Citrus Genetics, Breeding and Biotechnology by Iqrar Khan

By Iqrar Khan

This multi-authored ebook presents a entire overview of citrus breeding, together with appropriate genetics, molecular biology and biotechnology. themes mentioned contain beginning and taxonomy, hybridization and spot tactics, triploid breeding, mutation breeding, choice for fruit characteristics, tree characters and affliction resistant, rootstock breeding, soil version, nucellar embryony, cytogenetics, mapping, gene cloning, chromosome move know-how, haploidy, stream cytometry and somaclonal variation.

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Swingle (1943) first mentioned the possibility of using glycosides as a taxonomic marker, in addition to classical morphological characters. e. , 1986). Taxonomic studies received a boost from the work of Barrett and Rhodes in 1976: ‘A numerical taxonomic study of affinity relationships in cultivated Citrus and its close relatives’. Barrett and Rhodes performed a comprehensive phylogenetic study that evaluated 146 morphological and biochemical tree, leaf, flower and fruit characteristics. This study suggested that only three citrus types, namely the citron, Citrus medica, the mandarin, Citrus reticulata, and the pummelo, Citrus grandis (now called C.

Maxima. Also, the results obtained by Federici et al. (1998) indicate that C. macrophylla is closely related to C. micrantha. The sweet lime C. limettioides (Palestine sweet lime) was considered by Webber (1943) to be a hybrid of the Mexican lime with a sweet lemon or a sweet citron. Barrett and Rhodes agreed on the involvement of the Mexican lime as a parent, but they thought that a sweet orange rather than a lemon or citron was involved. , 2000) which indicates that the Palestine sweet lime might be a backcross hybrid between sweet orange and citron.

According to Tolkowsky, these authors are mistaken: in fact, some branches with citron and lemon fruits can be seen in a mosaic in a Roman villa at Carthage (2nd century AD). Calabrese (1998) adds some more pictorial and musive depictions to those of Tolkowsky, such as the mosaics of the Villa del Casale di Piazza Armerina in Sicily and the Pompeian fresco of the Casa del Frutteto in Pompei and of the National Museum of Naples, and states that the lemon was well known by the Romans since the imperial period, although there are no literary references to this species.

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