Inbreeding depression and genetic components for popping expansion and other traits in Brazilian populations of popcorn

E. Arnhold, J.M.S. Viana, F. Mora, G.V. Miranda, and R.G. Silva. 2010. Inbreeding depression and genetic components in Brazilian populations of popcorn. Cien. Inv. Agr. 37(3):125-132. The aim of the study was to assess inbreeding depression and determine genetic components in landrace populations of popcorn. Six Brazilian popcorn landraces: Amarelo, Beija-Flor, Branco, Rosa-claro, Roxo and Vicosa, were subjected to self-pollination. Experiments with S0 populations and their selfing populations (S1) were conducted in a randomized complete block design. The estimates of inbreeding depression varied from 1.2% (popping expansion) to 79% (grain yield). The gene action was predominantly additive for plant height, ear height and hundred-grain-weight. The dominance genetic effects were important for index of prolificacy and grain yield. The genetic effect of popping expansion was bidirectional with null dominance and a predominance of additive gene effects. Based on these results, it was possible to identify popcorn populations suitable to extract inbred lines, develop hybrids and use in population improvement. The present study also confirmed that popping expansion is a trait that can be improved efficiently by recurrent selection programs of popcorn.

[1]  Emmanuel Arnhold,et al.  Eficiências relativas de métodos de seleção de famílias endogâmicas em milho-pipoca - DOI: 10.4025/actasciagron.v31i2.578 , 2009 .

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

[3]  F. Mora,et al.  Evaluation of top-cross popcorn hybrids using mixed linear model methodology. , 2009 .

[4]  F. Mora,et al.  Genetic gain prediction of the third recurrent selection cycle in a popcorn population , 2008 .

[5]  Carlos Alberto Scapim,et al.  Heredabilidad de la sobrevivencia en 169 familias de maíz-roseta de granos blancos: Un enfoque Bayesiano , 2008 .

[6]  C. Pacheco,et al.  Heterozygosity following half-sib recurrent selection in popcorn using isoenzyme markers , 2008 .

[7]  L. M. Guimarães,et al.  Genetic variability and heterotic groups of Brazilian popcorn populations , 2008, Euphytica.

[8]  A. Stephenson,et al.  Inbreeding depression in Solanum carolinense (Solanaceae), a species with a plastic self-incompatibility response , 2008, BMC Evolutionary Biology.

[9]  Carlos Alberto Scapim,et al.  Predicción de Valores Genéticos del Efecto de Poblaciones de Maíz Evaluadas en Brasil y Paraguay , 2007 .

[10]  H. Ceballos,et al.  Analysis of Inbreeding Depression in Eight S1 Cassava Families , 2009 .

[11]  A. D. L. Braccini,et al.  Componentes genticos de mdias e depresso por endogamia em populaes de milho-pipoca , 2006 .

[12]  J. Berdahl,et al.  Comparison of S 1 with Open-Pollination Progenies in Selection for Yield in Crested Wheatgrass , 2004 .

[13]  G. Simon,et al.  Depresso por endogamia em populaes de milho-pipoca , 2004 .

[14]  J. Viana,et al.  Analysis of general and specific combining abilities of popcorn populations, including selfed parents , 2003 .

[15]  J. M. S. Viana,et al.  Eficiências relativas dos processos de seleção entre e dentro de famílias de meios-irmãos em população de milho-pipoca , 2003 .

[16]  R. Bernardo,et al.  Mapping QTL for popping expansion volume in popcorn with simple sequence repeat markers , 2003, Theoretical and Applied Genetics.

[17]  C. Cruz,et al.  Inbreeding depression of 28 maize elite open pollinated varieties , 2002 .

[18]  G. Zargar,et al.  Estimation of genetic variances in a maize composite , 2001 .

[19]  J. Brewbaker,et al.  Diallel analyses of temperate and tropical popcorns , 1999 .

[20]  G. Wiegertjes,et al.  Immunogenetics of disease resistance in fish: a comparative approach. , 1996, Developmental and comparative immunology.

[21]  J. Miranda-Filho,et al.  Inbreeding depression rates of semi-exotic maize (Zea mays L.) populations , 1995 .

[22]  S. M. Dofing,et al.  Inheritance of Expansion Volume and Yield in Two Popcorn ✕ Dent Corn Crosses , 1991 .

[23]  P. B. Gallo,et al.  Inbreeding depression in Brazilian populations of maize (Zea mays L.) , 1984 .

[24]  A. Hallauer,et al.  Quantitative Genetics in Maize Breeding , 1981 .

[25]  A. Hallauer,et al.  Inbreeding Depression in Maize by Selfing and Full-sibbing 1 , 1977 .

[26]  A. Hallauer,et al.  Changes in Quantitative Traits Associated with Inbreeding in a Synthetic Variety of Maize 1 , 1973 .