Recessive genes controlling resistance to Helminthosporium leaf blight in synthetic hexaploid wheat |
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| Authors: | M Ragiba K V Prabhu R B Singh |
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| Institution: | Hawaii Agriculture Research Center (HARC), 99-193, Aiea Heights Drive Suite 300, Aiea, HI 96701, USA, E-mail: mragiba@hotmail.com;Division of Genetics and National Phytotron Facility, Indian Agricultural Research Institute (IARI), New Delhi 110 012;Amity School of Natural Resources, Environment and Sustainable Development, E-27, Defense colony, New Delhi, India |
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| Abstract: | A study was conducted under controlled environment conditions in a phytotron to determine the nature of the inheritance of resistance Helminthosporium leaf blight (HLB) in a synthetic hexaploid wheat line, ‘Chirya‐3’, against the isolate KL‐8 of Bipolaris sorokiniana from the major wheat growing region of India. Crosses were made between two susceptible lines ‘WH 147’ and ‘Chinese Spring’. Analyses of F1 and F2 populations of these two crosses (‘WH 147’בChirya‐3’ and ‘Chinese Spring’בChirya‐3’) showed that resistance against the isolate in ‘Chirya‐3’ was governed by two recessive genes functioning in a complementary interaction giving an F2 segregation pattern of 1 : 15 (resistant : susceptible). The segregation pattern of the resistant F2 progenies in F3 families from both crosses confirmed that two homozygous recessive genes were responsible for resistance to the isolate of Bipolaris sorokiniana in the synthetic line ‘Chirya‐3’. It is proposed that the genes be designated as hlbr1 and hlbr2. |
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| Keywords: | Triticum aestivum Bipolaris sorokiniana Helminthosporium leaf blight resistance genes segregation ratio |
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