Abstract
Scald and net blotch are major foliar diseases of barley causing high yield losses worldwide including Ethiopia. Development of varieties with double resistance is an effective approach of managing both diseases. However, the genetic background of the barley parents was not studied for future resistance breeding. Thus, the objective of the study was to assess genotype performances against scald and net blotch, investigate gene effects involved in controlling the diseases for future breeding and suggest better breeding system. Therefore, twenty eight barley genotypes were evaluated in a randomized complete block design with three replications at Holetta in 2015. Combining ability analysis showed general combining ability (GCA) and specific combining ability (SCA) was highly significant (Pi‚£0.01) for initial disease severity, final percent severity and Area under disease pressure curve (AUDPC) for both scald and net blotch except for SCA in initial and AUDPC of net blotch. This revealed the importance of additive and non-additive gene actions in controlling resistance for both diseases. HB1307 and HB42 parents were general combiner for scald and net blotch resistance. The result suggests the possibility of developing diverse populations from superior GCA parents to scald and net blotch through diallel intermating of selected segregants followed by selection at late generations. And final disease rating can be useful for evaluating a large number of barley genotypes to both diseases. Key words: Barley (Hordeum vulgare L.), additive and non additive gene effects, combining ability.
Highlights
Barley (Hordeum vulgare L.) is the fourth most important cereal crop in the world after maize, rice and wheat in production and its world average productivity was about 3.0 tons ha-1while in some top producing countries exceeds 5 tons ha-1 (FAOSTAT, 2016). It is among the first domesticated cereal crops in Ethiopia and its utilization is deep rooted in Ethiopian tradition
Significant grain yield and quality losses has been occurred in Australia on barley due to net blotch (Stepanović et al, 2016) and losses of up to 50% of yield with possible complete loss depending on susceptible cultivar and environmental conditions was reported due to net blotch (Steffenson et al, 1996)
Introduced,DDeveloped by Holetta Agricultural Research Center and released by Debre Berhan Agricultural Research Center, BReleased and developed by Holetta Agricultural Research Center, SRReleased and developed by Sirinka Agricultural Research Center
Summary
Barley (Hordeum vulgare L.) is the fourth most important cereal crop in the world after maize, rice and wheat in production and its world average productivity was about 3.0 tons ha-1while in some top producing countries exceeds 5 tons ha-1 (FAOSTAT, 2016). It is among the first domesticated cereal crops in Ethiopia and its utilization is deep rooted in Ethiopian tradition. The widespread occurrences of barley scald and net blotch foliar diseases is limiting barley production worldwide including Ethiopia (Tekauz 2003; Xi et al, 2008). Sources: (Berhane and Alemayehu, 2011; Wosene et al, 2015)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
