New Zealand Journal of Crop and Horticultural Science abstracts

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Genotype × environment interaction and stability analysis of sweetpotato (Ipomoea batatas) genotypes

Mehmet Emin Caliskan

Department of Crop Science
Mustafa Kemal University
31034 Hatay, Turkey
email: mehmet@mku.edu.tr

Elif Erturk

Department of Horticulture
Mustafa Kemal University
31034 Hatay, Turkey

Tahsin Sogut

Department of Crop Science
Dicle University
Diyarbakir, Turkey

Erkan Boydak

Department of Crop Science
Harran University
Sanliurfa, Turkey

Halis Arioglu

Department of Crop Science
Cukurova University
Adana, Turkey

Abstract Nine introductions of sweetpotato (Ipomoea batatas) of diverse origin and two local genotypes were evaluated for storage root yield and average storage root weight in four locations of Turkey (Diyarbakir and Sanliurfa representing semi-arid environment and Adana and Hatay representing Mediterranean environment) in 2000 and 2001. The genotype × environment (GE) interaction was evaluated for two yield components (mean storage root weight and storage root yield) using the joint regression analysis and the Additive Main Effects and Multiplicative Interaction (AMMI) analysis. Stability of the genotypes over environments was estimated by using different stability parameters. GE interaction was found to be significant for both yield components, and genotype main effect contributed more than environment and GE interaction to total variability. Total storage root yield varied from 6.72 to 112.60 t ha–1, depending on genotypes and environments. The introduced genotypes produced a higher yield than local genotypes. Our study revealed that sweetpotato has a great adaptability and yield potential in irrigated Mediterranean-type and semi-arid environments, whereas non-traditional production areas such as Adana, Diyarbakir, and Sanliurfa may be more suitable for sweetpotato production than Hatay, the traditional production area, because of the potential for higher yield. The AMMI model appeared to be a better option for evaluating both GE interaction and the stability of sweetpotato genotypes in multilocational trials. The stability parameters tested in this study could not identify high yielding and stable genotypes.

Keywords sweetpotato; genotype × environment interaction; stability; AMMI; Turkey

New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35: 87–99
0014–0671/07/3501–0087      © The Royal Society of New Zealand 2007
H05011; Online publication date 20 March 2007. Received 7 February 2005; accepted 24 January 2007

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