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Rayane Barcelos Bisi, Ute Albrecht, and Kim D. Bowman

challenges is to obtain enough plants of the new rootstock clones in nursery propagation. Although propagation of citrus rootstocks can be accomplished effectively by stem cuttings or micropropagation ( Albrecht et al., 2017 ; Bowman and Albrecht, 2017

Open access

Madhurababu Kunta, Sandy Chavez, Zenaida Viloria, Hilda S. del Rio, Madhavi Devanaboina, George Yanev, Jong-Won Park, and Eliezer S. Louzada

grow in the LRGV; four citrus rootstocks including sour orange rootstock were subjected to high concentrations of P. nicotianae inoculation. Materials and Methods Plant material. Four citrus rootstocks were screened for P. nicotianae tolerance

Free access

Pedro Gonzalez, James P. Syvertsen, and Ed Etxeberria

Although citrus trees are considered relatively salt-sensitive, there are inherent differences in Na + and Cl – tolerance among the many commercial citrus rootstocks ( Castle et al., 2006 ; Maas, 1993 ). Salinity tolerance of citrus rootstocks is

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Lina Fu, Lijun Chai, Dekuan Ding, Zhiyong Pan, and Shu’ang Peng

rootstock, ‘Zhique’, in calcareous soil conditions. ‘Zhique’ is a local citrus rootstock native to Chenggu county of Shaanxi province, China. In the same orchard with calcareous soil, ‘Miyagawa Wase’ Satsuma mandarin grafted on ‘Zhique’ displayed normal

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Kim D. Bowman, Lynn Faulkner, and Mike Kesinger

traits. In consequence, rootstock is now regarded as an even more critical component of successful citrus production in the presence of HLB ( Giles and Rusnak, 2015 ). ‘US-802’, ‘US-812’, ‘US-897’, and ‘US-942’ are hybrid citrus rootstocks released by the

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Sawyer N. Adams, Walter O. Ac-Pangan, and Lorenzo Rossi

soil salinity increases. Considering the impact of HLB on the citrus industry, it is important to investigate how salt stress can be mitigated and managed. Materials and Methods Establishment Sixty 3-month-old ‘US-942’ citrus rootstock seedlings were

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Juan Carlos Melgar, Arnold W. Schumann, and James P. Syvertsen

, NJ Sorgona, A. Abenavoli, M.R. Gringeri, P.G. Cacco, G. 2006 A comparison of nitrogen use efficiency definitions in Citrus rootstocks Sci. Hort. 109 389 393 Sultan, S

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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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William S. Castle

Florida citrus plant improvement team, here is an historical perspective on citrus rootstocks along with some observations and reflections on the human or social side of research and grower cooperation. It is well established from decades of experience

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John D. Lea-Cox and James P. Syvertsen

The objectives of this greenhouse study were to determine the rate of nitrogen (N) uptake over a 30 day period, use efficiency and N partitioning within two citrus rootstock species. Sixteen-week old seedlings of Cleopatra mandarin (C. reticulata Blanco) and Swingle citrumelo (C. paradisi × P. trifoliata) were assigned to treatments (harvest day × rootstock species) in a completely randomized design, grown in a Candler fine sand for 6 weeks and fertilized weekly with a N:P:K (5:1:5) plus minor elements solution at 200 mg N · liter-1. A single application of 15NH4 15NO3 (20% 15N) was substituted for a normal weekly fertigation. Six replicate plants of each rootstock species were harvested at ½, 1½, 3½, 7½, 10½ and 30 days after I5N application. Uptake of 15N was more rapid in SC over the first 7½ days (17% of applied) than in CM (11%), but uptake over 30 days was similar (52-53%) for both species. A higher proportion of 15N was found in the photosynthetic tissues of CM (74%) than in SC (48%), whereas a lower proportion was found in the fibrous roots of CM (9%) than SC (22%).