Pollen Tube Elongation
Pollen Tube Elongation - Related Videos
02:35
Transcription Elongation Factors
0 Views •
2020
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
02:35
Transcription Elongation Factors
0 Views •
2023
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
06:45
Live Imaging of Arabidopsis Pollen Tube Reception and Double Fertilization Using the Semi-In Vitro Cum Septum Method
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Cited by 4 •
2023
Here, we describe an improvement of the semi-in vitro (SIV) method for observing pollen tube guidance and reception in Arabidopsis thaliana, which increases the receptivity of ovules. The high-throughput SIV cum septum method may be coupled with gametophyte marker lines and genetically encoded biosensors to monitor the dynamic process of fertilization.
10:46
Novel Metrics to Characterize Embryonic Elongation of the Nematode Caenorhabditis elegans
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Cited by 3 •
2016
Here we detail protocols specifically designed to monitor morphogenic defects that occur during early and late phases of embryonic elongation of the nematode Caenorhabditis elegans. Ultimately, these protocols are designed to identify genes that regulate these phases and to characterize their differential requirements along the antero-posterior axis of the embryo.
06:34
A Component-resolved Diagnostic Approach for a Study on Grass Pollen Allergens in Chinese Southerners with Allergic Rhinitis and/or Asthma
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Cited by 4 •
2017
This work describes a protocol that uses a component-resolved approach to study sensitization to grass pollen allergens in a cohort of patients from southern China with allergic rhinitis and/or asthma.
FAQs
Polarized secretion concentrates vesicle delivery at the tube tip rather than distributing materials uniformly along the cell surface. Actin-mediated transport directs membrane and cell-wall components to this specialized growth region, allowing the tube to extend while maintaining its organized structure. This coordination links intracellular transport with the physical remodeling required for directional expansion.
A localized calcium gradient helps coordinate several events at the growing tip. It regulates vesicle fusion, influences cytoplasmic organization, and contributes to control of the growth rate. Because these functions occur in the same spatially restricted region, calcium signaling helps connect secretion and cellular organization with the changing pace of tube extension.
Actin-mediated transport supplies the growing tip with membrane and cell-wall materials, while cell-wall remodeling allows the extending tube to accommodate continued expansion. These processes address different requirements: the cytoskeleton organizes delivery inside the cell, and the wall changes at the boundary. Studying their coordination reveals how polarized plant cells sustain directional growth.
The process provides a tractable system for examining how a cell establishes and maintains a single active growth site. Researchers can relate tip-directed secretion, calcium-dependent regulation, cytoplasmic organization, and wall remodeling to the broader principles of polarity and signaling. This makes the pollen tube useful for connecting molecular events with developmental cell behavior.
Successful extension through reproductive tissues is linked to delivery of sperm cells to the ovule, so regulation of this growth has direct relevance to fertilization and seed formation. Investigating the process can therefore help clarify how plant reproductive development proceeds and how disruptions in tube growth may influence reproductive success.
Pollen tube elongation occurs within the context of interactions between pollen and pistil tissues. Examining how the tube progresses through those tissues provides a developmental framework for studying communication during reproduction and the factors associated with reproductive barriers. This connects cellular mechanisms such as signaling and wall remodeling to compatibility and fertility research in plants.