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GrainGenes Reference Report: IBB-1-549

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Reference
IBB-1-549
Title
Genetics of leaf rust and agronomic traits in wheat ( Triticum aestivum L.)
Journal
International Journal of Biology and Biotechnology
Year
2004
Volume
1
Pages
549-561
Author
Hussain F
Ashraf M
Mehdi SS
Ahmad MT
Abstract
Gene action for plant height, number of tillers per plant, number of grains per spike, 100-grain weight, grain yield per plant, biological yield per plant, harvest index and leaf rust [ Puccinia recondita f.sp. tritici ] incidence was studied in 8x8 diallel crosses, produced from susceptible and resistant wheat cultivars (SA 42, LU 26, MH 97, Nacozari F 76, Chenab 7, Crow, Parula and Inqilab 91), grown in Faisalabad, Pakistan. Highly significant additive and dominance effects with directional dominance effects, asymmetrical gene distribution, and important role of specific genes were recorded for all the traits except harvest index, in which directional dominance effects were absent. Maternal and reciprocal effects were not significant. Plant height and leaf rust incidence were controlled by additive genes with partial dominance, whereas harvest index was controlled by complete dominance. The overdominance gene action was predominant in the other traits. Simple gene action and the absence of non-allelic gene interaction were recorded for all traits. The greatest incidence of dominant genes was observed in Crow for number of grains per spike, grain yield, biological yield, harvest index and leaf rust incidence; LU 26 for plant height and grain weight; 97 for number of tillers; Parula for grain yield; and MH 97, Nacozari and Inqilab 91 for leaf rust incidence. The highest number of recessive genes was evident in Chenab 70 and SA 42 for grain yield, biological yield, harvest index and leaf rust incidence. The superior crosses consisted of MH 97 x Crow for number of tillers (11.97), SA 42 x Parula for grain number (60.1), LU 26 x Nacozari for grain weight (5.58 g), and MH 97 x LU 26 for grain yield (24.67 g). The following crosses with the lowest values of area under disease progress curve were resistant to leaf rust: LU 26 x Crow, LU 26 x Parula, LU 26 x Inqilab 91, SA 42 x Crow and MH 97 x Crow. Hence, Crow, Parula and Inqilab 91 could be successfully exploited as a source of leaf rust resistance for wheat breeding programmes
Keyword
agricultural research
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