PJB-2020-342
DEVELOPMENT OF HIGH YIELDING AND STRIPE RUST RESISTANT TYPES OF BREAD WHEAT (TRITICUM AESTIVUM L.) UNDER NATURAL AND ARTIFICIAL INFESTATION OF STRIPE RUST
Saira Saleem
Abstract
Among various diseases, rust disease is a major problem that may cause significant yield losses especially in bread wheat (Triticum aestivum L.). Thirteen wheat lines (rust resistant and susceptible) were grown to develop the crosses using North Caroline mating II (NCM-II) design. After successful crossing the parental lines including the resultant crosses were sown in field using Randomized Complete Block Design (RCBD). Results showed that breeding material studies had genetic variability that could be utilized in developing rust resistant, high yielding wheat genotypes. The data for stripe rust resistant were recorded and it was found that lines 10120 and 10111 while the crosses 10120 × 10111, 10118 × 10117, 10121 × 9317, 10121 × 10111 and 10121 × 10117 had shown resistance under natural as well as artificial infestation of yellow rust. The line 10111 and tester 10117 had positive while significant effects for most of the investigated characters under both (natural and artificial) conditions for combining ability studies. Line 10121 showed maximum general combining ability (GCA) value for grain yield per plant. Crosses 10121 × 9317 and 10120 × 6039 showed positive and significant GCA effects for most of the characters. Crosses 10121 × 9317 and 10118 × 10117 had highest value for specific combining ability (SCA) effects for grain yield per plant under both natural and artificial disease condition of stripe rust. According to the GCA and SCA effects the parental lines 10111 and 10121 and the crosses like 10121 × 9317, 10120 × 10111 and 10120 × 6039 are the potential combiners (GCA and SCA) and would be valuable to be utilized for future breeding. Non-additive gene action was also observed in several characters under observation. Therefore these promising lines and crosses need further exploitation for better grain yield and stripe rust resistance in future breeding programs.
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