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Inducing flowering in growing plants of overwintered onions effects of supplementary irradiation photoperiod nitrogen growing medium and gibberellins

Inducing flowering in growing plants of overwintered onions effects of supplementary irradiation photoperiod nitrogen growing medium and gibberellins

Journal of Horticultural Science 64(3): 301-312

The induction of inflorescences in growing plants of bolting resistant, overwintered onion genotypes was studied in glasshouse conditions in a series of nine experiments between 1978 and 1987. Plants raised in perlite sub-irrigated by nutrient solution grew faster and flowered more freely than those raised in John Innes compost. The percentage of plants with inflorescences was usually increased by supplementary irradiation and by sowing in early July or sooner, rather than in August. The percentage flowering of some genotypes was increased by a restricted nitrogen supply during chilling or by photoperiod extension during chilling. Such photoperiod extension advanced the date of influorescence appearance. GA3 injection prior to chilling increased the flowering percentage of some genotypes. A combination of supplementary irradiation and low nitrogen levels prior to and during chilling and 4 h or 6 h photoperiod extensions during chilling resulted in 80 to 100% flowering from an early August sowing of highly bolting resistant genotypes. Using this regime a twelve month seed-to-seed time is possible with such lines.

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Accession: 007449596

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DOI: 10.1080/14620316.1989.11515958

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