Abstract
The search for new citrus rootstocks with better performance than those currently used is the major aim of the citrus industry in many countries. New diseases, the spread of known diseases, and citrus culture under different environmental conditions force the demand for new rootstocks. Carrizo citrange [Citrus sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.], the most used rootstock in Spain, frequently shows iron chlorosis and salinity problems. Other less common rootstocks, such as Cleopatra mandarin (C. reshniHort. ex Tan.), C. volkameriana Ten. & Pasq., Swingle citrumelo (C. paradisi Macf. x P. trifoliata), and C. macrophylla Wester, do not conveniently solve the problems. Forner-Alcaide 5 (F-A 5) and Forner-Alcaide 13 (F-A 13) are two interspecific hybrids obtained through traditional hybridization by the senior author in a program for breeding citrus rootstocks at the Instituto Valenciano de Investigaciones Agrarias (IVIA) in Moncada (Valencia), Spain. The goals of the breeding program were to obtain new rootstocks tolerant to CTV, salinity, and lime-induced chlorosis and resistant to Phytophthora sp. (Forner and Alcaide, 1993, 1994; Forner et al., 1997).
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