| As early as 1962, KIHARA & TSUNEWAKI observed low seed fertility in monosomic
plants of durum wheat and normal seed fertility in trisomic plant. NORONHA-WAGNER;
& MELLO- SAMPAYO (1966) observed that the vigour and fertility of monosomics
and trisomics was below normal. MOCHIZUKI (1968) also observed poor seed
setting in monosomic lines of durum wheat. MOCHIZUKI (1970) observed
poorly developed embryos and endosperms in all monosomic lines of durum
wheat, because of which the seeds were shrivelled and germination percentage
as well as viability of seeds was very less, NISHIKAWA (1971) also reported
that the seeds of telosoimic plants of tetraploid wheat were shrivelled.
As in case of second back cross generation, in third back cross generation also, seed germination increased. In BC2 generation, plants with 13"+1' alone were selected and back crossed to Bijaga Yellow. As there is a very low transmission frequency of monomiomic condition, even from female side also, in durum wheat, female gamete contributes 14 chromosomes which gets fertilized with Bijaga Yellow pollen (n=14). There will be perfect 14" formation in them, because of this reason high germination of crossed seeds was observed in BC3. These germinated seeds were mostly disomics i.e. plants with 14" (98.32 percent) and only 1.68 percent were observed to be monosomic plants. Literature Cited BOYES, J.W. and THOMPSON, W.P. 1937. J. Genet. 34, 203-227. BOZZINI, A. and GIORGI, B. 1971: Theor. Appl. Genet. 41, 67-74. KIHARA, H. 1968. Proc. 3rd Int. Wheat Genet. Symp. 125-134. KIHARA, H. and TSUNEWAKI, K. 1962. What Inf. Serv. 14, 1-3. MOCHIZUKI, A. 1968. Proc. 3rd Int. Wheat Genet. Symp. 310-315. MOCHIZUKI, A. 1970. Seiken Ziho. 22, 39-49 NISHIKAWA, K. 1971. Seiken Ziho. 22, 51-55. NORONHA-WAGNER, M. and MELLO-Sampayo, T. 1966. Proc. 2nd Int. Wheat Genet. Symp. Hereditas (suppl.), 2, 382-392. PISSAREV, V. 1966. Proc. 2nd Int. Wheat Genet. Symp. Hereditas (suppl.) 2, 279-290. SEARS, E.R. 1954. Missouri Agrio. Expt. Stn. Res. Bull. 572, 1-52. STEBBINS, G.L. 1958. Adv. Genet. 9, 147-215. SUEMOTO, H. 1968. Proc. 3rd Int. Wheat Genet. Symp. 14-152. THOMPSON, W.P. and HOLLINGSHEAD, L. 1927. J. Genetics. 17, 283-307. WATERHOUSE, W.L. 1933. Proc. Linn. Soc. N.S. Wales, 58, 99-104. WATERHOUSE, W.L. 1952. Proc. Linn. Soc. N.S. Wales, 77, 331-336. WATKINS, A.E. 1927. J. Genet. 18, 395-396 |
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