Heterosis

Inbreeding depression in single, three way and double-cross hybrids of maize

F. B. S. Botelho, Bruzi, A. T., Lima, I. P., Rodrigues, C. S., Botelho, R. Tde C., Botelho, F. B. S., Bruzi, A. T., Lima, I. P., Rodrigues, C. S., and Botelho, R. Tde C., Inbreeding depression in single, three way and double-cross hybrids of maize, vol. 15, p. -, 2016.

Currently, one of the acclaimed alternatives for increasing maize yield is accomplished through utilization of heterosis in hybrid cultivars. However, upon performing crosses between related pairs, there are losses due to inbreeding depression. Thus, the aim of this study was to estimate inbreeding depression and the contribution of loci in heterozygosity in different types of maize hybrids. Eight treatments were evaluated, considering the F1 and S0 generations of four commercial hybrids.

Heterosis and correlation in interspecific and intraspecific hybrids of cotton

S. Munir, Hussain, S. B., Manzoor, H., Quereshi, M. K., Zubair, M., Nouman, W., Shehzad, A. N., Rasul, S., Manzoor, S. A., Munir, S., Hussain, S. B., Manzoor, H., Quereshi, M. K., Zubair, M., Nouman, W., Shehzad, A. N., Rasul, S., and Manzoor, S. A., Heterosis and correlation in interspecific and intraspecific hybrids of cotton, vol. 15, p. -, 2016.

Interspecific and intraspecific hybrids show varying degrees of heterosis for yield and yield components. Yield-component traits have complex genetic relationships with each other. To determine the relationship of yield-component traits and fiber traits with seed cotton yield, six lines (Bt. CIM-599, CIM-573, MNH-786, CIM-554, BH-167, and GIZA-7) and three test lines (MNH-886, V4, and CIM-557) were crossed in a line x tester mating design. Heterosis was observed for seed cotton yield, fiber traits, and for other yield-component traits.

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