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Zhi-Rong Li, Kang-Di Hu, Fen-Qin Zhang, Shi-Ping Li, Lan-Ying Hu, Yan-Hong Li, Song-Hua Wang, and Hua Zhang

transcriptional levels, involving decline in photosynthesis and degradation of macromolecules such as proteins, lipids, and chlorophyll ( Buchanan-Wollaston, 1997 ; Smart, 1994 ). Production of ethylene plays an important role in regulating the yellowing of

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Warley M. Nascimento, Jairo V. Vieira, Giovani O. Silva, Kathleen R. Reitsma, and Daniel J. Cantliffe

thermodormancy in unaged but not in aged lettuce seeds. Seed aging can lead to some physiological and biochemical changes such as reduced ethylene and endo-β-mannanase activity and thus lead to thermoinhibition in germination, as observed in lettuce seeds

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William B. Miller, Neil S. Mattson, Xiaorong Xie, Danghui Xu, Christopher J. Currey, Kasey L. Clemens, Roberto G. Lopez, Michael Olrich, and Erik S. Runkle

., 1988 ; Rademacher, 2000 ). In contrast, ethephon [(2-chloroethyl) phosphonic acid] is a PGR that releases ethylene (C 2 H 4 ), chlorine (Cl – ), and hydrogen phosphate (H 2 PO 4 − ) on application and is known to inhibit internode elongation, induce

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Kevin Laskowski and Emily Merewitz

that treatments that inhibit ethylene improved annual bluegrass recovery following low temperature and ice conditions; and ethylene-promotive treatments reduced or had no effect on winter recovery, depending on the duration ( Laskowski and Merewitz

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Karthik-Joseph John-Karuppiah and Jacqueline K. Burns

plants, including citrus ( Citrus spp.) ( Greenberg et al., 1975 ; Ratner et al., 1969 ). Ethylene is a plant hormone that plays a major role in regulating the abscission process ( Bleecker and Patterson, 1997 ; Burg, 1968 ; Jackson and Osborne, 1970

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Steven J. McArtney, John D. Obermiller, Tom Hoyt, and Michael L. Parker

respiration and aroma production and softening of the apple flesh, are triggered by the autocatalytic rise in ethylene production ( Schaffer et al., 2007 ) that defines a climacteric fruit. Currently, the fruit maturation process can be managed in commercial

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Yunqing Zhu, Wenfang Zeng, Xiaobei Wang, Lei Pan, Liang Niu, Zhenhua Lu, Guochao Cui, and Zhiqiang Wang

auxin accumulation and ethylene production during the ripening process, resulting in rapid softening and a short shelf life, whereas SH fruit sustains low levels of auxin accumulation and ethylene production and barely softens on the tree or after

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Mason T. MacDonald, Rajasekaran R. Lada, Martine Dorais, and Steeve Pepin

( Chastagner and Riley, 2003 ; MacDonald and Lada, 2008 ). As a result, there has been more interest in understanding the physiology of needle abscission in postharvest balsam fir. Although several factors have been considered, the role of ethylene has

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Sylvia M. Blankenship and Edward C. Sisler

Scatchard plots for ethylene binding in apples (Malus domestica Borkh.), which were harvested weekly for 5 weeks to include the ethylene climacteric rise, showed C50 values (concentration of ethylene needed to occupy 50% of the ethylene binding sites) of 0.10, 0.11, 0.34, 0.40, and 0.57 μl ethylene/liter-1, respectively, for each of the 5 weeks. Higher ethylene concentrations were required to saturate the binding sites during the climacteric rise than at other times. Diffusion of 14C-ethylene from the binding sites was curvilinear and did not show any indication of multiple binding sites. Ethylene was not metabolized by apple tissue.

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David G. Clark, Christopher Dervinis, James E. Barrett, and Terril A. Nell

Florida Agricultural Experiment Station journal series R-07081. Use of a seedling hypocotyl elongation assay as a genetic screen for ethylene sensitivity of seedling geranium cultivars. The cost of publishing this paper was defrayed in part