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11 sty 2021 · The ovule and its developmental successor, the seed, together represent arguably the most significant innovation of seed plants because they represent a developmentally dynamic structure that facilitates an efficient means of reproduction and dispersal in a variety of habitats.
Ovule initiation determines the maximal possibility of ovule number per flower and greatly influences the seed number per fruit in plants characterized by multi-ovulate ovaries, even affecting fruit size, which makes ovule number an important agronomic trait.
In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center.
The ovule is the site of megagametogenesis and fertilization and hence is of central importance to sexual reproduction in seed plants. In recent years, the ovule has become established as an excellent model system in which to study organogenesis.
17 cze 2021 · Small RNAs are highly abundant during female reproductive development in B. rapa, and the majority of small RNAs originate from a small number of loci (Grover et al. 2020): these siren siRNAs are present in ovules, seed coats, embryos and endosperm (Grover et al. 2020).
Ovule, plant structure that develops into a seed when fertilized. A mature ovule consists of a food tissue covered by one or two future seed coats, known as integuments. The ovules of angiosperms are enclosed by an ovary, while those of gymnosperms are uncovered on the scales of a cone.
Locules are chambers within the ovary of the flower and fruits. The locules contain the ovules (seeds), and may or may not be filled with fruit flesh. Depending on the number of locules in the ovary, fruits can be classified as uni-locular (unilocular), bi-locular, tri-locular or multi-locular.
