SciELO - Scientific Electronic Library Online

vol.27 número2A rapid alternative technique for obtaining silver-positive patterns in chromosomesSelection and genetic gains for juvenile traits in progenies of Hevea in São Paulo State, Brazil índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados


Genetics and Molecular Biology

versión impresa ISSN 1415-4757versión On-line ISSN 1678-4685


BORDIGNON, Rita; MEDINA-FILHO, Herculano Penna; SIQUEIRA, Walter José  y  TEOFILO SOBRINHO, Joaquim. The genetics of tolerance to tristeza disease in citrus rootstocks. Genet. Mol. Biol. [online]. 2004, vol.27, n.2, pp.199-206. ISSN 1415-4757.

Controlled pollinations between four elite citrus rootstocks, Citrus limonia - 'Limeira' rangpur lime (Cravo), C. sunki - 'Sunki' mandarin (Sunki), C. aurantium - 'São Paulo' sour orange (Azeda) and Poncirus trifoliata - 'Davis A' trifoliate orange (Trifoliata), resulted in 1614 nucelar and 1938 hybrid plants identified by the isozyme loci Pgi-1, Pgm-1, Got-1, Got-2, Aps-1, Me-1, Prxa-1 and or by the morphological markers broadness of leaf petiole wing or trifoliolate leaves. Tolerance to the citrus tristeza virus (CTV) was evaluated under nursery and field conditions for several years by the reaction of Valencia orange infected with a severe strain of CTV and grafted onto the hybrids and nucellar clones. Genetic analyses indicated that tolerance was controlled by at least two loci designated here as Az and t interacting in dominant-recessive epistasis. Genotypes Az__ __ __ and __ __ tt were tolerant while azaz T__ was intolerant. The intolerant Azeda was azaz TT, the tolerant rootstocks Sunki and Cravo were Azaz tt and the Trifoliata was Azaz TT. The different degrees of intolerance seen in some hybrids may reflect the inability of segregating modifiers from parental clones to overcome the epistatic interaction that controls the major tolerance reaction.

Palabras clave : Citrus; CTV; epistasis; rootstock; tristeza.

        · texto en Inglés     · Inglés ( pdf epdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons