| It is well established that verieties C 306 and NP 401 carry strong allele(s)
of Ne1 gene (GILL et al. 1969; ANAND et al.
1969; CHOWDHURY 1982), therefore, rest of the varieties involved in hybrid
combinations namely P48-B, P1206 and Raj 1482 are supposed to be the carrier
of strong allele(s) of Ne2 gene, thereby giving severe
hybrid necrosis. There were some more crosses in our hybridization programme, where also we observed necrotic hybrid plants. Variety C 281 reported to be the carrier of Ne1 gene (ANAND et al.1969) produced some necrotic hybrid plants and some normal plants when crossed with P48-B, P1206, HD 2009 and K 227 while with Raj 1482, a Ne2 carrier, all the hybrid plants were normal. Similarly, Narbada-4 variety when crossed with P48-B and Raj 1482, the Ne2 carriers, produced some necrotic and some normal plants while with P1206, also a Ne2 carrier, no necrotic hybrid plant was produced. So the varieties C 281 and Narbada-4 posses both Ne1 and ne1 genes in their genotypes and thus are not homogeneous for Ne1. Some of the plants of these varieties carry Ne1 and others are non-carrier. Similar results were reproted by ANAND et al.(1969). The varieties, which are supposed to be the carrier of Ne2 gene had Mexican germ plasm and other varieties, the carrier of Ne1 gene were of Indian origin. Thus, these findings support the view of ZEVEN (1966) on geographical distribution of Ne1 and Ne2 genes. Based on these observations, varieties possessing/not possessing Ne1 and Ne2 genes have been listed in Table 2. These informations will be of importance to the wheat breeders/geneticists in their hybridization programmes. References ANAND, S.C., GILL, B.S. & R.P. JAIN 1969. Necrosis in intervarietal crosses of wheat. Indian J. Genet., 29 (1): 131-134. CHOWDHURY, R.K. 1982. Hybrid necrosis in wheat. WIS, 53: 47. GILL, K.S., D.R. VASUDEVA, B.S. GHAI & M.L. GUPTA 1969. Necrosis in hybrids of Punjab variety of 306 and Mexican varieties of wheat. P.A.U.J. Res., 6: 10-14. GILL, KHEM SINGH, GHAI BACHITAR SINGH & GUPTA, MADAN LAL, 1972. Genetic and developmental analysis of hybrid necrosis in wheat. Indian J. Genet., 32: 12-17. HERMSEN, J.G. Th. 1963. Hybrid necrosis as a problem for wheat breeder. Euphytica, 12: 1-16. NARULA, P.N., S. SINGH & P.S.L. SRIVASTAVA 1966. Hybrid necrosis in bread wheat. Curr. Sci., 35: 547-549. ZEVEN, A.C. 1966. Geographical distribution of genes causing hybrid necrosis in wheat. Euphytica, 15: 281-284. |
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