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Yield stability of maize (Zea mays L.) genotypes across locations

By: Worku, M | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) Kenya | 7. Proceedings of the Eastern and Southern Africa Regional Maize Conference Nairobi (Kenya) 5-11 Feb 2002.
Contributor(s): Abera, W [coaut.] | Friesen, D.K.|Palmer, A.F.E [eds.] | Girma Taye Awake [coaut.] | Guta, A [coaut.] | Tolessa, B [coaut.] | Tuna, H [coaut.] | Wolde, L [coaut.] | Zelleke, H [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Nairobi (Kenya) KARI*CIMMYT : 2002Description: p. 139-142.ISBN: 970-648-120-6.Subject(s): Crop yield | Crossbreeding | Environmental conditions | Germplasm | Maize | CIMMYT | KARI | Genetic resources | Zea mays AGROVOC | Hybrids AGROVOC | Plant breeding AGROVOCDDC classification: 338.16 Summary: Maize genotypes vary in their response to variable environmental conditions. Twenty genotypes were tested at nine locations in Ethiopia ( 1,100-2,240 masl) in the 1998 cropping season to study their phenotypic yield stability .Analysis of variance and stability analysis were computed. Variances due to genotypes, environments, and G x E interaction were significant. Linear and non-linear components of G x E interactions were also present. Most genotypes had significant deviation mean square (S2di) implying that they were unstable. None of the top yielding genotypes exhibited general adaptability. Some genotypes had relatively good performance in mid and high altitude areas whereas some had good performance in mid and low altitude areas indicating the possibility to develop specific genotypes adapted to mid and high or low and mid altitude areas. However, the top yielding genotypes were specifically adapted indicating that for high yield potential in each mega-environment, a specific breeding programmme is necessary. Results also showed that understanding of the biophysical limitations within the mega-environment will pave the way for genetic improvement for these limitations.Collection: CIMMYT Publications Collection
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Book CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 338.16 FRI (Browse shelf) 1 Available L630188
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Maize genotypes vary in their response to variable environmental conditions. Twenty genotypes were tested at nine locations in Ethiopia ( 1,100-2,240 masl) in the 1998 cropping season to study their phenotypic yield stability .Analysis of variance and stability analysis were computed. Variances due to genotypes, environments, and G x E interaction were significant. Linear and non-linear components of G x E interactions were also present. Most genotypes had significant deviation mean square (S2di) implying that they were unstable. None of the top yielding genotypes exhibited general adaptability. Some genotypes had relatively good performance in mid and high altitude areas whereas some had good performance in mid and low altitude areas indicating the possibility to develop specific genotypes adapted to mid and high or low and mid altitude areas. However, the top yielding genotypes were specifically adapted indicating that for high yield potential in each mega-environment, a specific breeding programmme is necessary. Results also showed that understanding of the biophysical limitations within the mega-environment will pave the way for genetic improvement for these limitations.

English

0410|AGRIS 0401|AL-Maize Program

Juan Carlos Mendieta

CIMMYT Publications Collection

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