Plant Growth Regulators Reduce Postproduction Leaf Yellowing of Potted Asiflorum Lilies

The postharvest quality of potted Asiflorum lily `Donau' (Lilium hybrid) was evaluated after plants were sprayed with 0, 50, 250, or 500 mg·L-1 (BA equivalent) of Promalin (GA4+7 to BA ratio was 1:1) or Accel (GA4+7 to BA ratio 1:10) and stored at 2 to 3 °C for 0, 10, or 20 days. As storage was prolonged, more leaves senesced once plants were removed for evaluation. Leaf senescence declined with increasing concentrations of either Promalin or Accel, but Promalin was more effective. Application of 250 mg·L-1 Promalin completely eliminated leaf senescence over the 20-day shelf-life evaluation period, irrespective of duration of cold storage. The treatments did not affect flower bud opening or plant height. Chemical names used: gibberellin (GA4+7); benzyladenine (BA).

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Plant Growth Regulators Reduce Postproduction Leaf Yellowing of Potted Asiflorum Lilies

HortScience ◽

10.21273/hortsci.33.6.1036 ◽

1998 ◽

Vol 33 (6) ◽

pp. 1036-1037 ◽

Cited By ~ 4

Author(s):

Keith A. Funnell ◽

Royal D. Heins

Keyword(s):

Plant Growth ◽

Leaf Senescence ◽

Growth Regulators ◽

Postharvest Quality ◽

Flower Bud ◽

Evaluation Period ◽

Life Evaluation ◽

Leaf Yellowing ◽

Bud Opening

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Gibberellin4+7, Benzyladenine, and Supplemental Light Improve Postharvest Leaf and Flower Quality of Cold-stored `Stargazer' Hybrid Lilies

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.123.4.563 ◽

1998 ◽

Vol 123 (4) ◽

pp. 563-568 ◽

Cited By ~ 22

Author(s):

Anil P. Ranwala ◽

William B. Miller

Keyword(s):

Cold Storage ◽

Storage Temperature ◽

Postharvest Quality ◽

Flower Longevity ◽

Flower Bud ◽

Leaf Injury ◽

Leaf Chlorosis ◽

Bud Opening ◽

Flower Quality

Experiments were conducted to evaluate storage temperature, storage irradiance and prestorage foliar sprays of gibberellin, cytokinin or both on postharvest quality of Oriental hybrid lilies (Lilium sp. `Stargazer'). Cold storage of puffy bud stage plants at 4, 7, or 10 °C in dark for 2 weeks induced leaf chlorosis within 4 days in a simulated consumer environment, and resulted in 60% leaf chlorosis and 40% leaf abscission by 20 days. Cold storage also reduced the duration to flower bud opening (days from the end of cold storage till the last flower bud opened), inflorescence and flower longevity, and increased flower bud abortion. Storage at 1 °C resulted in severe leaf injury and 100% bud abortion. Providing light up to 40 μmol·m-2·s-1 during cold storage at 4 °C significantly delayed leaf chlorosis and abscission and increased the duration of flower bud opening, inflorescence and flower longevity, and reduced bud abortion. Application of hormone sprays before cold storage affected leaf and flower quality. ProVide (100 mg·L-1 GA4+7) and Promalin (100 mg·L-1 each GA4+7 and benzyladenine (BA)) effectively prevented leaf chlorosis and abscission at 4 °C while ProGibb (100 mg·L-1 GA3) and ABG-3062 (100 mg·L-1 BA) did not. Accel (10 mg·L-1 GA4+7 and 100 mg·L-1 BA) showed intermediate effects on leaf chlorosis. Flower longevity was increased and bud abortion was prevented by all hormone formulations except ProGibb. The combination of light (40 μmol·m-2·s-1) and Promalin (100 mg·L-1 each GA4+7 and BA) completely prevented cold storage induced leaf chlorosis and abscission.

