Pattern analysis of genotype × environment interaction for striga resistance and grain yield in African sorghum trials

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• 作者：Haussmann ; B.I.G. ; Hess ; D.E. ; Reddy ; B.V.S. ; Mukuru ; S.Z. ; Kayentao ; M. ; Welz ; H.G. ; Geiger ; H.H.
• 关键词：genotype ¡Á environment interaction ; Kenya ; Mali ; Sorghum bicolor ; Striga hermonthica ; resistance
• 刊名：Euphytica
• 出版年：2001
• 出版时间：2001
• 年：2001
• 卷：122
• 期：2
• 页码：297-308
• 全文大小：219 KB

文摘

The parasitic weed Striga hermonthica (Del.) Benth. seriously limitssorghum [ Sorghum bicolor (L.) Moench] production in Sub-SaharanAfrica. As an outbreeder, S. hermonthica is highly variable with anextraordinary capacity to adapt to different hosts and environments,thereby complicating resistance breeding. To study genotype ×environment (G × E) interaction for striga resistance and grain yield, nine sorghum lines, 36 F$\_2$ populations and five local checks were grownunder striga infestation at two locations in both Mali and Kenya. Meansquares due to genotypes and G × E interaction were highly significant forboth sorghum grain yield and area under striga severity progress curve(ASVPC, a measure of striga emergence and vigor throughout the season).For grain yield, the entry × location-within-country interaction explainedmost of the total G × E while for ASVPC, entry × country and entry × location-within-country interactions were equally important. Pattern analysis(classification and ordination techniques) was applied to theenvironment-standardized matrix of entry × environment means. Theclassification clearly distinguished Malian from Kenyan locations forASVPC, but not for grain yield. Performance plots for different entrygroups showed differing patterns of adaptation. The ordination biplotunderlined the importance of entry × country interaction for ASVPC. TheF$\_2$ derived from the cross of the striga-resistant line Framida with thestriga-tolerant cultivar Seredo was the superior entry for both grain yieldand ASVPC, underlining the importance of combining resistance withtolerance in striga resistance breeding. The observed entry × countryinteraction for ASVPC may be due to the entries' different reactions toclimatic conditions and putative differences in striga virulence in Mali andKenya.