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Bulbing in long-day onion (Allium cepa L.) cultured in vitro: Comparison between sugar feeding and light induction

Kahane R., Teyssendier de la Serve B., Rancillac M.. 1992. Annals of Botany, 69 (6) : p. 551-555.

DOI: 10.1093/oxfordjournals.aob.a088385

Bulbs were obtained on onion plants cultured in vitro. No bulbing happened under long days with fluorescent light and 30¿40 g l-1 sucrose. Bulb formation was mainly dependent either on sucrose concentration in the culture medium, or on light spectral composition. Raising the sucrose concentration from 40 to 120 g l-1 increased plant basal swelling and stopped further vegetative development. These plants were not dormant. When fluorescent light was enriched in incandescence during a long day period, bulbs were obtained in two months and underwent a consecutive dormancy.

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