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HEALTH AND PHYSIOLOGICAL QUALITY OF DOUBLE-CROSSES MAIZE HYBRIDS SEEDS OBTAINED FROM F1 AND F2 GENERATIONS OF SINGLE CROSSES HYBRIDS

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Author(s): PAULA NOTINI LOBATO | RENZO GARCIA VON PINHO | ÉDILA VILELA DE RESENDE VON PINHO | MAGNO ANTÔNIO PATTO RAMALHO

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

Volume: 4;
Issue: 1;
Start page: 54;
Date: 2005;
Original page

Keywords: Zea mays L.: heterosis | seed quality: hybrid corn

ABSTRACT
The objective of this work was to compare the health and physiological quality of double crosses-maize hybrid seeds obtained from F1 and F2 generations of single crosses hybrids. Field trials were carried out at the Federal University of Lavras – UFLA in two sowing dates, September and December 2001. Four isolated plots were used in each sowing date to produce seeds of the double hybrids DKB333/AG9012 and DKB901/AG9012. In two plots the female parental consisted of the F1 generations of the single hybrids DKB333 e DKB901 and the male parental was the single cross hybrid AG 9012. On the other two plots, the female parental consisted of F2 generations of the single crosses hybrids DKB333 e DKB901. The following agronomic characteristics were measured: plant height, ear insertion, ear weight and seed production. Seeds, size 22, were used to evaluate: germination, cold test, artificial aging, speed of emergence, emergence in substract of soil and sand mixture, seedling dry weight matter and health analysis by the blotter test. The experimental design was completely randomized using a factorial with two hybrids, two generations (F1 and F2), two sowing dates and four replications. The results showed a 28.7% decrease in seed production when the female parental came from the F2 generation instead of the F1 generation. For both hybrids, DKB901/AG9012 and DKB333/AG9012 sowed in September, the decrease in seed production was around 46% for the plants originated from F2 generation when compared to those from F1 generation. In December the reduction was 10.8%. All physiological assays showed a better performance for seeds obtained from F1 generations of the single hybrids. The same was true for the health tests.
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