Abstract

A series of intra- and interspecific crosses in Rubus was evaluated with DNA markers to assess the proportion of apomictically vs. sexually derived progeny plants. The species were well separated from each other with these markers and the interspecific hybrids were easy to ascertain. Ten plants each were derived by selfing of R. hartmanni, R. polyanthemus and R. vestitus, and evaluated with RFLP. Of these plants, only one R. hartmanni plant appeared to be sexually derived, whereas the remainder appeared to have arisen by apomixis. Between 10 and 19 progeny plants, derived by open pollination of R. hartmanni, R. infestus, R. laciniatus and R. vestitus, respectively (total of 63 plants), were evaluated with RFLP. Of these, 6 plants (approx. 10%) showed a slightly deviating band pattern, which may indicate sexual seed set but could also result from experimental artefacts. The three species combinations 1) R. hartmanni and R. sprengelii, 2) R. infestus and R. vestitus, and 3) R. laciniatus and R. polyanthennis were cross-pollinated reciprocally and the resulting progenies evaluated with RAPD (combinations 1 and 2) and leaf shape (combination 3). Combination 1 produced 20% (3 out of 15 progenies) sexually derived progenies, combination 2 produced 100% (26 progenies) and combination 3 produced 64% (16 out of 26 progenies), respectively. The hybrid progenies appeared to have been derived through pollination of unreduced as well as reduced egg cells. The ability to produce interspecific hybrid progenies is most probably dependent upon the species combination

Published in

Euphytica
2003, Volume: 133, number: 1, pages: 71-80
Publisher: KLUWER ACADEMIC PUBL

SLU Authors

• Nybom, Hilde

  • Department of Crop Science, Swedish University of Agricultural Sciences
    

• Werlemark, Gun

  • Department of Crop Science, Swedish University of Agricultural Sciences
    

Publication identifier

DOI: https://doi.org/10.1023/A:1025674128000

Permanent link to this page (URI)

https://res.slu.se/id/publ/1362