Abstract
Chromosome counts have been done in 12 species of Trifolium, closely related to T. alexandrinum L., and the chiasma frequency in meiosis, pollen fertility, and seedset upon selfing was estimated. In all species, the basic number of chromosomes was 2n=16 arranged in eight bivalents. Two species, T. salmoneum Mout, and T. berytheum Boiss., have 0–7 B-chromosomes in eight out of nine plants examined. The frequency of B-chromosomes was somewhat correlated with pollen fertility. Chiasma frequency ranged between 10.8 and 16.1 per cell with specific and ecotypic differentiation. Except for T. alexandrinum, the species analyzed were completely (or, in a few cases, highly) self-incompatible.
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Almeida, J. L. F., Carvalho, H. P.: Trevos autotetraploides. III. O caso de Trifolium alexandrinum L. Agrononia Lusit. 24, 45–78 (1962).
Battaglia, E.: Cytogenetics of B-chromosomes. Caryologia (Firenze) 17, 245–299 (1964).
Britten, E. J.: Chromosome numbers in the genus Trifolium. Cytologia (Tokyo) 28, 428–449 (1963).
Darlington, C. D.: The evolution of genetic systems. Cambridge: Cambridge Univ. Press 1939.
—: Chromosome botany, 2nd ed. London: Allen and Unwin 1963.
—, La Cour, L. F.: The handling of chromosomes, 3rd ed. London: Allen and Unwin 1965.
Metha, R.K., Suramanyam, K.N., Swaminathan, M.S.: Studies on induced polyploids in forage crops. III. Growth, cytological behaviour and seed fertility of C1, C2 and C3 cultures of berseem. Ind. J. Genet. Pl. Breed 23 (1), 67–81 (1963).
Müntzing, A.: Accessory chromosomes. Trans. Bose Res. Inst. 22, 1–15 (1958).
Oppenheimer, H. R.: The origin of Egyptian clover, with critical revision of some closely related species. Bull. Res. Coun. Israel 70, 202–221 (1959).
Pritchard, A. J.: Chromosome numbers in some species of Trifolium. Aust. J. agric. Res. 20, 883–887 (1969).
Wexelsen, H.: Chromosome numbers and morphology in Trifolium. Univ. Calif. Publ. Agric. Sci. 2, 355–376 (1928).
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Contribution from the Volcani Institute of Agricultural Research, Bet Dagan, Israel. 1970 Series, No. 1677 E. This research was financed by a grant from the U.S.D.A. under P.L. 480, Contract A10-CR-56.
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Putiievsky, E., Katznelson, J. Chromosome number and genetic system in several Trifolium species related to T. alexandrinum . Chromosoma 30, 476–482 (1970). https://doi.org/10.1007/BF00321142
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DOI: https://doi.org/10.1007/BF00321142