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Inheritance of field reaction to brown rust and other characters in crosses of Triticum aestivum



Inheritance of field reaction to brown rust and other characters in crosses of Triticum aestivum



Indian J Genet Plant Breeding 23(3): 264-274



The mode of inheritance of field reaction to brown rust, certain other characters and linkage relationship between different characters have been reported and discussed. Field resistance to brown rust of E. 871 in crosses with N.P. 165, N.P. 718 and Pb.C. 281 was found to be controlled by 2 recessive genes. Narrowness of the leaf along with thin, weak stem was observed to be conditioned by 2 recessive genes in the crosses, E. 957XPb.C. 518 and Pb.C. 273X N.P. 790. Leaf-tip drying was found to be a monogenically controlled dominant character in the cross E. 957 X Pb.C. 518. Waxy bloom character behaved as a monogenic dominant in the crosses E. 871 X N. P. 165 and E. 871 X N. P. 718. Ear alignment, studied in the cross E. 871X Pb.C. 281, was found to be controlled by a single factor pair with partial dominance of erect ear. Studies on awn arrangment in the cross Frontiera (E. 957) X Pb.C. 518 indicated adpressed-semi-adpressed condition to be inherited on a monogenic basis, with the dominance of deciduous nature in the cross E. 957 X Pb.C. 518. Grain texture and grain lustre, studied in the crosses E. 871 X N.P. 165, E. 871 X N.P. 718 and E. 871X Pb.C. 281, were found to be governed by an incompletely dominant factor pair. No simple factorial explanation could be given for the inheritance of grain-brush in the crosses E. 871 XN. P. 165 and E. 871 X Pb.C 281; it is likely that this is controlled by multiple factors. Black rust reaction was not found associated with any of the morphological characters studied. Linkage was observed between glume shoulder and rachis pigmentation in the crosses Pb.C. 273X N.P. 790 and Pb.C. 518XN. P. 790. Absolute linkage was observed between grain texture and grain lustre, and between awning and glume beak shape.

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