Combining ability

Efficiency of circulant diallels via mixed models in the selection of papaya genotypes resistant to foliar fungal diseases

M. Vivas, Silveira, S. F., Viana, A. P., Amaral, Jr., A. T., Cardoso, D. L., and Pereira, M. G., Efficiency of circulant diallels via mixed models in the selection of papaya genotypes resistant to foliar fungal diseases, vol. 13, pp. 4797-4804, 2014.

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 diallel analysis using mixed models.

Egg laying and egg quality in meat type quails in diallel crosses

E. C. S. Drumond, Pires, A. V., Bonafé, C. M., Pinheiro, S. R. F., Veloso, R. C., Amaral, J. M., and Abreu, L. R. A., Egg laying and egg quality in meat type quails in diallel crosses, vol. 13, pp. 8118-8125, 2014.

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 combining capacity (GCC) showed significance for WEN and EY, with the exception of the period of 111-140 days. In general, L3 had the highest positive GCC estimates.

Inheritance of downy mildew (Plasmopara viticola) and anthracnose (Sphaceloma ampelinum) resistance in grapevines

O. Poolsawat, Mahanil, S., Laosuwan, P., Wongkaew, S., Tharapreuksapong, A., Reisch, B. I., and Tantasawat, P. A., Inheritance of downy mildew (Plasmopara viticola) and anthracnose (Sphaceloma ampelinum) resistance in grapevines, vol. 12, pp. 6752-6761, 2013.

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 ('NY88.0517.01', 'NY65.0550.04', and 'NY65.0551.05'; male parents) and two or three susceptible cultivars of V. vinifera ('Black Queen', 'Carolina Black Rose', and/or 'Italia'; female parents).

Genetic analysis of NaCl tolerance in tomato

A. Saeed, Shahid, M. Q., Anjum, S. A., Khan, A. A., Shakeel, A., Saleem, M. F., and Saeed, N., Genetic analysis of NaCl tolerance in tomato, vol. 10, pp. 1754-1776, 2011.

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.

Genetic parameters in parents and hybrids of circulant diallel in popcorn

R. M. Rangel, Júnior, A. T. Amaral, Scapim, C. A., Júnior, S. P. Freitas, and Pereira, M. G., Genetic parameters in parents and hybrids of circulant diallel in popcorn, vol. 7, pp. 1020-1030, 2008.

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 the parents of the diallel in the 2003/2004 and 2004/2005 growing seasons. The genetic parameters suggested possible genetic gains for grain yield and popping expansion, mainly.

Heterotic groups in tropical maize germplasm by test crosses and simple sequence repeat markers

C. G. Aguiar, Schuster, I., Júnior, A. T. Amaral, Scapim, C. A., and Vieira, E. S. N., Heterotic groups in tropical maize germplasm by test crosses and simple sequence repeat markers, vol. 7, pp. 1233-1244, 2008.

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.

Diallel analysis of leaf disease resistance in inbred Brazilian popcorn cultivars

R. A. Vieira, Scapim, C. A., Moterle, L. M., Tessmann, D. J., Conrado, T. V., and Júnior, A. T. Amaral, Diallel analysis of leaf disease resistance in inbred Brazilian popcorn cultivars, vol. 8, pp. 1427-1436, 2009.

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 and three replications were conducted during the 2008/2009 crop season, in Maringá, PR, Brazil.

Microsporogenesis in inbred line of popcorn (Zea mays L.)

G. C. L. Ricci, Silva, N., Pagliarini, M. S., and Scapim, C. A., Microsporogenesis in inbred line of popcorn (Zea mays L.), vol. 6. pp. 1013-1018, 2007.

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 that meiotic abnormalities did not increase with endogamy.

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