Genetic resistance of maize inbred lines to Striga hermonthica
Paper Details
Genetic resistance of maize inbred lines to Striga hermonthica
Abstract
Maize is one of the most important food security crops in Uganda. It is annually cultivated in an area of 1,063,000 hectares representing 57% of the total area allocated to crop production in the country. However, maize yields are very low due to several biotic and abiotic stresses, institutional and socio-economic constraints. Among the biotic factors, Striga hermonthica inflicts significant yield losses reaching up to 100% in highly infested fields. In the present study, the gene action for resistance to Striga among selected maize inbred lines was assessed. Ten inbred lines of varying resistance to Striga hermonthica were crossed in a 10×10 half diallel to generate 45 single crosses. These were evaluated in three Striga endemic locations of Eastern and Western Uganda during 2017A growing season. General combining ability (GCA) effects for AUSNPC were generally low with negative GCA effects of -646.99, -428.21, -338.00 and -76.51 for parents TZISTR1199, TZISTR1192, TZISTR1174 and TZISTR1162. Specific combining ability (SCA) effects were also generally low for area under Striga number progressive curve (AUSNPC) showing good resistance to the parasitic weed.
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