科研之友
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摘要
Feijoa sellowiana Berg is cultivated as a non-timber forest tree in New Zealand, Colombia and France, and is well known for its high dietary value fruit. F. sellowiana was introduced into China during the 1980s. However, it is particularly prone to erratic fruit set and very little work has been conducted on its reproductive biology. F. sellowiana 'Mammoth' cultivar was subjected to a light microscopy analysis to clarify male and female gametogenesis. The results showed that the formation of anther wall conforms to the basic type. The tapetum is of the glandular type. Cytokinesis in microsporocyte meiosis is of simultaneous type, and the micropore tetrads are tetrahedral. Mature pollen grains are two-celled with three germ pores. The ovules are anatropous, bitegminous, and tenuinucellate. The megaspore tetrads are arranged linearly, and the megaspore at the chalazal end is functional. The functional megaspore undergoes three successive mitoses resulting in the formation of an 8-nucleate embryo sac of the Polygonum type. Our results elucidate the mechanism that regulates sexual reproduction in F. sellowiana, thus expanding the prospects for F. sellowiana breeding programs and further molecular and genetic analyses of this species.
- 出版日期2016
- 单位中南大学
