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Reproduction in the new zealand taxa of pomaderris rhamnaceae



Reproduction in the new zealand taxa of pomaderris rhamnaceae



New Zealand Journal of Botany 23(1): 151-156



The diploid, P. kumerako (2n = 24), is self fertile and reproduces sexually, whereas 2 triploid taxa, P. hamiltonii and P. phylicifolia var. ericifolia reproduce by agamospermy. The origin of the embryo sac in the latter is diplosporous. Although breeding experiments indicate that pollination improves seed set, endosperm chromosome counts in P. hamiltonii show that fertilization of the endosperm nucleus does not occur. Endosperm is derived from one or both polar nuclei separately. In the tetraploid P. phylicifolia var. polifolia, reproduction is mainly sexual, but there is some indication that plants may be facultative apomicts.

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