Abstract
This study aimed to elucidate the maternal and paternal genetic effects of the physiological quality of hybrid seed corn over time, as well as the contribution of heterosis for this trait. The seeds of single hybrids, reciprocals and parents were obtained by manual crosses in a complete diallel cross scheme. The analyses of germination and accelerated aging were performed and the data were analyzed with Tukey test and Griffing method. The quadratic components of general combining ability were similar to the effects of specific combining ability and superior to reciprocal, in most evaluation periods, implying that the effects on seed quality characters were attributed to genes of additive effect and genes of non-additive effect. The maternal effect of corn seed longevity was highly significant however its contribution was smaller than general combining ability and specific combining ability effects, but proved to be important in combinations of parents with lower estimate of general combining ability.
Highlights
In maize crop (Zea mays L.), the demand for seed hybrids with high performance and high physiological quality, has increased due to the importance of the crop in Brazilian agricultural scenario, driven mainly by growth in the off-season market
According to Oliveira et al (2013), during corn seed breeding programs, there is no targeting for physiological quality traits, which can compromise the spread of the hybrid on the market
The term seed quality represents the sum of all attributes, genetic, physical, physiological and sanitary, involved in its production process, as well as the management adopted during its processing and storage, which guarantee high germination and vigor, influencing the establishment of the plants and the high productivity of a crop (Moterle et al, 2011; Moterle et al, 2012; Andrade et al, 2013)
Summary
In maize crop (Zea mays L.), the demand for seed hybrids with high performance and high physiological quality, has increased due to the importance of the crop in Brazilian agricultural scenario, driven mainly by growth in the off-season market The term seed quality represents the sum of all attributes, genetic, physical, physiological and sanitary, involved in its production process, as well as the management adopted during its processing and storage, which guarantee high germination and vigor, influencing the establishment of the plants and the high productivity of a crop (Moterle et al, 2011; Moterle et al, 2012; Andrade et al, 2013) Among these attributes, the physiological quality of the seed is important when it desired to obtain new hybrids, since it is related to germination capacity, vigor and longevity of the seed that directly affect the production
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