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EVALUATION OF INTERVARIETAL MAIZE CROSSES THROUGH PARTIAL DIALLEL SCHEME

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Author(s): ALTAIR TOLEDO MACHADO | LUCIANO LOURENÇO NASS | CLESO ANTONIO PATTO PACHECO

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 7;
Issue: 3;
Start page: 291;
Date: 2008;
Original page

Keywords: Local varieties | Intervarietal hybrids | Partial diallel | Zea mays L.

ABSTRACT
Thirty-six genotypes, including five local open-pollinated varieties, five improved open-pollinated varieties, their respective hybrids, and a commercial variety used as control, were evaluated in two environments using a partial diallel scheme. The objective was to identify crosses with high yield potential and favorable agronomic characteristics, such as earliness and plant architecture. The following traits were evaluated: male and female flowering, plant height, ear height, and grain yield. Due to non-significant environmental effects, diallel analysis were performed using the mean of the two production systems. Carioca (375.46), a local open-pollinated variety, and the improved open-pollinated variety BR 106 (731.36) showed the highest estimates for general combining ability (GCA). The highest estimates for specific combining ability (SCA) were observed for the intervarietal hybrids Pedra Dourada x Sol da Manhã (1071.44), Carioca x BR 106 (789.94), Palha Roxa SC x BRS 4150 (786.84), and Palha Roxa ES x Eldorado (768.04). The results show that the improved varieties BR 106, BRS 4150, and Eldorado can contribute to the improvement of the local varieties, increasing genetic variability and other agronomic characteristics such as plant architecture and grain yield.
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