Experimental hybridisation of Brassica species in New Zealand

P. B. Heenan*, M. I. Dawson, R. G. Fitzjohn, A. V. Stewart

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    Field hybridisation experiments are described in which B. juncea, B. napus, and B. oleracea were crossed with B. napus (male), and B. napus was crossed with B. juncea (male). Five of the experiments used chlorsulfuron herbicide-resistant B. napus as the paternal parent, allowing over 98 000 seeds to be easily and efficiently screened for chlorsulfuron resistance to detect hybrid progeny. Two experiments used leaf morphological characters to identify putative hybrids. Intraspecific B. napus crosses produced low percentages (1.83% and 1.79%) of hybrid progeny. Brassica juncea x B. napus interspecific crosses produced on average 2.1% hybrids, and the B. napus x B. juncea cross produced 0.2% hybrids. No hybrids were detected by chlorsulfuron resistance in the B. oleracea x B. napus cross. Fecundity of the F1 hybrid plants in all of the crosses was low compared with their parents, with hybrids having less than 28% pollen stainability and producing less than 2.4 seeds per flower pollinated when selfed or backcrossed; most of the F1 hybrids studied produced less than one seed per flower pollinated. These results show that low levels of hybridisation and gene transfer between B. napus and some relatives could occur in New Zealand when grown in close proximity.

    Original languageEnglish
    Pages (from-to)53-66
    Number of pages14
    JournalNew Zealand Journal of Botany
    Volume45
    Issue number1
    Publication statusPublished - Mar 2007

    Keywords

    • B. juncea
    • B. napus
    • B. oleracea
    • Brassica
    • Brassicaceae
    • Chlorsulfuron
    • Gene flow
    • Hybrids
    • New Zealand

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