Título:	Inheritance of kernel row number, a multicategorical threshold trait of maize ears.
Autoria:	TOLEDO, F. H. R. B. RAMALHO, M. A. P. ABREU, G. B. SOUZA, J. C. de
Afiliação:	FERNANDO H. R. B. TOLEDO, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, Universidade de São Paulo.; M. A. P. RAMALHO, Departamento de Biologia, Universidade Federal de Lavras.; GUILHERME BARBOSA ABREU, CPACP; J. C. de SOUZA, Departamento de Biologia, Universidade Federal de Lavras.
Ano de publicação:	2011
Referência:	Genetics and Molecular Research, v. 10, n. 3, p. 2133-2139, 2011.
Páginas:	7 p.
Conteúdo:	Information about the inheritance of threshold traits is scarce, especially in plants. We examined the genetic control of kernel row number in maize (Zea mays). Knowledge of this inheritance is especially important because it is a primary component of grain yield. This trait has a discontinuous distribution. Characters like these are conceptualized as threshold traits. Crosses were made between the inbred line Geneze 3 (G3) with many kernel rows and the inbreds Argentino IV (A4) and Dente de Cravo (DC), with fewer kernel rows. The F1 and F2 generations and the backcrosses BC11 and BC21 were obtained for the combinations G3 x A4 and G3 x DC. These populations were evaluated under field conditions, and the kernel row number was determined by direct counting of approximately 14, 140 and 75 ears for the F1, F2 and backcrosses, respectively. Genetic control was determined through estimates of generation means and variance analysis and was also performed by Wright?s method for threshold traits. It was found that genetic control is predominantly due to additive alleles. The component a, was greater than zero, additive variance was positive and the variance of dominance did not differ from zero. In the F2 generation, the range of the kernel row number was 10 to 28 in G3 x A4, while in G3 x DC it was 12 to 26. Inheritance of the number of kernel rows, estimated by the two methods, gave similar results. This correspondence is due to adjusting of the data to the normal distribution.
Thesagro:	Melhoramento vegetal Milho
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPACP)