Combining ability of tropical maize cultivars in organic and conventional production systems

The objectives were to identify maize germplasm for the organic productions system and to compare the genetic effects of the grain yield of maize cultivars in organic and conventional production systems. Diallel crosses were made between six maize cultivars and the hybrid combinations were evaluated in conventional and organic production systems. The hybrid combinations produced different grain yields in the two production systems. The interaction between general combining ability and production systems was significant for grain yield, ear height and number of ears. This indicates that the additive genetic effects differ in organic and conventional production systems. The specific combining abilities (SCA) were significant for grain yield and plant height, indicating a significant difference between the non-additive effects. However, the SCA x production systems interactions were not significant for those traits. It was concluded that for the development of maize cultivars for the organic production system, selection must be made in the specific environment for the expression of favorable alleles that confer advantages for adapting to this system; the general combining ability of genitors is different for the two production systems, but the specific combining ability isn't different in organic and conventional systems.

[1]  J. C. Galvão,et al.  Inter-relações de nitrogênio e fósforo na capacidade de combinação e na seleção em milho , 2010 .

[2]  L. R. Oliveira,et al.  COMPORTAMENTO DE CULTIVARES DE MILHO PRODUZIDOS ORGANICAMENTE E CORRELAÇÕES ENTRE CARACTERÍSTICAS DAS ESPIGAS COLHIDAS NO ESTÁDIO VERDE , 2010 .

[3]  R. Fritsche‐Neto,et al.  Factor analysis and SREG GGE biplot for the genotype × environment interaction stratification in maize , 2010 .

[4]  G. V. Miranda,et al.  Herança de caracteres associados à eficiência de utilização do fósforo em milho , 2010 .

[5]  L. M. Guimarães,et al.  Multivariate analyses of genotype x environment interaction of popcorn , 2009 .

[6]  J. C. Galvão,et al.  Controle genético da produção de grão e da eficiência de uso do nitrogênio em milho tropical , 2008 .

[7]  H. Geiger,et al.  Quantitative genetic studies on breeding maize for adaptation to organic farming , 2008, Euphytica.

[8]  G. V. Miranda,et al.  Potencial genético da população de milho UFV 7 para o melhoramento em Minas Gerais , 2008 .

[9]  E. T. Lammerts van Bueren,et al.  Plant breeding for organic and sustainable, low-input agriculture: dealing with genotype–environment interactions , 2008, Euphytica.

[10]  H. Piepho,et al.  Comparing the performance of cereal varieties in organic and non-organic cropping systems in different European countries , 2008, Euphytica.

[11]  K. Kristensen,et al.  Importance of growth characteristics for yield of barley in different growing systems: will growth characteristics describe yield differently in different growing systems? , 2008, Euphytica.

[12]  D. Desclaux,et al.  Developments in breeding cereals for organic agriculture , 2008, Euphytica.

[13]  G. V. Miranda,et al.  PARENTAL COMMERCIAL MAIZE SELECTION FOR SILAGE PRODUCTION , 2008 .

[14]  L. M. Guimarães,et al.  Genetic control of grain yield and nitrogen use efficiency in tropical maize , 2008 .

[15]  J. C. Galvão,et al.  PRODUTIVIDADE DE MILHO EM DIFERENTES SISTEMAS PRODUTIVOS , 2007 .

[16]  S. Lyon,et al.  Evidence of varietal adaptation to organic farming systems , 2007 .

[17]  Paul C. Struik,et al.  The consequences of the concept of naturalness for organic plant breeding and propagation , 2004 .

[18]  S. Ceccarelli.  Adaptation to low/high input cultivation , 2004, Euphytica.

[19]  J. C. Galvão,et al.  Controle gentico da resistncia aos enfezamentos do milho , 2003 .

[20]  P. Struik,et al.  Ecological concepts in organic farming and their consequences for an organic crop ideotype , 2002 .

[21]  J. C. Souza,et al.  ALTERNATIVES FOR OBTAINING DOUBLE CROSS MAIZE HYBRIDS , 2002 .

[22]  G. Atlin,et al.  Breeding crop varieties for low-input agriculture , 1989 .

[23]  B Griffing,et al.  Concept of general and specific combining ability in relation to diallel crossing systems , 1956 .