| The observations made on these necrotic F1 hybrids showed
that the yellowing of leaves started at 2-3 leaf stage and most of the hybrids
died at the 5-6 leaf stage without producing ear, showing the characteristic
of severe necrosis of grade 7 as described by Hermsen (1963). It is well established that Indian variety C306 carries Ne1 gene. Therefore, the varieties like IWP72, WH331, UP262, P48B, Raj 939, CBS289, Cm 58803, Cm 59376, Cm 66675, CBS102, PC89, WL410, Kalyansona, which have produced necrotic hybrids with C306, carry Ne2 gene. Similarly, the variety GP104 which did give normal plants with C306 but showed necrosis with above listed varieties, must have Ne1 gene. Other varieties like GP106, WH157 and API05 also gave indication of having Ne1 gene in their genotypic back-ground. The crosses involving WH331 showed less necrosis, indicating that this variety may be having m or w allele of Ne2 but it needs further confirmation. There were varieties like WH157, IWP72 and WL410 which were earlier reported to be non-carrier of necrotic genes, have now been identified having Ne1 (WH157) and Ne2 (WL410 and IWP72) genes. These information will be of importance to the wheat breeders/ geneticists in their hybridization programme. References Anand SC, Gill BS & Jain RP 1969. Necrosis in intervarietal crosses of wheat. Indian J Genet 29(1): 131-134. Chowdhury RK 1981. Hybrid necrosis in Wheat Inf Serv 53: 40-42 Chowdhury RK 1983. Hybrid necrosis in Wheat Inf Serv 57: 9-11 Dhaliwal HS, Sharma SK and Randhawa AS 1986. How to overcome hybrid necrosis in wheat. Wheat Inf Serv, 61/62: 27-28. Gill KS, Vasudeva DR, Ghai BS & Gupta ML 1969. Necrosis in hybrids of Punjab variety C306 and Mexican varieties of wheat. PAU J. Res 6: 8-13 Hermsen JGTh 1963. Hybrid necrosis as a problem for wheat breeder. Euphytica, 12: 1-16 |
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