Performance of five generations of selection for increased stalk diameter in the Lancaster variety of maize (Zea mays, L.), crossed with B73 inbred
2001; Experimental Institute for Cereal Growing; Volume: 46; Issue: 4 Linguagem: Inglês
ISSN
2279-8013
AutoresLluís Bosch Roura, Francesc Casañas Artigas, Esther Sánchez, Antonio Rafael Almirall Malivern, Fernando Nuez Viñals,
Tópico(s)Agronomic Practices and Intercropping Systems
ResumoMass selection of 5% intensity for increased stalk diameter, controlling both parents, was conducted over five generations (S 1 to S 5 ) in the Lancaster maize (Zea mays, L.) variety. The five generations of mass selection plus the original Lancaster population (S 0 ) were crossed with inbred B73 to assess the hybrid performance for both grain and forage harvest. The hybrids showed, significant (p≤0.05) increases in stalk diameter, production traits (ear, stover, and total dry digestible matter yields), and plant size (number of leaves, ear height, and total height). Neutral detergent fibre (NDF) decreased significantly while other traits related to the nutritive quality of the stover did not change significantly. The traits showing significant differences in the hybrid populations are the same ones that showed significant differences with mass selection in the Lancaster populations per se. With the exception of NDF, these differences (S 5 xB73 -S 0 xB73) are of the same sign and smaller than those found in Lancaster populations per se (S 5 - S 0 ). The results support the selection of stalk diameter for increased grain and forage yields.
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