Cold Treatment Modulates Changes in Primary Metabolites and Flowering of Cut Flower Tulip Hybrids

Tulip is one of the most important bulbous genera in world’s floriculture. It known that cold exposure bulbs before planting required to break bulb dormancy and promote plant’s flowering. Preparation procedures performed by breeders differ duration thermal level, choice procedure depends on genotype’s sensitivity temperature; however, little about metabolic responses underlying different behaviours numerous commercial hybrids. We evaluated influence two bulb-preparation procedures, 15–18 weeks at 5 ÷ 9 °C, 9–14 2 hybrids tulip (Tulipa gesneriana L.), ‘Royal Virgin’ ‘Ad Rem’, grown hydroponically a floating system. plants responded differently low temperatures terms early flowering, as this was unaffected preparation (27.1 days from transplanting, average), while it earlier after treatment higher compared with lower Rem’ (24.1 vs. 26.7 °C °C). This flowering earliness may be related diverse enacted for acclimation depended hybrid x treatment. Plant leaf area flower stem characteristics were similar procedure.