(66) Modeling Flower Bud Development of Impatiens hawkeri and I. walleriana

Faust, James E.; Lewis, Kelly P.

doi:10.21273/hortsci.40.4.1013a

Cited by 4 publications

(3 citation statements)

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“…Bud development models are helpful to growers when their crop will flower based on the bud size and species. Faust and Lewis (2005) reported for new guinea impatiens that time to flower was 31, 43, and 72 d from visible bud at 25, 20, and 15 C, respectively, and bud width increased linearly from 1 to 9 mm. The new guinea impatiens were slightly slower than hybrid impatiens examined in the present study, and bud expansion of the hybrid impatiens was curvilinear from 2 to 10 mm.…”

Section: Resultsmentioning

confidence: 93%

Modeling the Effect of Temperature on the Flower Development Rate of Hybrid Impatiens

Vargo

Faust

2022

hortte

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The effect of average daily temperature (ADT) on flower bud development and subsequent time to flower was investigated on hybrid impatiens (Impatiens ×hybrida) cultivars Compact Electric Orange, Compact Hot Coral, and Compact Orchid Blush. Plants with a visible flower bud measuring 2 mm in width were placed in one of the four greenhouses with temperature setpoints ranging from 16 to 28 °C. Flower bud width was measured every 3 days in each ADT treatment until flowering. The subsequent days to flower (DTF) from the onset of a visible bud decreased from 36 to 27 days as the ADT increased from 17 to 28 °C. The DTF from visible bud varied by <3 days among the three cultivars across all temperatures; therefore, cultivar data were pooled to create a stronger prediction model. A logistic formula was used to predict the remaining DTF as a function of flower bud width and ADT. The model accurately described the effect of bud width and ADT on flowering time within ±3 days for 87% of the actual DTF across all three cultivars. The resulting flower development model provides greenhouse growers with a guide for manipulating temperature to produce flowering plants for specific market dates based on flower bud width measurements.

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Section: Resultsmentioning

confidence: 93%

Modeling the Effect of Temperature on the Flower Development Rate of Hybrid Impatiens

Vargo

Faust

2022

hortte

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“…It was not accurately known as to the ideal level of soil acidity for Rafflesia, but the level of pH of 5.0-5.5 was perceived to be ideal for the plant's good growth performance. Bud growth was measured by its diameter (and circumference) as per Faust and Lewis (2005), using a measuring tape.…”

Section: Data Collectionmentioning

confidence: 99%

Modelling In-situ Factors Affecting Bud’s Growth of Rafflesia kerrii Meijer in Lojing Highlands, Kelantan, Peninsular Malaysia

Iman¹,

Hassin²,

Abas³

et al. 2021

JST

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Studies on the statistical approach to analyzing growth factors of bud’s growth in the genus Rafflesia have been lacking. This study quantified the effects of eight selected ecological factors hypothesized to be influencing bud’s growth (diameter and circumference) of Rafflesia kerrii Meijer. A non-experimental cross-sectional data collection was conducted between April and August 2018 by in-situ observation and measurements on eight ecological factors utilizing thirty-four sampled individual plants in Lojing Highlands, Kelantan, Peninsular Malaysia. The Ordinary Least Squares (OLS) and Heteroscedasticity-Consistent- Error (HCE) OLS regression models were employed to establish the statistical relationship between bud’s growth and its influencing factors. Host plant’s ecological ability, level of temperature, light shading, soil acidity, and interaction between plant survival condition and growth stage were found to be the significant and influential ecological factors to bud’s growth of Rafflesia kerrii. The results also showed that, model wise, HCE OLS models outperformed the OLS models in explaining the cause-and-effect relationship under study. Due to some limitations in sampling and data collection, further studies were recommended to corroborate this study using a larger sample covering a larger geographic area – possibly across different localities.

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“…Prolific flowering is a desirable market trait selected for by ornamental plant breeders; however, the presence of flowers on stock plants poses a cutting production challenge due to reductions in cutting yield (Faust and Lewis, 2005). Floral development on stock plants can be inhibited or delayed with the application of ethephon [(2-chloroethyl) phosphonic acid] (Latimer and Whipker, 2013).…”

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confidence: 99%

The Effect of Daily Light Integral, Ethephon, and Node Position of Impatiens ×hybrida Stock Plants on Flowering of the Harvested Unrooted Cuttings

Vargo¹,

Faust²

2021

horts

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Herbaceous stock plant production and cutting harvest methods affect the performance of cuttings harvested from those stock plants. Specifically, the effect of daily light integral (DLI), ethephon spray applications, and the stock plant node position (NPSP) of hybrid impatiens (Impatiens ×hybrida) ‘Compact Electric Orange’ stock plants on the flowering of the harvested cuttings was examined. The DLI treatments were grouped in ranges of low (5.1–5.5 mol·m–2·d–1), medium (7.6–8.8 mol·m–2·d–1), and high (10.3–12.0 mol·m–2·d–1) levels. The stock plants were treated weekly with 0, 50, 100, 200, or 300 mg·L–1 ethephon. Cuttings were harvested from six NPSP, which refers to the location on the stock plants from which the cuttings were harvested. Time to flower of the harvested cuttings decreased as DLI increased from 5.1 to 12.0 mol·m–2·d–1, as ethephon concentrations decreased from 300 to 0 mg·L–1, and as NPSP moved from lower to upper positions within the stock plant canopy. Time to flower was highly correlated with the node position on the cutting (NPC) where the first flower appeared. For example, when flowers appeared in the lowest NPC on the shoot (NPC 1), the first flower opened 2.5 weeks after sticking the unrooted cuttings in propagation, while flowers that appeared in NPC 7, the seventh-oldest node from the base of the cutting, opened at 9.0 weeks. The results demonstrate how stock plant management practices can be manipulated to produce cuttings that allow growers to produce flowering plants on different schedules, i.e., production time can be shortened from conventional production schedules, which may allow hybrid impatiens to be marketed like bedding plant species such as impatiens (Impatiens walleriana).

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(66) Modeling Flower Bud Development of Impatiens hawkeri and I. walleriana

Cited by 4 publications

References 0 publications

Modeling the Effect of Temperature on the Flower Development Rate of Hybrid Impatiens

Modeling the Effect of Temperature on the Flower Development Rate of Hybrid Impatiens

Modelling In-situ Factors Affecting Bud’s Growth of Rafflesia kerrii Meijer in Lojing Highlands, Kelantan, Peninsular Malaysia

The Effect of Daily Light Integral, Ethephon, and Node Position of Impatiens ×hybrida Stock Plants on Flowering of the Harvested Unrooted Cuttings

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