| YASHVIR & KESAVAN (1979) also observed a low transmission rate. The frequency
of monosomic addition plants in the progeny of double monosomic was only
8.4 percent. They could not recover monosomic addition palnts in the progeny
of double monosomic addition lines. According to them, this is due to addition
decay. MATSUMURA (1952) produced three of the possible seven addition disomics from crosses of T. spelta and T. polonicum. Only one of them could be maintained without difficulty. The other two had low fertility, and one of them also had poor endosperm. JOPPA & MCNEAL (1972) could produce disomic addition lincs in 1D, 2D, 3D, 4D, 5D and 7D. They were male sterile either partially or completely. In the present study also, the fertility of haplosomic lincs was reduced either partially or completely. The cause or causes of low fertility in the D-genome addition lincs is unknown. Sterility in aneuploids such as trisomics has been attributed to chromosome imbalance. Differences in the genetic content of the A and B genomcs of Pb C 591 may also contribute to the sterility encountered. The extracted tetraploids of KERBER (1964) and KALTSIKES et al. (1968) were generally weak and low in fertility, thus demonstrating a lack of fitness for survival at the tetraploid level. Literature Cited ALSTON, F.W. & JONES. 1968. Variation in the transmission of univalent chromosomes from pentaploid wheat hybrids. Can. J. Genet. Cylol., 10: 908-912. BHAT, S.R. & J.V. GOUD. 1979. Monosomic analysis of some morphological characters in wheat Triticum aestivum L. em. Thell. Wheat Inf. Serv. 50: 14-18. BHATIA, C. R., H. PERSCHKHE and H. AXMANN 1977. Amino acid composition of the ditelosomics of Chinese Spring wheat. Cereal Res. Commun. 5 : 19-28. JOPPA, L.R., J.A. BIETZ & E. MCDONALD. 1975. Development and characteristics of disomic 1D addition lines of durum wheat. Can. J. Genet. Cytol. 17: 355-363. KERBER, E.R. 1964. Wheat : reconstitution of the tetraploid component (AABB) of hexaploids. Science. 143 : 253-255. KALTSIKES, P.J., L.E. EVANS & E.N. LARTER. 1968. Identification of chromosome segment controlling bread making quality in common wheat. Can. J. Genet. Cytol. 10: 763. MATSUMURA, S. 1952. Chromosome analysis of Dinkel genome in off-spring of a pentaploid hybrid. III. 29-chromosome D haplosomics and their relation to nullisomics. Cytologia. 17: 35- 49. MATIERN, P.J., R. MORRIS, J.W. SCHMIDT & R.F. MUMM. 1979. Protein and lysine composition of Chinese Spring ditelosomics. Proc. 5th Int. Wheat Genet. Symp. IARI. New Delhi. pp. 486-494. OPEKE, L.K. 1961. Ph. D. Thesis Reading University. SADANANDA, A.R., M.S. KURUVINASHETTI & J.V. GOUD. 1977. Location of genes governing kernel protein and tyrosinase activity in 'Sharabati Sonora' wheat. Indian J . Agric. Sci. 47: 508-510. YASHVIR & P.C. KESAVAN. 1979. Transformation and cytological behaviour of monosomic addition lines of D-genome in Triticum durum Desf. Proc. 5th Int. Genet. Symp. IARI. New Delhi, pp. 349-352. |
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