Diurnal carbohydrate dynamics affect postharvest ethylene responsiveness in portulaca (Portulaca grandiflora ‘Yubi Deep Rose’) unrooted cuttings

Rapaka, Vijaya Kumar; Faust, James E.; Dole, John M.; Runkle, Erik S.

doi:10.1016/j.postharvbio.2006.12.004

Cited by 25 publications

(15 citation statements)

References 25 publications

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“…Por outro lado, estacas muito tenras podem apresentar baixo enraizamento em virtude da multiplicação das células rizogênicas dependerem, entre outros fatores, da biossíntese de proteínas e ácidos nucléicos (Fachinello et al, 1995). Esse processo só é possível quando existe disponibilidade de energia e carbono estrutural para formação de novas células (Rapaka et al, 2007). Pacheco & Franco (2008), objetivando avaliar o efeito do AIB e do diâmetro da estaca de Luehea divaricata, concluíram que a maior sobrevivência, enraizamento, número e comprimento radicial foi encontrado em estacas médias e grossas, imersas em 5.000 mg L -1 de solução hidroalcoólica de AIB.…”

Section: Estaquia De Espécies Nativasunclassified

Estaquia e miniestaquia de espécies florestais lenhosas do Brasil

Dias¹,

Oliveira²,

Xavier³

et al. 2012

Pesq. Flor. Bras.

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Section: Estaquia De Espécies Nativasunclassified

Estaquia e miniestaquia de espécies florestais lenhosas do Brasil

Dias¹,

Oliveira²,

Xavier³

et al. 2012

Pesq. Flor. Bras.

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“…In shipping, problems may occur when cuttings of ethylene-sensitive species are packed alongside ethephon-treated cuttings. Species susceptible to ethylene concentrations as low as 0.1 mLÁL -1 such as Lantana camera L. or Portulaca oleracea L. (Leatherwood, 2008;Rapaka et al, 2007) could suffer leaf abscission when packaged alongside cuttings still releasing ethylene. Safe ethylene concentrations for all herbaceous cuttings are not yet known.…”

Section: Discussionmentioning

confidence: 99%

Ethephon Residual Catalysis on Unrooted Impatiens hawkeri Cuttings and Stock Plants

Leatherwood¹,

Dole²,

Faust³

2009

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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.

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“…is well known to be sensitive to endogenous and exogenous ethylene, which causes rapid flower wilting and senescence (Whitehead et al, 1984;Serek et al, 1995). Leaf abscission occurs on portulaca (Portulaca oleracea L.) when exposed to exogenous ethylene (Rapaka et al, 2007). With cuphea (Cuphea hyssopifolia Kunth), exogenous ethylene results in flower abscission (Leatherwood and Mattson, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…A number of factors influence ethylene sensitivity of plants including temperature (Maxie et al, 1973), carbohydrate status (Rapaka et al, 2007(Rapaka et al, , 2008, and the use of anti-ethylene agents (Blankenship and Dole, 2003;Serek and Reid, 1993). However, to our knowledge, no studies have been reported on plant growth retardant (PGR) effect on ethylene sensitivity of ornamental potted and nursery plants.…”

Section: Introductionmentioning

confidence: 99%