The Effects of Ethephon on Cutting Yield of 23 Selected Annual Cultivars

Faust, James E.; Lewis, Kelly P.

doi:10.17660/actahortic.2005.683.14

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Application of ethephon results in the abscission of flower buds and flowers, likely as a result of ethylene-mediated promotion of abscisic acid (ABA) synthesis (Goren et al, 1993;Hansen and Grossmann, 2000;Klee, 2002) and sub-sequent cellulase and polygalacturonase activity (Mishra et al, 2008), thus reducing sink tissue carbohydrate demands. Ethylenerelated inhibition of indole-3-acetic acid (IAA) synthesis (Chadwick and Burg, 1970;Weber and Osborn, 1969) is a likely cause of increased branching in both young liners and stock plants (Faust and Lewis, 2005;Hayashi et al, 2001) treated with ethephon.…”

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confidence: 99%

Ethephon Residual Catalysis on Unrooted Impatiens hawkeri Cuttings and Stock Plants

Leatherwood¹,

Dole²,

Faust³

2009

horts

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Ethephon [(2-chloroethyl) phosphonic acid] is used to increase stock plant cutting productivity through increased flower and flower bud abscission and branching. However, ethylene evolution resulting from ethephon application is suspected to cause leaf abscission of unrooted cuttings during shipping. It was the objective of this study to assess ethylene evolution from ethephon-treated cuttings during storage and shipping of unrooted cuttings. Impatiens hawkeri W. Bull ‘Sonic Red’ and ‘Sonic White’ stock plants were treated with 0, 250, 500, or 1000 mg·L−1 ethephon. Cuttings were harvested from 1 to 21 days later and each harvest was stored at 20 °C in sealed jars for 24 h before ethylene measurement. Higher ethephon doses resulted in greater ethylene generation. Cuttings harvested 1 day after treatment with 0, 250, 500, or 1000 mg·L−1 ethephon evolved 0.07, 1.3, 1.7, or 5.8 μL·L−1·g−1 (fresh weight) ethylene in the first 24 h of storage at 20 °C, respectively. Twenty-one days after treatment, cuttings from the same plants evolved 0.05, 0.05, 0.15, or 0.14 μL·L−1·g−1 (fresh weight) ethylene in the first 24 h of storage at 20 °C, respectively. As cuttings were harvested from Day 1 to Day 21, ethylene concentrations evolved within the first 24 h of storage decreased exponentially. Rinsing cuttings, treated 24 h earlier with 500 mg·L−1 ethephon, by gently agitating for 10 s in deionized water reduced ethylene evolution to 0.7 μL·L−1·g−1 (fresh weight) as compared with 1.7 for unrinsed cuttings. Cuttings harvested 24 h after treatment with 500 mg·L−1 ethephon stored at 10, 15, 20, and 25 °C for 24 h evolved 0.37, 0.81, 2.03, and 3.55 μL·L−1·g−1 (fresh weight) ethylene. The resulting mean temperature coefficient (Q10) for the 10 to 25 °C range from all replications was 5.15 ± 0.85. Thus, ethylene continues to evolve from ethephon-treated Impatiens hawkeri stock plants for up to 21 days and can accumulate to high concentrations during cutting storage.