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Sexual tetraploid and apomictic pentaploid populations ofHieracium pilosella (Compositae)

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Abstract

Five species are recognized inHieracium subgen.Pilosella sect.Pilosellina Fries. Four are diploid (2x, 2n = 18), one (H. pilosella L.) is highly variable morphologically and cytologically (from 2x to 10x), in its mode of reproduction (self-incompatibility, agamospermy, amphimixis, apo-amphimixis) and in its hybridization pattern. A part of this huge agamic complex was analysed by comparing sexual 4x and apomictic 5x plants (crossing and germination experiments, measurements of vegetative reproduction by stolons etc.). In the experimental garden apomictic 5x produced more stolons than the sexual 4x plants and the total length of the stolons per rosette was greater. However, in nature, the competitive potential of the sexual plants seems to be higher, presumably as a result of the higher mortality of ramets in 5x. Sexual 4x plants often grow in dense and grazed grass vegetation, whereas 5x apomicts often occur in dunes with patchy vegetation. Apomicts produce more capitula per rosette, and sexual rosettes form only about 60% of the number of viable achenes as compared to apomictic ones. Therefore, apomicts appear to be characterized by a greater colonizing ability than sexual plants. Apomictic plants produce equal numbers of viable achenes under conditions of both open pollination and isolation. Sexual plants do not form any viable achenes after isolation and produce a somewhat lower percentage of achenes after open pollination than do apomictics. 5xreproduce exclusively apomictically. Apo-amphimixis was never observed in pentaploids and only very rarely in tetraploids. Addition hybrids are very rare. The cross sexual 4x × apomictic 5x failed in 70% of the attempts, but the recombination of genomes carrying genes for apomixis is possible and results in apomictic 4x and sexual 5x, both with a reduced number of viable achenes. In nature sexual and apomictic plants may occur in close proximity. In such cases the germination rate of the achenes of 4x and 5x is lower; this may indicate that apomictic plants fertilize sexual plants in nature (unidirectional gene-flow). 5x plants form euploid gametes carrying two or three genomes. The results of the crossing experiments can be explained in terms ofNogler's theory of monogenic inheritance of apospory.

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  1. Vakgroep Populatie en Evolutiebiologie, Department of Biosystematics, State University Utrecht, Transitorium III, Padualaan 8, NL-3584, Utrecht, CH, The Netherlands

    T. W. J. Gadella

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Variation and evolution inHieracium subg.Pilosella sect.Pilosellina I.

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Gadella, T.W.J. Sexual tetraploid and apomictic pentaploid populations ofHieracium pilosella (Compositae). Pl Syst Evol 157, 219–245 (1987). https://doi.org/10.1007/BF00936199

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