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María Serrano, Ma Concepción Martínez-Madrid, and Félix Romojaro

Treatment of cut `Master' carnations (Dianthus caryophyllus L.) with 50 mm aminotriazole (ATA) in distilled water for 5 days retarded senescence, increased flower longevity by 4 days compared to the control carnations kept in distilled water and inhibited the climacteric peak of ethylene production normally produced during the senescence of these flowers. The treatment had no effect, however, on the levels of the polyamines putrescine and spermidine. Thus, the biosynthetic routes of ethylene and polyamines may not compete for the common precursor S-adenosylmethionine (SAM). Also, in the petals of the control carnations, increased ethylene production was correlated with increased ion leakage and abscisic acid (ABA) levels. In the ATA treated petals, ion leakage and ABA levels increased later and reached values less than 50% compared to the control carnations. Chemical names used: abscisic acid (ABA), 3-1H-amino-1,2,4-triazole-1-yl (aminotriazole), 1-aminocyclopropane-1-carboxylic acid (ACC), S-adenosyl methionine (SAM).

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P. Tonutti, P. Casson, and A. Ramina

Abbreviations: AFB, after full bloom; DW, dry weight; EFE, ethylene-forming; enzyme; FW, fresh weight. Research supported by CNR, Italy. Special grant RAISA. Authorized for publication as paper no. 259 of the scientific journal series of the Inst

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Mustafa Özgen, Sookhee Park, and Jiwan P. Palta

Mitigation of ethylene promoted leaf senescence by lysophosphatidylethanolamine (LPE) was studied. Micropropagated `Russet Burbank' potato (Solanum tuberosum L.,) plantlets were grown on MS media in sterile culture tubes. After 2 weeks of growth, tubes were sealed and ethylene gas was applied to obtain 5 nL·L–1 final concentration in the culture tubes. Observations and measurements were taken two weeks after ethylene injection. Potato plantlets treated with ethylene showed severe leaf senescence symptoms such as epinasty, lack of growth, yellowing and axillary shoot formation. These observations indicate that apical dominance has been lost with ethylene treatment. The same experiment was repeated with different concentrations of LPE in the MS medium. Inclusion of 50 or 100 mg·L–1 of LPE in the medium mitigated the damage normally caused by applied ethylene. Leaves of plantlets exposed simultaneously to LPE and ethylene had significantly higher chlorophyll content and more healthy leaves compared to plantlets grown on medium lacking LPE. Results of this study suggest that LPE may have the potential to retard ethylene-promoted leaf senescence and may mitigate ethylene induced loss in apical dominance of micropropagated potato plantlets.

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Christopher B. Cerveny and William B. Miller

development and storage before cooling, ethylene can cause a number of physiological and morphological disorders, including gummosis (excretion of polysaccharides), flower bud abortion, shortened leaves or flowers, reduced or eliminated roots, deformed anthers

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Shiow Y. Wang and Miklos Faust

Abbreviations: ACC, 1-aminocyclopropane-l-carboxylic acid; AdoMet, S-adenosylmethionine; DTE, dithioerythritol; EFE, ethylene-forming enzyme; FID-GC, flame ionization detector-gas chromatography; MACC, l-(malonylamino) cyclopropane-1-carboxylic acid

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Ekaterina Papadopoulou and Rebecca Grumet

We thank Randy Beaudry and David Dilley for providing use of gas chromatography equipment and advice for the ethylene measurements and Amy Iezzoni and Randy Beaudry for helpful reviews of the manuscript. This project was in part supported by

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R. Porat, B. Weiss, I. Zipori, and A. Dag

). According to their respiratory patterns and ethylene production rates during ripening, fruit and vegetables are classified into two major groups, known as “climacteric” and “nonclimacteric” ( Baile, 1964 ). Climacteric fruit are those whose ripening process

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Greg McCollum and Pilar Maul

Grapefruit ( Citrus paradisi ), like all citrus fruits, produce very low levels of ethylene throughout development and do not exhibit an ethylene climacteric during ripening ( Aharoni, 1968 ; Eaks, 1970 ). Citrus fruit do exhibit elevated levels

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Lina Mayuoni and Ron Porat

fruit all year round, but natural color break occurs only during the winter when temperatures drop below 12.8 °C, which elicits a small peak in ethylene evolution ( Cooper et al., 1969 ; Young and Erickson, 1961 ). However, during the summer and autumn

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Mengmeng Gu, James A. Robbins, and Curt R. Rom

(unpublished data). Ethylene biosynthesis may be stimulated under various environmental stresses, including water-deficit stress ( Morgan and Drew, 1997 ). An increase in ethylene production during water-deficit stress may play a role in a plant's acclimation