Abstract
Facultative autonomous apomictic seed formation has been identified in Coprosma robusta by flow cytometry. Twenty‐one (84%) of the plants sampled produced some seeds with an embryo‐to‐endosperm ploidy ratio (2:4) consistent with autonomous embryo development from a single unreduced egg nucleus, and autonomous endosperm development from two unreduced polar nuclei. The average number of apomictic seeds produced in the population was about 15%. Remaining seeds have an embryo‐to‐endosperm ploidy ratio of 2:3, consistent with sexual reproduction. Dissections of individual apomictic seeds confirmed that the 4C peak occurs in the endosperm, the 2C peak in the embryo. In sexually derived seeds the embryo has a 2C peak and the endosperm is multiploid with 3C and 6C. In both apomictic and sexual seeds the woody endocarp has 2C and 4C peaks.
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