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Simona Pinnavaia, Emilio Senesi, Anne Plotto, Jan A. Narciso, and Elizabeth A. Baldwin

Citrus fruit, particularly oranges, are traditionally known to be high in vitamin C and are now promoted as healthy and rich in antioxidants ( Florida Department of Citrus, 2006 ). However, because the peel must be removed for consumption, this

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Ed Stover, William Castle, and Chih-Cheng T. Chao

The world market for citrus (Citrus spp.) products has undergone dramatic shifts over the last decade. These shifts are influencing development and planting of new citrus cultivars. Seedlessness and very easy peeling have become paramount in mandarin types (C. reticulata and hybrids), and new cultivars are being developed through plant breeding and selection of new sports. In both sweet orange (C. sinensis) and grapefruit (C. paradisi), essentially all important cultivars are derived from a single original hybrid of each fruit type, and plant improvement has focused on selection of sports with redder color and extended maturity. The existence of many active citrus breeding programs makes it likely that we will continue to see evolution of new citrus cultivars over the foreseeable future.

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Jinhe Bai, Elizabeth Baldwin, Jack Hearn, Randy Driggers, and Ed Stover

For orange juice (OJ) use, although sugars and acids are essential for good taste, it is the volatiles that in fact determine the unique flavor of a cultivar ( Shaw, 1991 ). The hybrids between mandarin and sweet orange and their descendants

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Amalie B. Kurzer, Rose Bechtel, and Jean-Xavier Guinard

]. Oranges were most of the fresh market citrus produced in California, followed in descending order by the categories of lemons ( Citrus limon ), tangerines ( Citrus reticulata ) and mandarins, and finally grapefruit ( Citrus paradisi ). Although lower than

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Safwan Shiyab

important ( Ali et al., 2000 ). A species of multiple use, the sour orange ( Citrus aurantium L.) is also known as bitter or seville orange. It is a universal rootstock for citrus and is used widely in the Mediterranean region ( Navarro et al., 1975 ) It is

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Kelly T. Morgan, T.A. Obreza, and J.M.S. Scholberg

density (FRLD) ranged from 0.53 cm·cm −3 for Swingle citrumelo to 2.02 cm·cm −3 for trifoliate orange ( P. trifoliata ) ( Eissenstat, 1991 ). Fibrous root dry weight density in the 0- to 0.3-m soil depth increased from 450 to 1000 g·m −3 between trees

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Araceli M. Vera-Guzman, Maria T. Lafuente, Emmanuel Aispuro-Hernandez, Irasema Vargas-Arispuro, and Miguel A. Martinez-Tellez

and Zacarías, 2006 ). CI develops during fruit storage at temperatures ranging between 1 and 12 °C, depending on the citrus cultivar, whereas NCPP develops at higher temperatures. Sweet oranges from the Navel group are prone to develop NCPP, whereas

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Min Zhang, Xiuxin Deng, Changping Qin, Chunli Chen, Hongyan Zhang, Qing Liu, Zhiyong Hu, Linlin Guo, Wenhua Song, Yong Tan, and Shengcai Liao

‘Hongjiangcheng’ ( C. sinensis + C. reticulata ) ( Shen et al., 1998 ). An intergeneric grafting chimera named ‘Zhihelu’ [ C. reticulata + Poncirus trifoliate (L.) Raf.] between ‘Ponkan’ ( C. reticulata ) and trifoliate orange ( P. trifoliate ) was found in

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Lisa Tang, Shweta Chhajed, and Tripti Vashisth

). A report released by the U.S. Department of Agriculture ( USDA, 2018 ) indicated a dramatic increase in the estimated preharvest drop rate for ‘Valencia’ sweet orange from 14% during the 2009–10 production season to 30% during the 2016–17 season

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Said A. Hamido, Kelly T. Morgan, Robert C. Ebel, and Davie M. Kadyampakeni

schedules The experiment was conducted from 1 Jan. 2014 to 27 Aug. 2015 on 12-year-old sweet orange [ Citrus × sinensis (L.) Osbeck] trees located in three commercial groves: 1) Arcadia, FL (27.22°N, 81.86°W) in a valkaria fine sandy soil (Siliceous