Abstract
Leaf rust is a major disease of wheat crop in the world as a whole. This study was undertaken to find the genetic effects of adult plant leaf resistance in wheat (Triticum aestivum L.). Three wheat crosses were developed from three resistant and one susceptible parent. Six populations (P1, P2, F1, F2, BC1 and BC2) of each cross were grown under field conditions and were artificially inoculated with isolates of mixture of leaf rust prevalent races. Leaf rust intensity and reaction type were observed and the coefficient of infection was computed. Generation means and variance analyses were performed for the estimation of additive, dominance and epistatic genetic effects. Additive and dominance, as well as epistatic genetic effects, are involved in the inheritance of leaf rust resistance. However, the narrow sense heritability estimates were low, which also exhibited the presence of epistatic genetic effects. Thus, selection of resistant adult plant in later segregating generations would be useful for the development of high yielding wheat genotypes. Key words: Wheat, leaf rust, Puccinia recondite, genetic studies, Pakistan.
Highlights
The disease leaf rust caused by Puccinia recondita f. sp. tritici has been reported to be a serious disease of wheat in the world (Sayre et al, 1998)
Anderson and Kempthorne (1954), Cockerham (1954) and Hayman and Mather (1955) proposed the genetic models that permitted the estimation of additive, dominance and epistatic effects, whereas Robinson and Comstock (1955) observed that additive genetic variation is greater in those attributes with a less complex inheritance
The analysis of variance revealed high significant differences (P
Summary
The disease leaf rust caused by Puccinia recondita f. sp. tritici has been reported to be a serious disease of wheat in the world (Sayre et al, 1998). Chemical control of the disease adds to the cost of production, whereas the development of resistant wheat varieties is effective in controlling the disease. Some genes confer disease resistance to plant both at seedling and adult stages, wheat varieties with adult plant resistance to disease are considered more important than those of seedling resistance (Simons, 1975). The individual gene effects for disease resistance cannot be measured, in that the genes must be considered en masse and the statistical procedures may be used to obtain basic genetic information. Hayman (1958) described the estimation of the additive, dominance, additive x additive, additive x dominance and dominance x dominance gene effects. The generation means analysis described by Mather and Jinks (1982) is relatively an easy technique to estimate the components of genetic
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