Recurrent selection for grain yield in a maize (Zea mays L.) population. Direct and correlated responses for morphological and physiological traits

altezza altura contenido de materia seca crop yield dry matter content ensemencement espigas feuille fioritura floraison flowering foglie fotosintesi grain granella granos hauteur height hojas humedad humidity leaf area leaves maturation maturazione biologica orientamento orientation photosynthese photosynthesis recurrent selection rendement des cultures rendimiento de cultivos selezione ricorrente semina siembra sowing spighe spikes superficie foliar surface foliaire zea mays