New Zealand Journal of Crop and Horticultural Science
abstracts
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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