This may be attributed to the occurrence of subsequent recombination (out crossing) between cultivars of different species or such cultivars might arise by somatic mutation of the wild and indigenous cultivars of these different species of the genus citrus
Krueger, the genus Citrus
includes at least 16 species, with hundreds of distant relatives, including lesser-known, peelable oddities like pummelos, trifoliate oranges, and kumquats.
Jacquin) (Sapindales: Rutaceae) and species and varieties of the genus Citrus
(Sapindales: Rutaceae) (Halbert & Manjunath 2004; Teck et al.
The genus Citrus
of the family Rutaceae which includes Indian wild orange (Citrus indica), Melanesian papeda (Citrus macroptera), bitter orange (Citrus aurantium), shaddock (Citrus grandis), Mandarin orange (Citrus reticulata), sweet orange (Citrus sinensis), lemon (Citrus limon) and grapefruit (Citrus paradise) are distributed throughout the tropical and temperate regions and are widely consumed as fresh fruits .
The systematics and taxonomy of the genus Citrus are complex and as many of species are hybrids of different species from two different genera the exact number of natural species is not clear yet.
is considered to be close relative to the genus Citrus as compared to the Poncirus spp (Xiao-Ming et al.
9 rootstocks belonging to the genus Citrus
and one [trifoliate orange (Poncirus trifoliate)] is from Poncirus (Table I).
citri vector lives on all species of the genus Citrus
and can be detected on other species of the family Rutaceae (Halbert & Manjunah 2004).
Currently two commonly classifications of Citrus are used, the Swingle system (Swingle and Reece, 1967) who recognized 16 species in the genus Citrus
and Tanaka system (Tanaka, 1977), which recognizes 162 species in the genus Citrus
Citrus, belonging to the genus Citrus
of the family Rutaceae, is the most widely produced fruit tree, and it is grown in more than 80 countries (Ladaniya, 2008).