Role of phytochrome in photoperiodic regulation of bulbing and growth in the long day plant Allium cepa |
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Authors: | Bartolomeo Lercari |
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Affiliation: | Istitito di Orticoltura e Floricoltura della Universitàdegli Studi di Pisa, Viale delle Piagge, 23, 56100 Pisa, Italy |
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Abstract: | Plant elongation in Allium cepa L. cv. Dorata di Parma was stimulated by end-of-day far-red radiation, while the same treatment was ineffective with respect to bulbing response. It was concluded that the Pfr-dependent reactions which control bulbing are completed during the long daily light period (18 h). Day breaks of 3 h fluorescent white light, in the middle of the inductive photoperiod were inhibitory to bulbing. Repeated brief far-red irradiations could substitute for continuous far-red irradiations lasting 3 h in the middle of the photoperiod. Red light alone or applied immediately after each far-red irradiation inhibits bulb formation. |
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Keywords: | Elongation far-red light onion red light reversibility |
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