Inheritance data: an important aid to the citrus breeder for fruit internal quality improvement
Improvement of fruit quality is one of the main goals of citrus breeding programmes. However, because of the lack of information on inheritance of internal quality in citrus, the breeder faces a difficult task when planning crosses for breeding new cultivars. By quantifying the variation in a population, the breeder can study the relationships between the hybrids and parents and gain an understanding of how certain characteristics are inherited. The Agricultural Research Council's Institute for Tropical and Subtropical Crops Citrus Breeding programme has therefore started to accumulate inheritance data and incorporate them into the breeding programme, in order to progress by way of a more informed breeding strategy. A study was undertaken to investigate the variation in citrus mandarin fruit internal quality by measuring Brix %, acid percentage and the Brix:acid ratio. This was carried out for six mandarin families, where female parent 'Kiyomi' tangor was crossed with male parents 'Dancy', 'Hansen', 'Rishon', 'Roma', 'Shani' and 'Sunburst' mandarins. A significant level of variation was found between the families, while greater variation was found within the families than between the families. All the families had a higher Brix % and Brix:acid ratio than the female parent 'Kiyomi', while all the families showed a higher acid percentage than one of the parents. Results of this study showed that it is possible to improve fruit internal quality in citrus by using suitable breeding parents.
Combrink, N.K., Bijzet, Z., Sippel, A.D. and Booyse, M. (2016). Inheritance data: an important aid to the citrus breeder for fruit internal quality improvement. Acta Hortic. 1127, 171-178
conventional breeding, mandarins, inheritance, Brix, acid, Brix:acid ratio