František Krahulec

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Neither the genetic basis nor the inheritance of apomixis is fully understood in plants. The present study is focused on the inheritance of parthenogenesis, one of the basic elements of apomixis, in Pilosella (Asteraceae). A complex pattern of inheritance was recorded in the segregating F1 progeny recovered from reciprocal crosses between the facultatively(More)
We traced hybridization processes taking place within a mixed population of Pilosella piloselloides subsp. bauhini and P. officinarum by means of a morphometric analysis of plants sampled in the field. Our results show that hybridization is frequent between the two taxa as well as between their two stabilized hybrids (P. brachiata and P. leptophyton).(More)
The effect of maternal, facultatively apomictic plants on population diversity was evaluated in seven hybridizing polyploid Pilosella populations, where apomictic (P. bauhini or P. aurantiaca) and sexual (P. officinarum) biotypes coexist. The ploidy level, reproductive system, morphology, clonal structure and chloroplast DNA haplotypes were used to(More)
Tragopogon ×mirabilis Rouy is described as a diploid hybrid between T. porrifolius and T. pratensis. A population of T. ×mirabilis from Central Bohemia, Czech Republic, was recently investigated and, unlike previous reports of T. ×mirabilis, was found to be highly fertile. This fertile diploid hybrid population was considered to represent an alternative(More)
We studied the significance of sexual reproduction as a source of ploidy level variation in a model system consisting of hexaploid, facultatively apomictic Pilosella bauhini and tetraploid, sexual P. officinarum. As the maternal parent, apomictic P. bauhini generated higher ploidy level variation than sexual P. officinarum. Ploidy levels of its progeny(More)
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