Research Article

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Cercospora zeae-maydis; Combining ability; Exserohilum turcicum; Gray leaf spot; Northern leaf blight; Zea mays L.

We estimated general and specific combining abilities and examined resistance to northern leaf blight (Exserohilum turcicum) and to gray leaf spot (Cercospora zeae-maydis) in a set of nine inbred popcorn lines. These inbreds were crossed in a complete diallel scheme without reciprocals, which produced 36 F1 hybrids. Two experiments with a square lattice design ... more

R.A. Vieira; C.A. Scapim; L.M. Moterle; D.J. Tessmann; T.V. Conrado; A.T.Amaral Júnior
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Combining ability; Heterotic group; Heterotic grouping methods; Simple sequence repeat markers; Tropical heterotic maize; Zea mays L.

The objectives of the present study were to determine heterotic groups of germplasm lines of tropical maize by test crosses and by simple sequence repeat (SSR) markers and to compare five grouping methods of heterogeneous maize. Sixteen lines of nine populations in the S5 generation were evaluated in test crosses with three testers. The results of four experimental trials over two ... more

C.G. Aguiar; I. Schuster; A.T.Amaral Júnior; C.A. Scapim; E.S.N. Vieira
10/07/2008
Combining ability; diallel analysis; Heterosis; Zea mays L.

With the aim of estimating genetic parameters and identifying superior popcorn combinations, 10 parents were crossed in a circulant diallel and evaluated together with the 15 resulting hybrids at two locations in two growing seasons for grain yield, number of broken plants, number of partially husked ears and popping expansion. The hybrids were less sensitive to environmental variations than ... more

R.M. Rangel; A.T.Amaral Júnior; C.A. Scapim; S.P.Freitas Júnior; M.G. Pereira
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Combining ability; Heterosis; Line x tester analysis; Salinity; Seedlings; Tomato

We attempted to find the suitable parents for the development of tomato hybrids for high salt soils by exploiting combining ability, gene action and heterosis. Six salt-tolerant and three salt-intolerant genotypes, along with their 18 F1 crosses, were evaluated at seedling stage under 10 and 15 dS/m (NaCl) salinity stress, compared to the control level of salinity. The experiment was laid ... more

A. Saeed; M.Q. Shahid; S.A. Anjum; A.A. Khan; A. Shakeel; M.F. Saleem; N. Saeed
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Combining ability; Egg production; Haugh unit

This study aimed to assess egg laying and egg quality in quail lines in diallel crosses. We evaluated 16 genetic groups obtained from crosses of four strains of meat quails (L1, L2, L3, and L4) in a complete diallel. We assessed weekly egg number (WEN), egg yield (EY), egg weight (EW), and Haugh unit (HU) for: 51-80, 81-110, 111-140, and 51-140 days (whole period) old. The general ... more

E.C.S. Drumond; A.V. Pires; C.M. Bonafé; S.R.F. Pinheiro; R.C. Veloso; J.M. Amaral; L.R.A. Abreu
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Carica papaya; Combining ability; Diallel cross; Quantitative genetics

Diallel crossing methods provide information regarding the performance of genitors between themselves and their hybrid combinations. However, with a large number of parents, the number of hybrid combinations that can be obtained and evaluated become limited. One option regarding the number of parents involved is the adoption of circulant diallels. However, information is lacking regarding ... more

M. Vivas; S.F. Silveira; A.P. Viana; A.T. Amaral; D.L. Cardoso; M.G. Pereira
10/22/2002
Beef cattle; Heritability; Selection; Tropics; Weights

(Co)variance components and genetic parameters were estimated for body weights of an elite Brahman herd under a designed, supervised management and genetic program, including strategic artificial insemination (AI). Restricted maximum likelihood methods were used with a univariate animal model for birth weight (BW) and a bivariate model for weaning weight (205-day weight, 205W) and 18 ... more

D. Plasse; O. Verde; J. Arango; L. Camaripano; H. Fossi; R. Romero; C.Rodriguez M.; J.L. Rumbos
09/23/2002
Capsicum annuum; Gene action; Heritability; Meloidogyne incognita; Monogenic inheritance; Resistance

Root-knot nematodes of the genus Meloidogyne are important pathogens affecting vegetable crop production in Brazil and worldwide. The pepper species Capsicum annuum includes both hot and sweet peppers; very little emphasis has been placed on breeding sweet peppers for nematode resistance. We report on the inheritance of resistance to Meloidogyne incognita ( ... more

F. de Souza-Sobrinho; W.Roberto Maluf; L.A.A. Gomes; V.Paulo Campos
03/28/2002
Asparagus officinalis L.; Heritability; Parent-offspring regression method; Selective criteria

To estimate the heritability values of characters frequently used as selective criteria, 32 half-sib families obtained from selected plants of three populations of the asparagus variety Argenteüil were evaluated in a randomized complete block design. The following characters were measured: days to emergence of the first spear, number and diameter of spears, number of stalks, plant ... more

V. Cravero; E. Cointry; I. Gatti; F.López Anido
09/30/2004
Carcass traits; Cattle; Heritability; Slaughter end points

We present estimates of heritability for carcass traits of cattle published in the scientific literature. Seventy-two papers published from 1962 to 2004, which reported estimates of heritability for carcass traits, were reviewed. The unweighted means of estimates of heritability for 14 carcass traits by slaughter end point (age, weight, and fat depth) were calculated. Among the three end ... more

A.Ríos Utrera; L.Dale Van Vleck

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