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Exogenous Applications of Benzyladenine and Gibberellic Acid Inhibit Lower-leaf Senescence of Geraniums during Propagation

HortScience ◽

10.21273/hortsci.48.11.1352 ◽

2013 ◽

Vol 48 (11) ◽

pp. 1352-1357 ◽

Cited By ~ 3

Author(s):

Christopher J. Currey ◽

Roberto G. Lopez ◽

Vijay K. Rapaka ◽

James E. Faust ◽

Erik S. Runkle

Keyword(s):

Plant Growth ◽

Gibberellic Acid ◽

Plant Growth Regulators ◽

Leaf Senescence ◽

Growth Regulators ◽

Storage Period ◽

Rooted Cuttings ◽

Leaf Yellowing ◽

Spray Applications

After postharvest shipping, the lower leaves of zonal geranium (Pelargonium ×hortorum) cuttings often turn chlorotic and necrotic during rooting in a propagation environment. Our objective was to quantify the efficacy of spray applications of the plant growth regulators (PGRs) benzyladenine (BA) and/or gibberellic acid (GA) at various stages in propagation to reduce lower-leaf senescence and evaluate effects on subsequent rooting. In Expt. 1, cuttings of ‘Patriot White’ geraniums were harvested and treated with BA (2.5 or 5.0 mg·L−1), BA + GA4+7 (2.5 or 5.0 mg·L−1 each), or GA3 (0.5 or 2.0 mg·L−1) either before or after a 2-day storage period simulating commercial shipping. Post-shipment application of all PGRs eliminated leaf yellowing compared with cuttings treated pre-shipment, but rooting was inhibited. In Expt. 2, the promotion of rooting from a rooting hormone preceding treatment with BA (1.25 to 5.0 mg·L−1), BA+GA4+7 (1.25 to 5.0 mg·L−1 each), or GA3 (0.25 to 2.0 mg·L−1) was evaluated on ‘Patriot White’ geranium cuttings after a 2-day simulated shipping. Applying rooting hormones increased the percentage of fully rooted cuttings treated with BA and/or GA from 16.4% to 51.8%. In Expt. 3, cuttings of different geranium cultivars from a commercial producer varied in susceptibility and suppression of leaf yellowing after BA + GA4+7 applications. We conclude that foliar applications of BA + GA4+7 can suppress lower-leaf senescence and rooting during propagation of some geranium cultivars, and the inhibition of rooting can be at least partially overcome with an application of rooting hormone.

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Postharvest Development of Leaf Yellowing in Cut Asiatic and Oriental Lilies

HortScience ◽

10.21273/hortsci.35.5.830c ◽

2000 ◽

Vol 35 (5) ◽

pp. 830C-830

Author(s):

Susan S. Han

Keyword(s):

Growth Regulators ◽

Cold Storage ◽

Growth Regulator ◽

Postharvest Quality ◽

Vase Life ◽

Practical Application ◽

Leaf Yellowing ◽

Alternative Means ◽

Pulsed Treatment

The development of postharvest leaf yellowing affects the quality of cut Oriental and Asiatic lilies. Without cold storage, lower leaves began to turn yellow ≈1 week after placing them in an interior environment. The development of leaf yellowing continued to progress upward until the vase life was over with >25% of the leaves chlorotic. Cold storage of cut lilies worsened this leaf disorder. The longer the duration of cold storage, the sooner the development of leaf yellowing and the higher the percentage of leaves that were chlorotic. Spraying leaves with a solution containing 25 mg·L-1 each of BA and GA4+7 significantly reduced cold-stored induced leaf yellowing in both Oriental and Asiatic lily. While the growth regulator treatment completely prevented leaf yellowing of cold-stored Asiatic lilies, its effectiveness in Oriental lilies diminished with the duration of cold storage. Timing of the growth regulator application was not critical, as there were no differences in leaf yellowing when the growth regulator solution was sprayed before or after the cold storage. The concentration of the growth regulators was inversely related to the development of leaf yellowing and concentrations <5 mg·L-1 each of BA and GA4+7 were not effective. Alternative means of applying the growth regulators were evaluated, including the addition of the growth regulators to the preservative solution or as a pulsed treatment. Both methods completely prevented leaf yellowing but also induced bud abortion. For practical application, spraying the growth regulator solution on the leaves prior to or after cold storage would significantly improve postharvest quality of the cut lilies.

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097 Growth Regulator Application Improves Postharvest Quality of Cut Lilies

HortScience ◽

10.21273/hortsci.35.3.405d ◽

2000 ◽

Vol 35 (3) ◽

pp. 405D-405

Author(s):

Susan S. Han

Keyword(s):

Growth Regulators ◽

Cold Storage ◽

Growth Regulator ◽

Postharvest Quality ◽

Vase Life ◽

Practical Application ◽

Bud Development ◽

Leaf Yellowing ◽

Oriental Lily

Effects of the duration of cold storage, as well as the concentrations, timing, and means of application of a growth regulator solution on the postharvest quality of cut Oriental and Asiatic lilies were evaluated. Without cold storage, lower leaves of Oriental lily `Stargazer' began to turn yellow ≈1 week after placing stem in an interior environment. The development of leaf yellowing continued to progress upward until the end of the vase life when there was an average of >25% chlorotic leaves. Cold storage worsened the leaf disorder. The longer the duration of cold storage, the earlier the development of leaf yellowing and the higher the percentage of leaves that were chlorotic. Spraying leaves with a solution containing 25 mg·L-1 each of BA and GA4+7 significantly reduced cold-storage-induced leaf yellowing and bud abortion in both Oriental and Asiatic lily. Concentration of the growth regulator solution was inversely related to the development of leaf yellowing. Timing of the growth regulator application was not critical, as there were no differences in leaf yellowing or bud development when the growth regulator solution was sprayed before or after the cold storage. Addition of the growth regulators to the preservative solution completely prevented leaf yellowing but also induced bud abortion. For practical application, spraying growth regulators prior to or after the cold storage would significantly improve the postharvest quality of cut lilies.

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Postharvest Quality of Cut Roses Following Electron-beam Irradiation

HortScience ◽

10.21273/hortsci.32.4.698 ◽

1997 ◽

Vol 32 (4) ◽

pp. 698-701 ◽

Cited By ~ 8

Author(s):

Ai-Yu Chang ◽

Richard J. Gladon ◽

Mark L. Gleason ◽

Sharon K. Parker ◽

Nancy H. Agnew ◽

...

Keyword(s):

Electron Beam ◽

Electron Beam Irradiation ◽

Postharvest Quality ◽

Beam Irradiation ◽

Flower Bud ◽

Injury Threshold ◽

Postharvest Life ◽

Bud Opening ◽

Fourth Experiment

Cut Rosa ×hybrida L. `Royalty' flowers were used to determine the efficacy of electron-beam irradiation for increasing postharvest quality and decreasing petal infection by Botrytis cinerea Pers. In an experiment for determining the injury threshold, roses received electron-beam irradiation of 0, 0.5, 1, 2, and 4 kGy. Irradiation dosages ≥1 kGy caused necrosis on petal tissue and decreased postharvest life at 20 °C. In a second experiment to evaluate postharvest quality, roses were irradiated at 0, 0.25, 0.5, 0.75, and 1 kGy. Dosages of 0.25 and 0.5 kGy slowed the rate of flower bud opening for 2 days but did not decrease postharvest quality when compared with nonirradiated roses. Roses that received irradiation dosages of 0.75 and 1 kGy showed unacceptable quality. In a third experiment, roses that had or had not been inoculated with B. cinerea were irradiated at 0, 0.25, 0.5, and 0.75 kGy. Irradiation did not control B. cinerea populations, and rose quality decreased as dosage increased. In a fourth experiment to determine the effect of irradiation on B. cinerea, conidia on water-agar plates exposed to dosages ≤1, 2, and 4 kGy germinated at rates of ≈90%, 33%, and 2%, respectively, within 24 h.

