Research Article

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12/01/2009
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
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
06/12/2015
Genetic diversity; Heterotic group; Simple sequence repeat markers; Zea mays L.

The objective of the current study was to apply molecular markers (microsatellites) in the analysis of genetic diversity of 48 lines of the elite maize germplasm stored in the bank of the Cooperativa Central de Pesquisa Agrícola - Coodetec, PR, Brazil, and estimate the correlation between genetic distance and heterosis and hybrid performance from the crosses among these maize lines. Forty ... more

E.H. Fernandes; I. Schuster; C.A. Scapim; E.S.N. Vieira; M.M.D. Coan
08/23/2011
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
12/13/2013
Combining ability; Elsinoe ampelina; Heritability; Scab; Vitis spp

Downy mildew (Plasmopara viticola) and anthracnose (Sphaceloma ampelinum) are two of the major diseases of most grapevine (Vitis vinifera L.) cultivars grown in Thailand. Therefore, breeding grapevines for improved downy mildew and anthracnose resistance is crucial. Factorial crosses were made between three downy mildew and/or anthracnose resistant lines ('NY88. ... more

O. Poolsawat; S. Mahanil; P. Laosuwan; S. Wongkaew; A. Tharapreuksapong; B.I. Reisch; P.A. Tantasawat
10/07/2014
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
07/02/2014
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
12/12/2014
Genetic divergence; Simple sequence repeat markers; Sweet corn; Zea mays L.

The purpose of this study was to analyze the genetic diversity of 15 sugary-1 sweet corn lines by microsatellite markers. One hundred pairs of simple sequence repeat primers that were mapped for field corn were tested. Of these primers, 15% were polymorphic, and all were selected for the evaluation. These primers identified a total of 39 alleles among the 15 loci that were ... more

A.D. Lopes; C.A. Scapim; C.A. Mangolin; M.F.P.S. Machado
10/05/2007
Combining ability; Endogamy; Inbred lines; Microsporogenesis; Popcorn

Endogamy places genes for several characteristics in homozygosis, which include those related to meiosis causing abnormalities that may impair gamete viability. An original population (S0) of popcorn (CMS-43) produced by Embrapa Maize and Sorghum was self-pollinated for seven years, generating inbred lines (S1 to S7). Conventional studies of microsporogenesis revealed ... more

G.C.L. Ricci; N. Silva; M.S. Pagliarini; C.A. Scapim
10/24/2016
Combining ability; Line x tester; SSR; Water stress tolerance

Sunflower cannot produce high yields under water-limiting conditions. The aim of the present study was to prevent the impediments on yield and to develop varieties with high-yield potential under water scarce conditions. For achieving this objective, it is necessary to detect parents with desirable traits that mainly depend on the action of genes controlling the ... more

M. Saba; F.A. Khan; H.A. Sadaqat; I.A. Rana

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