Autori: Lucica Mihalte, Radu E. Sestras
Editorial: SpringerLink, Euphytica DOI: 10.1007/s10681-011-0597-5, 2011.
The main characteristics (plant diameter, number of spine/areoles and length of spines) of 16 cactus hybrids were analysed and the genetic variability and broad-sense heritability was studied. The descendants were obtained through a cyclic cross-pollination pattern, with the parental forms chosen based on aesthetic considerations. Cross-pollination among Rebutia senilis × Aylostera muscula, Rebutia tarvitaensis × Aylostera muscula, Aylostera flavistyla × Rebutia senilis, Rebutia senilis × Aylostera flavistyla, Aylostera muscula × Aylostera albiflora and Rebutia senilis × Aylostera albiflora did not succeed, whereas all of the other hand-pollinated crosses succeeded and produced viable seeds. The highest values of the analysed characters were observed in the progeny of A. fiebrigii var. densiseta × R. senilis and A. buiningiana × A. vallegardensis and the artificial selection to identify plants with special decorative traits was extremely efficient among them. In the F1 population of the studied crosses, a large genetic diversity was found within hybrid combinations (families), between combinations and a different variation was recorded among the analysed traits. The broad-sense heritability ranged between 0.909 (plant diameter) and 0.948 (spines length). All of the characters analysed, in the present experience, have a strong genetic determinism, being greatly influenced by the genotype and to a lesser extent, by the cultivation conditions (greenhouse).
Cuvinte cheie: cactaceae, hibrizi F1, hibridare interspecifica, hibridare intergenerica, diversitate genetica // Cactaceae, F1 hybrids, interspecific hybridisation, inter-generic hybridisation, genetic diversity