• Reproductive versatility inRubus - I. morphology and inheritance

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    • Abstract

       

      1. The reproductive behaviour of a number of species and varieties ofRubus has been investigated.

      2. Diploid species always behave sexually. Occasional unreduced germ-cells occur and take part in fertilization, giving rise to polyploid forms.

      3. In polyploid forms and species reproduction may be entirely sexual, entirely non-sexual or partly sexual and partly non-sexual (apomictic).

      4. Polyploid species vary in the degree to which apomixis is developed, and a particular species may show a variation in reproductive behaviour depending on the species used as male in cross-pollination.

      5. Segregation has been found to occur within non-sexual offspring. Hence test crosses, in conjunction with cytological and embryological studies, are necessary to determine the precise mode of reproduction.

      6. The results are discussed in relation to the difficult taxonomy ofRubus.

    • Author Affiliations

       

      M. B. Crane1

      1. John Innes Horticultural Institution, Merton
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  • Journal of Genetics | News

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