Inheritance of resistance to Brown Spot Disease in upland rice in Uganda
Abstract
171 words
Low yields in rice (Oryza sativa) are attributed by many factors including diseases which
represent one of the main constraints. The Brown spot disease (caused by Helminthosporium
oryzae) in most rice growing areas cause’s considerable losses which could be averted
through development and deployment of resistant varieties. In this study, field trials and
screenhouse experiments were conducted at National Crops Resources Research Institute
(NaCRRI) – Namulonge, Uganda during 2013/2014 with the objective of identifying new
sources of resistance to brown spot disease in rice, establishing the mode of inheritance for
resistance to brown spot disease and characterising F2 progenies of specific crosses for
segregating pattern of reaction to brown spot disease. Among the hundred tested rice lines,
eighteen lines was rated as highly resistant, fifty two resistant, twenty seven moderately
resistant and three lines were susceptible.The results revealed that there was significant
variation for brown spot resistance among genotypes tested. The identified resistant lines
may be brought forward and involved in rice breeding program for development of brown
spot resistant lines.
Subjects
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