Breeding Double Hybrids of Maize with Early Flowering and Physiological Maturity

Maize( Zea mays L.) is a good model for studying genetics and applying plant breeding and improvement, as it has a high ability to genetically adapt to a wide range of conditions. It requires implementing breeding programs for the maize crop to produce seeds of double hybrids and introduce them into agriculture because of their good specifications in production. It results from the multiplication of single hybrids that are characterized by their strong growt, and increase its grains compared to the plants used in the production of single hybrids. The extent to which genetic variants exist across plants is the primary determinant of the success of any breeding operation, including those aimed at enhancing maize varieties. Although phenotypic variations are detectable in every setting, they do not solely reflect the impact of genetic variations; rather, they reflect the impact of environmental variability, growth factors, and the interplay between genotype and environment. Maize is distinguished by its genetic and phenotypic variation, as well as its ability to adapt in different environments, noting that each environment has its hybrids and varieties. Suitability: The most appropriate sowing date for the growth of maize is one of the rules relied upon in growing the crop, especially in the fall season, as physiological maturity may be accompanied by rainfall, a decrease in temperature, and an increase in relative humidity, which negatively affects the grain yield in quantity and quality, so Early flowering and physiological maturity are important determinants in choosing the appropriate genotype for cultivation.