Browsing by Author "Abera, Netsanet"

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    Determining the Heterotic Group of the Nineteen Open Pollinated Maize Varieties Based on the Performance of Their Topcrosses with Inbreed Lines Testers in Uganda
    (Journal of Scientific Research and Reports, 2018) Abera, Netsanet; Odong, Thomas; Kasozi, Richard
    The study was conducted to determine the heterotic group of the 19 OPVs using the specific combining ability effects of their test crosses in terms of grain yield generated from L x T mating design and evaluated in 4 agro ecologies of Uganda using 5x13 α-lattice design replicated twice per location. The results of this experiment indicated the presence of low variability for grain yield and thus the possibility of selection among the topcross hybrids that are adapted to the different agro ecologies of Uganda is low. An OPV parent was assigned to group A when its cross with inbred line tester A showed a large negative SCA value otherwise it was assigned to group B and those parents with their lower magnitude of SCA were assigned as AB heterotic group. Based on this criterion, 3 parent OPVs (Longe 4, Longe 5RS and SUWAN) were assigned to the heterotic group A, 2 (SITUKA MI and Ambsyn5) were assigned to heterotic group B, and other 14 OPVs that showed similar performance and lower SCA value than the SE when crossed with tester A or tester B were assigned to both heterotic group AB. The expressed heterosis between female OPV Ambsyn5 and SITUKA MI when test crosses with in bred line tester A (CML536) and Longe 4, Longe 5RS and SUWAN with another tester B (CML202) including OPV KC2014 which was with positive GCA could be exploited to produce topcrosses.
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    Phenotypic Diversity and Correlation Coefficient Analysis of Open Pollinated Maize Varieties in Uganda
    (Global Journal of Agricultural Research, 2021) Abera, Netsanet; Odong, Thomas; Kasozi, Lwanga Charles
    Maize (Zea mays L.) is among the most important cereal crops grown and consumed in East Africa. Improved open pollinated maize varieties prevail popular among resource-poor farmers due to their low cost of production. Despite the advantages of OPVs in Uganda current trends show that open pollinated varieties are being continuously replaced by hybrids, and maize production is constrained by foliar diseases and abiotic (drought) factors. Therefore, it has become important to broaden the genetic pool of OPVs by characterizing them using agronomic and diseases related traits. In this study, nineteen OPVs and five checks were phenotypically characterized at the National Crop Resources Research Center in α-lattice design. The results showed highly significant (P < 0.001) variations among the local and introduced OPVs in most of agronomic traits, except plant aspect, grey leaf spot and stem borer. An OPV SUWAN showed the highest grain yield (10.22 t ha-1) performance. The least number of days to anthesis, silking and stem lodging was observed on OPV SITUKA MI. Regarding correlation coefficient analysis, the result showed that positive significant (P < 0.001) correlations were observed between days to anthesis and silking (r = 0.99). The highest negative and significant (P < 0.001) correlation was observed between percentage of fuzarium ear rot and number of kennels per row (r = -0.67).