Sentence examples for an ovule from inspiring English sources

A similar process is apomixis, the development of an ovule into a seed without fertilization.

Because it is multicellular, the pollen grain is considered to be an immature male gametophyte, but its further development into a sexually mature organism occurs only after it has been shed from the microsporangium and transported as a pollen grain to a megasporophyll specifically, to an ovule, within which the male gametophyte grows to maturity.

Though sometimes quite distinct, the carpels are most often united in a 3-chambered female structure (pistil) in which each chamber may contain an ovule or in which 1 or 2 chambers may be reduced or apparently lacking, the pistil then appearing to be 2-chambered or single-chambered.

In flowering plants, a successful fertilization event results in seed formation in which an ovule becomes a seed, the egg cell becomes a zygote, the central cell forms the endosperm, and the integuments develop into the seed coat.

The growth-site at the pollen tube tip responds to signalling processes to successfully steer the tube to an ovule.

In Angiosperms (the flowering plants) the pollen tube can traverse up to 30 centimetres of pistil tissue before encountering an ovule.

Taken all together, the placenta in angiosperm is most logically derived from an ovule-bearing shoot with an amphicribral bundle.

The Unifying Theory, a hypothesis founded on a Jurassic plant with free central placentation, dissects a carpel into an ovule-bearing shoot (placenta) and its enclosing foliar structure (Wang 2010).

Parthenocarpy has been obtained in eggplant by genetic engineering using a chimeric gene and an ovule-specific promoter which allows the plant to increase the content and/or the activity of indol-3-acetic acid.

This observation in conjunction with data from other fields concurrently suggests that the ovary wall is equivalent to a foliar organ whereas the placenta represents an ovule-bearing shoot.

It is interesting that the above inconsistencies will disappear when our interpretation is adopted: a placenta is an ovule-bearing branch with an amphicribral bundle that may branch freely and fuse with any parts of carpel wall, including ventral, dorsal veins, or somewhere in between.