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Combining ability between tropical and temperate popcorn lines for seed quality and agronomic traits

2015; Southern Cross Publishing; Volume: 9; Issue: 4 Linguagem: Inglês

1835-2693

Pablo Diego Silva Cabral, Antônio Teixeira do Amaral Júnior, Alexandre Pio Viana, Henrique Duarte Vieira, Ismael Forte Freitas Júnior, Cássio Vittorazzi, Marcelo Vivas,

Seed Germination and Physiology

In popcorn, the involvement of tropical and temperate genotypes is critical for genetic gains in the key traits of grain yield and popping expansion. The present work is the first reported study of combining ability involving reciprocals and seed quality traits in popcorn. Forty-five single crosses and their 45 reciprocals resulting from a system of complete diallel crossing between ten popcorn lines(five temperate and five tropical) were evaluated in two distinct growing seasons (first and second cropping season) for seed quality [field emergence (FE), germination test (GT), modified cold test (MCT) and seedling dry matter (DM)] and agronomic traits [plant height (PH), ear height (EH), popping expansion (PE) and grain yield (GY)]. The results showed that there is a strong reciprocal effect for EH, GY and seed quality, showing the need for prior indication of the male and female parents in crosses. The L53 and L70 lines revealed, simultaneously, favorable estimates of a general combining ability (GCA) for increases in PE and GY in crops during the first harvest, and the L70 lines showed a similar result for crops in the second harvest. The best hybrids regarding PE and GY, during the first harvest, were P1 L70, P1 L76, P3 P7, P7 L54 and P8 L54. For the second harvest, the best hybrids were P1xL53, P1xL76, P8xL53, P8xL54 and P10xL53. P1xL76 and P8xL54 exhibited a good performance for both of the cropping season.