Genetic divergence among corn hybrids and combining ability for agronomic and bromatological traits of silage

Abstract

ABSTRACT.We assessed the impact of genetic divergence and the ability to combine corn hybrids used for the production of silage on the agronomic and bromatological traits of silage quality. We evaluated 18 corn hybrids used as genitors in a circulant diallel scheme in which each genitor hybrid participated in 9 hybrid combinations, and evaluated 100 treatments [18 genitor hybrids, 81 diallelic hybrids, and a commercial check hybrid (DKB330)] in a triple lattice 10 x 10 experimental design in two environments in Brazil. Genetic variability 2 E. Gralak et al.Genetics and Molecular Research 16 (2): gmr16029643 was adequate among the corn silage hybrids, and we can recommend the use of genitors 2B688 and P30B39 for the formation of a base population for intrapopulational breeding. The P30P34 hybrid is the best for intrapopulational breeding when aiming for silage with high protein content, low fiber content, and higher in vitro digestibility. Interpopulational breeding directed at improving silage digestibility can use a combination of genitors P30P34 and AS1572, but AS1572 and P30K64 are the most recommended. Hybrids 2B688, P30P34, and SG6015 are considered the most genetically distant of the others hybrids, and have desirable combining potential; therefore, they are important genitors for the formation of new segregated populations for improving corn silage.

In Silico Analysis of Structural Photosynthetic Genes of Arabidopsis thaliana for Unique Mirror Repeats

“…The DNA code is the template which directs the organization and function of a complete organism by directing synthesis of range of macromolecules (1,2) . Repetitive DNA sequences gradually gets accumulated into the genomes during the course of evolution because of non-repairable variations arising from events like mutations, slipped strand mispairing and unequal crossing (3,4) . The term repetitive DNA sequences collectively represent the DNA fragments which are present in multiple copies into the genomes (5) .…”

Selection of S3 progenies of forage maize based on topcrosses with different testers

“…Genetic variability related to forage yield and quality is a premise for the success of maize-forage breeding programs (Guerrero et al, 2014). Gralak et al (2017) reported the existence of variability in commercial hybrids regarding the quality of forage, and Barrière et al (2010) showed that superior genotypes could be selected from already improved ones. Despite this variability, breeding programs have mainly focused on genotypes with high grain and dry matter yields.…”