Zea mays

Selection index based on the relative importance of traits and possibilities in breeding popcorn

R. A. Vieira, Rocha, R., Scapim, C. A., Júnior, A. T. Amaral, Vivas, M., Vieira, R. A., Rocha, R., Scapim, C. A., Júnior, A. T. Amaral, Vivas, M., Vieira, R. A., Rocha, R., Scapim, C. A., Júnior, A. T. Amaral, and Vivas, M., Selection index based on the relative importance of traits and possibilities in breeding popcorn, vol. 15, p. -, 2016.

One of the major difficulties faced by popcorn breeders is the negative correlation between popping expansion (PE) and grain yield (GY). It is necessary to overcome this difficulty to obtain promising genotypes. One helpful tool in this process is a selection index because it allows multiple features of interest to be selected. Thus, the present study proposes a new and comprehensive selection index applied in 169 half-sib families in UEM-Co1 and UEM-Co2 composites during two cycles of recurrent selection.

Analysis of gene expression patterns and levels in maize hybrids and their parents

H. S. Nie, Li, S. P., Shan, X. H., Wu, Y., Su, S. Z., Liu, H. K., Han, J. Y., and Yuan, Y. P., Analysis of gene expression patterns and levels in maize hybrids and their parents, vol. 14, pp. 15399-15411, 2015.

Heterosis has greatly contributed to conventional plant breeding and is widely used to increase crop plant productivity. However, although some studies have explored the mechanisms of heterosis at the genomic and transcriptome level, these mechanisms still remain unclear. The growth and development of maize seedlings and immature embryos have an important impact on subsequent production.

Effect of temperature on endogenous hormone levels and opposite phyllotaxy in maize leaf primordial

H. Ye, Han, G. M., Ma, Q., Tan, Y. Q., Jiang, H. Y., Zhu, S. W., and Cheng, B. J., Effect of temperature on endogenous hormone levels and opposite phyllotaxy in maize leaf primordial, vol. 14, pp. 17019-17027, 2015.

Newly identified maize (Zea mays) mutants with opposite leaf phyllotaxy are important in the study of the maize crop. Previous studies have revealed the developmental mechanism of opposite phyllotaxy on the physiological, cellular, and molecular levels. However, there have been few reports regarding the effects of changes in endogenous hormone levels in maize leaf primordia under different conditions. We conducted field studies to examine the influence of different environmental factors on leaf primordia differentiation.

Functional molecular markers (EST-SSR) in the full-sib reciprocal recurrent selection program of maize (Zea mays L.)

K. S. C. Galvão, Ramos, H. C. C., Santos, P. H. A. D., Entringer, G. C., Vettorazzi, J. C. F., and Pereira, M. G., Functional molecular markers (EST-SSR) in the full-sib reciprocal recurrent selection program of maize (Zea mays L.), vol. 14, pp. 7344-7355, 2015.

This study aimed to improve grain yield in the full-sib reciprocal recurrent selection program of maize from the North Flumi­nense State University. In the current phase of the program, the goal is to maintain, or even increase, the genetic variability within and among populations, in order to increase heterosis of the 13th cycle of reciprocal recurrent selection. Microsatellite expressed sequence tags (EST-SSRs) were used as a tool to assist the maximization step of genetic variability, targeting the functional genome.

Genetic diversity of popcorn genotypes using molecular analysis

F. S. Resh, Scapim, C. A., Mangolin, C. A., Machado, M. F. P. S., Amaral, Jr., A. Tdo, Ramos, H. C. C., and Vivas, M., Genetic diversity of popcorn genotypes using molecular analysis, vol. 14, pp. 9829-9840, 2015.

In this study, we analyzed dominant molecular markers to estimate the genetic divergence of 26 popcorn genotypes and evaluate whether using various dissimilarity coefficients with these dominant markers influences the results of cluster analysis. Fifteen random amplification of polymorphic DNA primers produced 157 amplified fragments, of which 65 were monomorphic and 92 were polymorphic. To calculate the genetic distances among the 26 genotypes, the complements of the Jaccard, Dice, and Rogers and Tanimoto similarity coefficients were used.

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