17Jul 2017

EVALUATION OF ELITE SWEETPOTATO GENOTYPES FOR RESISTANCE TO SWEETPOTATO VIRUS DISEASE IN SOUTHERN ETHIOPIA.

  • South Agricultural Research Institute, Hawassa Research Center, P.O. Box 06, Hawassa, Ethiopia.
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Sweetpotato is commonly grown in the south, south western and eastern parts of Ethiopia. The production trend of sweetpotato in Ethiopia is increasing in terms of area and volume of production and the country has very suitable climatic and edaphic conditions for its production. However, the productivity of the crops is very low as compared to its potential. Sweetpotato virus disease (SPVD) is one of the major problems which limit sweetpotato production and productivity, particularly in southern Ethiopia. Although different sweetpotato varieties have been released in Ethiopia, there is no variety which is resistant to the disease. Therefore, field experiment was conducted to identify SPVD resistant sweetpotato varieties under field conditions at Hawassa, Dilla and Halaba districts in southern Ethiopia during 2014-2015 cropping seasons. Eleven elite genotypes advanced from previous screening trial, two previously released varieties, one currently released variety (Mae), a susceptible variety (Guntute) and one local check were evaluated using a randomized complete block design with three replications. Variety Guntute was used as inoculum source and disease spreader during the study. Through visual assessment and serological test, only four genotypes have showed resistant reaction to the common SPVDs. The remaining 12 genotypes were infected with at least one of the major virus types (sweetpotato feathery mottle virus or sweetpotato chlorotic stunt virus). The four sweetpotato genotypes that were identified as resistant to SPVD were TIS-8250-1, TIS-70357-2, CN-1754-5, and CN-1752-6. These genotypes yielded 49.2, 45.3, 46.8 and 46.6 t ha-1, respectively, with yield advantage of 262.4 to 283.3% over the local check and 43 to 56% over the standard check. The genotypes are promising for registration as a variety after verification and can be recommended for direct production as well as donor parents for breeding program aiming at development of sweetpotato varieties resistant to SPVD.

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[Shiferaw Mekonen, Fekadu Gurmu and Tesfaye Tadesse. (2017); EVALUATION OF ELITE SWEETPOTATO GENOTYPES FOR RESISTANCE TO SWEETPOTATO VIRUS DISEASE IN SOUTHERN ETHIOPIA. Int. J. of Adv. Res. 5 (Jul). 77-83] (ISSN 2320-5407). www.journalijar.com

Fekadu Gurmu
South Agricultural Research Institute

DOI:

Article DOI: 10.21474/IJAR01/4695      
DOI URL: http://dx.doi.org/10.21474/IJAR01/4695

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