Tree and fruit characters of Citrus triploids from tetraploid by diploid crosses
AuthorsRobert K. Soost
James W. Cameron
Authors AffiliationsRobert K. Soost was Professor of Genetics and Geneticist in the Agricultural Experiment Station, University of California, Riverside; James W. Cameron was Professor of Horticultural Science and Geneticist in the Agricultural Experiment Station, University of California, Riverside.
Hilgardia 39(20):569-579. DOI:10.3733/hilg.v39n20p569. July 1969.
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Tree and fruit characters of citrus triploids from six crosses involving tetraploid grapefruit and tetraploid lemon as seed parents, and five diploid varieties as pollen parents, are described. A high percentage of the triploids have maintained good vigor but only about one-third have yielded well. Seed numbers typically have been low. Percentages of total soluble solids were generally intermediate as compared with the parents. Percentage of acid was usually high, being strongly influenced by the tetraploid parents. Leaf thickness and shape were usually intermediate, but sometimes approached the tetraploid parents. A few of the triploids have fruit and tree characteristics desired in a satisfactory variety, but, partly because of their high acidity, none has been released.
Bacchi O. Observacoes citologicas em citrus. I. Numero de cromosomios de algumas especies e variedades. Jorn. de Agron., Piracicaba. 1940. 3:249-58.
Cameron J. W., Frost H. B. Genetics, breeding and nucellar embryony. Chap. 5. The Citrus Industry. 1968. II:rev. ed. Berkeley: Univ. of California, Division of Agric. Sciences.
Cameron J. W., Soost R. K. Characters of new populations of Citrus polyploids, and the relation between tetraploidy in the pollen parent and hybrid tetraploid progeny. Proc. First Intern. Citrus Symposium. 1969. 1:199-205. March, 1968. Vol
Frost H. B. Tetraploidy in Citrus. Proc. Nat. Acad. Sci. 1925. 11:535-37. DOI: 10.1073/pnas.11.9.535 [CrossRef]
Frost H. B. Polyembryony, heterozygosis and chimeras in citrus. Hilgardia. 1926. 1(16):365-402. DOI: 10.3733/hilg.v01n16p365 [CrossRef]
Frost H. B. Genetics and Breeding. Chap. IX in: The Citrus Industry, Vol. I. 1943. Berkeley: Univ. of California Press.
Furusato K. Abnormal growth of citrus trees caused by deviating chromosome numbers in the grafting stocks. Ann. Rept. Nat’l Inst. Genetics, Japan. 1953. 3:52-53.
Krug C. A. Chromosome numbers in the subfamily Aurantioideae with special reference to the genus Citrus. Bot. Gaz. 1943. 104:602-11. DOI: 10.1086/335173 [CrossRef]
Krug C. A., Bacchi O. Triploid varieties of citrus. Jour. Heredity. 1943. 34:277-83.
Lapin W. K. Investigations on polyploidy in citrus. U.S.S.R. All-Union Sci. Res. Inst. Humid Subtropics Works. 1937. 1(4):1-68.
Longley A. E. Polycary, polyspory and polyploidy in citrus and citrus relatives. Wash. Acad. Sci. Jour. 1925. 15:347-51.
Longley A. E. Triploid citrus. Wash. Acad. Sci. Jour. 1926. 16:543-45.
Mukherjee S. K., Cameron J. W. Tree size and chromosome number in a trial of tetraploid trifoliate orange as a citrus rootstock. Proc. Amer. Soc. Hort. Sci. 1958. 72:267-72.
Nakamura M. Cytological studies in the genus Citrus. III. Further data on the chromosome numbers. 1942. 13: Japan, Tokyo: Jour. Hort. Assoc. p. 30-40.
Russo F., Torrisi M. Problemi e abiettivi di genetica agrumaria. Parte I. Selezione degli ibridi, degli embrioni nucellari, dei triploidi e provocazione artificiale de mutazioni. Ann. della Speri. Agraria Roma. 1953. 7(1):883-906.
Soost R. K., Cameron J. W. Contrasting effects of acid and nonacid pummelos on the acidity of hybrid citrus progenies. Hilgardia. 1961. 30(12):351-57. DOI: 10.3733/hilg.v30n12p351 [CrossRef]
Tachikawa T., Tanaka Y., Hara S. Investigations on the breeding of Citrus trees. I. Study on the breeding of triploid Citrus varieties. Bull. Shizuoka Citrus Expt. Sta. 1961. 4:33-44.