Adult Plant Resistance (APR) based on partial resistance is an important and effective way to combat yellow rust (Puccinia striiformis) in wheat production. The objective of current research was planned to evaluate the response of 436 wheat (Triticum aestivum) genotypes against yellow rust resistance under field conditions during 2020 main cropping season. Over locations, Partial resistance screening was evaluated through Final Rust Severity (FRS), Area under Disease Progress Curve (AUDPC), Coefficient of Infection (CI), Relative Area under Disease Progress Curve (rAUDPC) and field reaction have used for differentiating Adult plant resistances. Responses of four hundred thirty six genotypes, one hundred fourteen wheat lines were high adult plant resistance, fifty eight lines were found to be intermediate adult plant resistant and two hundred sixty four were low adult plant resistance over location. With rAUDPC values over location twenty seven were 1-10 shown resistant, eighty seven lines were 11-30 categorized as moderately susceptible and three hundred twenty two genotypes exhibited susceptible response against yellow rust with more than 31-100 rAUDPC value. High values above 31 prcent of rAUDPC showed greater severity of yellow rust on wheat genotypes while lower rAUDPC values indicated resistance to yellow rust. Fifty bread wheat genotypes that were selected based on overall agronomic performance (biomass, spike length, number of spikes/m 2 , tillering capacity, stalk strength or lodging resistance, shattering resistance and diseases resistance especially yellow rust and Septoria blotch. Three genotypes were EBW192345, EBW192346 and EBW192347 extraordinarily out performed evaluated materials phenotypically in terms of agronomic performance and diseases resistance over locations. The present study revealed that the lines were having enough diversity regarding slow rusting behavior and yellow rust resistance, ranging from immunity to partial resistant lines. Present research provided the resistant wheat lines to the breeders to incorporate in their breeding program against yellow rust.
Wheat is one of the most widely grown cereal crops globally. Most wheat production in Ethiopia comes from small holder farmers. It is the third most important cereal crop after teff (Eragrostis tef) and maize (Zea mays) in area coverage and production in Ethiopia. The pathogen causing stripe rust disease infects the green parts on the cereals and grasses. Infection can happen anytime from the one-leaf to plant maturity phase provided the host plants are still green. Screening of 38 wheat genotypes (Triticum spp) was made to identify resistant against yellow rust (Puccinia Striforma.fs.Tritici) at Kulumsa agricultural research center and Meraro station in 2015 cropping season in Ethiopia. The experiment was laid out in augmented (non-replicated) design. Each plot consisted of two rows of 1-m long with spacing of 0.20m between rows. The average coefficient of infection varied from 0 to 100. The disease was as high as 100 CI on the susceptible check Lackech. The field response of wheat lines on resistance wheat lines were zero. Wheat lines Denbi, Mangudo, Hetossa, DZ -04-118, Yerer, Meraro and bollo had the least average coefficient of infection and regarded as resistance and wheat lines LD-157, dashen, lackech, Kulkulu and kubsa had the highest average coefficient of infection and regarded as susceptible to yellow rust at field.
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