| STALDER (1929) observed that no chlorophyll deficient mutations are obtained in
hexaploid wheat. He therefore suggested that there are more genes which regulate
chlorophyll synthesis in hexaploid wheat. SEARS (1954), on the basis of aneuploid analysis,
suggested that group 3 chromosomes control the synthesis of chlorophyll in hexaploid wheat. To facilitate genetical studies in detail, on the system of chlorophyll synthesis in wheat, the following gene symbols are being proposed:- For A genome, CSG3A (chlorophyll synthetic gene on chromosome 3A) ; for B genome, CSG3B (chlorophyll synthetic gene on chromosome 3B) and for D genome, CSG3D (chlorophyll synthetic gene on chromosome 3D). Identification of only one chromosome (3A) in wheat variety Pb. C 591 explains as to why albina plants are obtained after mutagenic treatment in this variety and not in others (NATARAJAN et al., 1958). Literature Cited NATARAJAN, A.T., S.M. SIKKA and M.S. SWAMINATHAN 1958. Polyploidy, radiosensitivity and mutation frequency in wheats. Proc. 2nd Int. Conf. Peaceful Uses of Atomic Energy, Geneva, 27: 321-331. SAWHNEY, R.N., B.C. JOSHI and D. SINGH 1978. Genetics of resistance in the wheat cultivar Chhoti Lerma against stem rust race 122. Euphytica, 27: 461-464. SEARS, E.R. 1954. The aneuploids of common wheat. Research Bull., 571, Univ. of Missouri. pp. 1-58. STADLER, L.J. 1929. Chromosome number and mutation rate in Avena and Triticum. Proc. nat. Acad. Sci., U.S.A. 15: 876-881. SWAMINATHAN, M.S., V.L., CHOPRA B.C. JOSHI and D. SINGH 1968. Development of monosomic series in an Indian wheat and isolation of nullisomic lines. Wheat Inf. Serv., 27: 19-20. |
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