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Trials with citrandarins as rootstock for the Pêra and Valencia sweet oranges and the Tahiti acid lime


Currently, most Brazilian citrus plants are on only two rootstocks, Swingle citrumelo and Rangpur lime, which, consequently, may put at risk the citrus industry. The use of other rootstocks such as Poncirus trifoliata and some its hybrids is limited, due to the occurrence of incompatibility between selections of this rootstock and Pêra sweet orange and its susceptibility to drought. Therefore, citrandarins, hybrids of Sunki mandarins with Poncirus trifoliata, constitute a new generation of rootstocks, and may be an alternative to increase the number of rootstocks that can be grafted with Pêra sweet orange, allowing the formation of productive plants and longevity with high quality fruits. The Agronomic Institute (IAC), through Sylvio Moreira Citriculture Center, has been responsible for the selection and improvement (through the production of nucellar clones and premunization against Citrus tristeza virus, CTV) of most of the cultivars used in Brazilian citriculture.To reach this goal, researchers are constantly evaluating the accesses contained in the active germplasm bank of Citrus, started in 1928, and has been expanded with germplasm introduced from other states and from abroad and currently has about 2,000 accesses.Since the 1990s, the IAC has also been carrying out a program of genetic improvement of citrus via controlled crosses. Populations of hybrids obtained from crosses between several citrus varieties, selected by molecular markers, were established in several regions of the state of São Paulo, constituting an experimental network of new genotypes. From these experiments, hybrids with great potential to be used as rootstocks were selected.In view of the above, the present proposal has as main objective, the evaluation of varieties and hybrids (citrandarins) of citrus rootstocks for resistance to drought, compatibility between canopy and rootstocks, vegetative development, production and physical-chemical quality in different soil and climatic conditions and planting spacing, such as rootstocks for the Pêra and Valência sweet oranges and the Tahiti acid lime, in competition trials with commercial varieties, aiming at the final evaluation for the launching of new varieties of rootstocks for the citricultura.All pre-selected varieties and hybrids are results of previous projects and this proposal aims at the continuity of the citrus rootstock breeding program that has been supported by FAPESP, CNPq and INCT. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SORATTO, TATIANY APARECIDA TEIXEIRA; CURTOLO, MAIARA; MARENGO, SAMANTA; DEZOTTI, ANA LUCIA; LIMA, ROMULO PEDRO MACEDO; GAZAFFI, RODRIGO; MACHADO, MARCOS ANTONIO; CRISTOFANI-YALY, MARIANGELA. QTL and eQTL mapping associated with host response toCandidatusLiberibacter asiaticus in citrandarins. TROPICAL PLANT PATHOLOGY, v. 45, n. 6, SI, . (16/22133-0, 14/50880-0, 11/18605-0, 18/00133-4)
PETRY, FABIANE C.; DE NADAI, FABIO B.; CRISTOFANI-YALY, MARIANGELA; LATADO, RODRIGO R.; MERCADANTE, ADRIANA Z.. Carotenoid biosynthesis and quality characteristics of new hybrids between tangor (Citrus reticulata x C. sinensis) cv. `Murcott' and sweet orange (C. sinensis) cv. `Pera'. Food Research International, v. 122, p. 461-470, . (13/07914-8, 17/08648-0, 13/09804-5, 18/23752-1, 14/50880-0, 18/00133-4, 11/18605-0)

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