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Yuan Yu, Chunxian Chen, Ming Huang, Qibin Yu, Dongliang Du, Matthew R. Mattia, and Frederick G. Gmitter Jr.

), sour orange, grapefruit ( C. paradisi ), lemon ( Citrus limon ), and lime, generally, are propagated vegetatively and many come true to type from seed, thereby limiting further interspecific recombination and resulting in minimal intragroup genetic

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Dafna Langgut

resulted in the formation of the sour orange most probably took place in southern China or northern Indo-china ( Weisskopf and Fuller, 2013 ). Based on the detailed textual survey conducted by Ramón-Laca (2003) , it seems that the sour orange was

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William S. Castle, James C. Baldwin, Ronald P. Muraro, and Ramon Littell

consecutive seasons when the trees were 16 and 17 years old. Samples of 400 kg of fruit were differentially harvested in March by combining fruit from four replicates of trees on Carrizo citrange, Cleopatra mandarin, rough lemon, sour orange, or Swingle

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Madhurababu Kunta, J.V. da Graça, and Mani Skaria

-old, viroid-free Valencia orange trees on Cleopatra mandarin, rough lemon, and sour orange rootstocks generally grew faster and yielded more compared with trees infected with exocortis and cachexia ( Olson and Shull, 1962 ). Also, inoculation of Star Ruby

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Shahrzad Bodaghi, Gabriel Pugina, Bo Meyering, Kim D. Bowman, and Ute Albrecht

.4 (9 mai), 26.3 (15 mai), and 24.7 (21 mai) (data not shown, see Bodaghi et al., 2022 ). Significant differences among rootstock cultivars were observed at 15 mai, when sour orange roots had the lowest Ct-value (31.0) and therefore highest level of

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Vicente Gimeno, James P. Syvertsen, Inma Simon, Vicente Martinez, Jose M. Camara-Zapata, Manuel Nieves, and Francisco Garcia-Sanchez

-flooded ‘Verna’ lemon (VL) trees grafted on ‘Sourorange (SO) rootstock either without an interstock (VL/SO) or interstocked with ‘Valencia’ orange (VL/V/SO) or with ‘Castellano’ orange (VL/C/SO). Bars represent means ± se (n = 6). *, **, and *** indicate

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

potential cultivars ( Fig. 1 ). All these hybrids are derived at least ½ from sweet orange and include varying amounts of additional mandarin (not through sweet orange), grapefruit, P. trifoliata, and sour orange ( C. ×aurantium L.) in their pedigrees

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William S. Castle, James C. Baldwin, and Ronald P. Muraro

25 rootstocks were planted 4.3 × 6.7 m in Sept. 1986 in a randomized complete block design of east–west rows with six replicates of three-tree, in-row plots. Bittersweet sour orange ( C. aurantium L.), sour orange, Palestine sweet lime ( C

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Jude W. Grosser, Frederick G. Gmitter Jr., J.L. Chandler, and Eliezer S. Louzada

Protoplasm culture following polyethylene glycol-induced fusion resulted in the regeneration of tetraploid somatic hybrid plants from the following attempted parental combinations: Cleopatra mandarin (Citrus reticulata Blanco) + Argentine trifoliate orange [Poncirus trifoliata (L.) Raf.]; `Succari' sweet orange [C. sinensis (L.) Osb.] + Argentine trifoliate orange; sour orange (C. aurantium L.) + Flying Dragon trifoliate orange (P. trifolita); sour orange + Rangpur (C. limonia Osb.); and Milam lemon (purported sexual hybrid of C. jambhiri Lush × C. sinensis) + Sun Chu Sha mandarin (C. reticulate Blanco). Protoplasm isolation, fusion, and culture were conducted according to previously published methods. Regenerated plants were classified according to leaf morphology, chromosome number, and peroxidase, phosphoglucomutase, and phosphoglucose isomerase leaf isozyme profiles. All of the somatic hybrid plants were tetraploid, as expected (2n = 4x = 36), and all five selections have been propagated and entered into commercial citrus rootstock trials.

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Suzanne M.D. Rogers, Kalyani Dias, and David Byrne

Viral damage is a major problem in citrus. As most citrus are asexually propagated, it is necessary to have an alternative way of regenerating virus-free plants from infected plants. Shoot apicies are the most suitable explant material for this purpose because that part of the plant is virus-free. Fifty sour orange shoot tips and 22 Swingle shoot tips, 1 mm - 1.5 mm long, were excised from in vitro germinated seedlings and cultured on semisolid Murashige and Skoog medium, without growth regulators, containing 0.2 % Gelrite. After 8-10 weeks, shoots and leaves developed in 68'% of the sour orange explants, and in 77% of the Swingle explants. Some explants produced roots, after 11-12 weeks, and could be removed from culture and established in soil medium.