Deep imaging reveals dynamics and signaling in one-to-one …
2024年5月21日 · A flower has one pistil in the center, which is formed by fusing the carpels. The fused carpels form two locules, which harbor around 20–30 ovules each in a vertical arrangement inside the locule. Merged region forms a septum harboring the placentae, from where a stalk-like structure funiculus connects each ovule.
Gynoecium - Wikipedia
The gynoecium is the innermost whorl of a flower; it consists of (one or more) pistils and is typically surrounded by the pollen -producing reproductive organs, the stamens, collectively called the androecium.
Feeling the pressure: A mechanical tale of the pollen tube journey ...
The pollen tube is a tip-growing cell that navigates thought the female tissues of the pistil to deliver the immobile sperm cells to the ovules. The pistil is a source of diffusible chemical attractants for the pollen tube (Mizuta and Higashiyama, 2018).
Integration of ovular signals and exocytosis of a Ca - Nature
2020年2月13日 · The single-celled pollen tubes in flowering plants grow invasively into the pistil and deliver the two sperm cells into the embryo sac embedded in the ovule.
The molecular and genetic basis of pollen–pistil interactions
2001年12月21日 · First of all, the growth path of wild-type pollen was examined microscopically. This revealed that in a situation where only limited numbers of pollen tubes grew down the transmitting tract, there was a strong preference to emerge on the surface of the septum at the position of the ovule closest to the stigma.
Cysteine-rich peptides promote interspecific genetic isolation in
2019年5月31日 · The role of AtLURE1s in reproductive isolation occurs at the septum emergence point in the pistil, which represents a critical step in the long journey of the pollen tube, as pollen tube emergence from the transmitting tract toward the funiculus surface usually results in successful sperm delivery.
Other mechanical transitions include the pollen tube emergence from the trans-mitting tract into the septum, its growth on the funiculus surface (which is open on the ovary cavity), and ultimately its entrance in the narrow micropyle (Figure 1).
Fig. 1. Pollen tube growth in the pistil. (A, B) Schematic...
The pollen germination and PT growth in the pistil involves a series of complicated cell-cell interactions; some facilitate PT navigation and fertilization, while others prohibit PT access to the...
Tip-localized receptors control pollen tube growth and LURE
2016年3月9日 · Here we show that tip-localized pollen-specific receptor-like kinase 6 (PRK6) with an extracellular leucine-rich repeat domain is an essential receptor for sensing of the LURE1 attractant peptide...
Pollen tube emergence is mediated by ovary-expressed …
2023年1月17日 · Pollen tube emergence as the transition phase between preovular and ovular guidance refers to the first re-orientation of pollen tubes extending from the transmitting tract to the septum surface...