et realisation sexuelle chez les Cruciféres. C. R. Soc. Biol. (Paris) 155, 2006–2008 (1961).Google Scholar
- Lang, A.: Physiology of flower initiation. In: Encyclopedia of plant physiology (W. Ruhland, ed.), vol. 15, pt. I, p. 1380–1536. Berlin-Heidelberg-New York: Springer 1965.Google Scholar
- Lona, F.: Sui fenomeni di induzione, post-effetto e localizzasione fotoperiodialli di Xanthium italicum Moretti. Nuovo Giorn. bot. ital., N. S. 53, 548–576 (1946).Google Scholar
- Nanda, K. K., and H. N. Krishnamoorthy: Photoperiodic studies on growth and development of Impatiens balsamina L. II. Floral bud initiation, flower opening and extension growth. Planta (Berl.) 72, 338–343 (1967).Google Scholar
- —— T. A. Anuradha, and Krishan Lal: Floral induction by gibberellic acid in Impatiens balsamina L., a qualitative short day plant. Planta (Berl.) 76, 367–370 (1967).Google Scholar
- Zeevaart, J. A. D.: Flower formation as studied by grafting. Meded. Landbouwhogesch. Wageningen 58, No 3 (1958).Google Scholar