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GENETICS OF FIELD RESISTANCE AND TRANSGRESSIVE SEGREGATION TO LEAF RUST OF WHEAT (Triticum aestivum L. em. Thell)

B. Yadav, B. Ram, S.K. Sethi and O.P. Luthra
Cereal Research Communications
Vol. 20, No. 1/2 (1992), pp. 41-48
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/23784255
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
GENETICS OF FIELD RESISTANCE AND TRANSGRESSIVE SEGREGATION TO LEAF RUST OF WHEAT (Triticum aestivum L. em. Thell)
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Abstract

Genetics of field resistance to leaf rust of wheat was studied involving six generations, P1,P2,F1,F2, B1 (F1 × P1), B2 (F1 × P2) during 1985-86 and seven generations, P1, P2, F1, F2, F3, B1S (B1self) and B2S (B2 self) during 1986-87 of a cross HD 2009 × WH 147. Field resistance was found to be partially dominant; controlled by three, possible more genes. Generation mean analyses revealed that both additive and non-additive gene effects were important in the inheritance of field resistance. Additive component maintained similar magnitude, whereas relative magnitude of non-additive components were variable in differents years. The two wheat cultivars HD 2009 and WH 147 appeared to have different major and/or minor genes for field resistance. Leaf rust resistance genes, Lr 13 present in both the parents was found to be ineffective against the population of Indian races of leaf rust of wheat. Transgressive segregation for both field resistance and susceptibility were identified in the F2 population. Segregation in F3 progenies of transgressive segregants for field resistance and generation mean analyses indicated the importance of both additive and non-additive gene effects for the occurrence of transgressive segregants for yield resistance in the F2 population.

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