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Benzyladenine and Gibberellins Improve Postharvest Quality of Cut Asiatic and Oriental Lilies

HortScience ◽

10.21273/hortsci.36.4.741 ◽

2001 ◽

Vol 36 (4) ◽

pp. 741-745 ◽

Cited By ~ 8

Author(s):

Susan S. Han

Keyword(s):

Growth Regulators ◽

Cold Storage ◽

Postharvest Quality ◽

Vase Life ◽

Practical Applications ◽

Fluorescent Lamps ◽

Leaf Yellowing ◽

Flower Quality ◽

Pulsed Treatment

The effects of the duration of cold storage, as well as the concentration, timing, and means of application of a solution containing 25 mg·L-1 each of benzyladenine (BA) and gibberellins (GA4+7) on the postharvest quality of cut Asiatic and Oriental lilies (Lilium sp.) were evaluated. Depending on the cultivar, lower leaves began to turn yellow between 1 and 2 weeks after placing non-cold-stored stems in a 20 °C room illuminated 12 h·d-1 with 8 μmol·m-2·s-1 from cool-white fluorescent lamps. Leaf yellowing continued to progress upward until the end of the vase life. Cold storage (3.3 °C) worsened the leaf disorder, particularly, on the Oriental lily `Stargazer'. The longer the duration of cold storage, the earlier the development of leaf yellowing and the higher the percentage of leaves that were chlorotic. In addition, cold storage induced bud blasting, inhibited flowers from fully opening, and reduced the longevity and fresh weight of open flowers and the vase life of cut stems. Spraying leaves with a solution containing 25 mg·L-1 each of BA and GA4+7 significantly reduced cold-storage-induced leaf yellowing, bud blasting, and vase life of three of the four cultivars tested. The development of leaf yellowing declined with increasing concentration of BA+GA4+7. The susceptibility of `Stargazer' to cold-storage-induced leaf yellowing and bud blasting can be counteracted by a concentration of growth regulators higher than that which was effective for the other cultivars. Timing of the BA+GA4+7 application was not critical, as there were no differences in leaf yellowing or bud development when the solution was sprayed before or after the cold storage. Addition of BA+GA4+7 (0.5 or 2.5 mg·L-1 of each) to the preservative solution or a pulsed treatment in solutions containing 25 mg·L-1 each of BA and GA4+7 for 4 hours prevented leaf yellowing, but increased bud blasting. For practical applications, growth regulators can be sprayed prior to or after cold storage in order to improve the postharvest leaf and flower quality of cut lilies.

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Influence of Plant Growth Regulators on Postharvest Quality of Zantesdeschia and Preplant Treatment for Preventing Erwinia Infection

HortScience ◽

10.21273/hortsci.31.4.597d ◽

1996 ◽

Vol 31 (4) ◽

pp. 597d-597

Author(s):

Jeff S. Kuehny ◽

Wen Chy Chang ◽

Patricia Branch

Keyword(s):

Sodium Chloride ◽

Plant Growth ◽

Plant Growth Regulators ◽

Sodium Hypochlorite ◽

Growth Regulators ◽

Postharvest Quality ◽

Cut Flower ◽

Height Control ◽

Flower Production

Zantesdeschia has been grown for cut-flower production for many years, but more recently it has been grown as a containerized plant. Problems with height control and disease, however, have limited Zantesdeschia production in warmer climates. Our objectives were to evaluate paclobutrazol and uniconazole on control of plant growth of three Zantesdeschia species and evaluate four preplant treatments for preventing Erwinia infection on rhizomes. Paclobutrazol at 1 mg a.i. gave the best control of flower height, foliage height, and plant width. After 20 d in a postharvest chamber, plants drenched with paclobuturazol at 2 mg a.i. and uniconazole at 6 mg a.i. were still suitable plants, plants drenched at 3 and 4 mg a.i. paclobutrazol remained short, and plants drenched at 2 and 4 mg a.i.uniconazole became tall and weak, with flower stems breaking over. Rhizomes were dipped in dimethylbenzyl ammonium chlorides, sodium hypochlorite, 4% formaldehyde, or streptomycin. Streptomycin provided the best control against Erwinia infection followed by formaldehyde. Dimethylbenzyl ammonium chlorides and sodium chloride provided the poorest protection.

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