POST-FERTILIZATION BARRIERS IN INTERSPECIFIC CROSSES BETWEEN NIEREMBERGIA LINARIAEFOLIA AND N. ERICOIDES
In the present study we report the interspecific compatibility as a breeding tool to produce novel ornamental varieties in Nierembergia. Two species were used in reciprocal crosses, N. ericoides and N. linariaefolia. Interspecific crosses were carried out in spring. Ovary development, seed set for fruit and preliminary embryo development study was evaluated. Ovary showed normal development, when N. linariaefolia was used as pollen donor, and no significant differences in seed number were found with the control (N. ericoides × N. scoparia). Unlike, when N. ericoides was used as pollen donor, ovary carried on growing until 5 DPP (Day Post Pollination). Embryo development study revealed the normal gamete fusion, but zygote abortions were observed at 6 DPP in both reciprocal crosses. The result showed the incompatibility is caused by post-fertilization barriers. In addition, different characteristics in failure seed were observed, through embryo development study, between the reciprocal crosses.
Soto, S., Bullrich, L., Bologna , P., Facciuto , G. and Borja , M. (2012). POST-FERTILIZATION BARRIERS IN INTERSPECIFIC CROSSES BETWEEN NIEREMBERGIA LINARIAEFOLIA AND N. ERICOIDES. Acta Hortic. 937, 947-952
embryo development, zygote abortion, post-zygotic barriers, interspecific incompatibility