8th INTERNATIONAL WHEAT CONFERENCE

gxe INTeRACTIoN effeCTS oN gRAIN yIeLd of TWeNTyfIVe
BReAd WheAT (TRITICum AeSTIVum L.) geNoTyPeS
gRoWN duRINg The 2009 WINTeR SeASoN IN zImBABWe
Tegwe Soko 1 and Ephrame Havazvidi 2
1 Wheat breeder, Seed-Co Limited, Rattray Arnold Research Station, P. O. BOX CH142,
Chisipite, Harare, Zimbabwe.
2 Group Research Manager and Wheat Breeder, Seed-Co Limited, Rattray Arnold Research
Station, P. O. BOX CH142, Chisipite, Harare, Zimbabwe.
E-mail Address of presenting author: tegweso@rars.seedco.co.zw or tegwe@yahoo.co.uk
The additive main effects and multiplicative interaction (AMMI) analysis was performed
to assess the yield stability of twenty-five bread wheat (Triticum aestivum L.) genotypes
grown across seven different geographical sites (RARS, ART, SRC, Arundel farm,
Sisal farm, Chiredzi and KRC) under three management practices (Normal planting,
Late planting and Deficit irrigation) during the 2009 winter cropping season. The experiment
was laid out using a 5 x 5 Lattice Square Design with four replications. The
AMMI analysis of variance for grain yield indicated that the genotypes, environments
and GxE interaction were significantly different (p9000kg/ha) are achievable in high
altitude areas of Zimbabwe (above 1200 meters above sea level) as compared to low
altitude areas (below 800 meters above sea level). It was possible to characterize both
genotypes and environments using the dendograms and the AMMI model can be used to
select genotypes with specific or broad adaptation.
Key words: AMMI; Triticum aestivum; Yield stability; Cluster Dendogram
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