Lifting time and bulb storage temperature influenceNerine sarniensisflowering time and flower quality

Abstract

Flowering in Nerine sarniensis was manipulated by a combination of lifting dates and storage temperature treatments. Bulbs were lifted in either October (late spring) or December (early summer) then either replanted immediately (control) or stored at 38C or 308C for 4 or 8 weeks before replanting. For bulbs that were lifted in October and stored at 308C for either 4 or 8 weeks, flower bud emergence occurred 27Á29 days earlier than bulbs from the control treatment, whereas for those stored at 38C, flower bud emergence was delayed by up to 23 days. In contrast, for bulbs lifted in December and stored at 308C, flower buds emerged at a similar time to the control, whereas those stored at 38C were delayed by up to 41 days. Subsequent development from flower bud emergence to first floret opening was primarily influenced by the prevailing temperature conditions in all treatments, with 92% of the variation being accounted for by soil temperature alone. The proportion of bulbs that flowered was not markedly altered by storage conditions except that it was reduced where bulbs were stored at 38C for 8 weeks at the December lifting time. Flower quality (stem length, floret number) was not markedly impacted by the treatments used.

The Influence of Bulb Storage Regimes on the Growth and Flowering of Hippeastrum (Hippeastrum hybridum Hort.)

“…These results are in agreement with the previously shown optimal conditions for stem elongation and anthesis of geophytic plants which includes a several-week period of lower temperatures (4-9  C), while the absence of a low-temperature treatment leads to slow shoot growth (Khodorova and Boitel-Conti, 2013). The impacts of bulb treatment temperature on flower scape length were also revealed in a study by Warrington et al (2011) on Nerine sarniensis (a geophytic plant). The results demonstrated that flower scape length increased in the 3  C treatment bulbs compared with stems from the control bulbs, while the stem length decreased in the 30  C treatments (Warrington et al, 2011).…”

“…These results were in agreement with the report of De Hertogh and Gallitano (1998) who found that there were no significant effects of the packing system on floret diameter or the number of florets per scape. The study of Warrington et al (2011) on Nerine sarniensis had similar results in that the effects of temperature on floret number were minor.…”

“…The impacts of bulb treatment temperature on flower scape length were also revealed in a study by Warrington et al (2011) on Nerine sarniensis (a geophytic plant). The results demonstrated that flower scape length increased in the 3  C treatment bulbs compared with stems from the control bulbs, while the stem length decreased in the 30  C treatments (Warrington et al, 2011). The paper also proposed that the production of auxin and gibberellin is affected by the surrounding temperature and probably plays one of the leading roles in geophyte growth regulation.…”

Warm Bulb Storage Optimises Flowering Attributes and Foliage Characteristics in Amaryllis belladonna L.

“…In further elucidating this flowering oddity, the most intriguing finding was that the collective proportion of the 0 and 12-week storage treatments accounted for 59.3% (more than half) of the overall maturation performance yield. It can be inferred that in this study, the longer continuous warm bulb storage conditions for the completion of the rest period were met, and flower emergence was prompted by a particular cumulative temperature range and duration for the last stages of floral differentiation before planting [26,37,38]. However, the shorter storage periods and the timing of the subsequent greenhouse temperature fluctuations because of an earlier planting time after storage may have affected the receptive signalling pathways and transitional apical meristematic activity, resulting in noticeable aberrations of stunted spike emergence and inflorescence abortion [26].…”

“…Storage significantly impacted the flower diameter and number of days before flowering in Hippeastrum [36] and accelerated flowering in Eucomis species [37]. Other Amaryllidaceae genera that flourish in hot, dry summer areas and respond to warm storage techniques include Narcissus species, Nerine flexuosa, and N. sarniensis [38]. According to [24], standardised forcing protocols make an analysis and comparison extremely challenging; therefore, clarifying the processes that modify these factors in floricultural crops is essential to achieve sustainable production and increased product quality.…”