Navigation Links
Plant cell architecture: Growth toward a light source
Date:11/7/2013

Stanford, CAInside every plant cell, a cytoskeleton provides an interior scaffolding to direct construction of the cell's walls, and thus the growth of the organism as a whole. Environmental and hormonal signals that modulate cell growth cause reorganization of this scaffolding. New research led by Carnegie's David Ehrhardt provides surprising evidence as to how this reorganization process works, with important evidence as to how the direction of a light source influences a plant's growth pattern. It is published by Science Express.

The cytoskeleton undergirding each cell includes an array of tubule-shaped protein fibers called microtubules. By directing cell growth and development, this scaffold is crucial for supporting important plant functions such as photosynthesis, nutrient gathering, and reproduction.

The cytoskeleton does not appear to be remodeled by moving these microtubules around in the cell. Rather, it is altered by changes to the way these fiber arrays are assembled or disassembled. Ehrhardt's team--including lead author Jelmer Lindeboom, Masayoshi Nakamura, Ryan Gutierrez and Viktor Kirik, all from Carnegie--used advanced tools to watch the reorganization process of these microtubule arrays under different conditions.

These imaging data, combined with the results of genetic experiments, revealed a mechanism by which plants orient microtubule arrays. A protein called katanin drives this mechanism, which it achieves by redirecting microtubule growth in response to blue light. It does so by severing the microtubules where they intersect with each other, creating new ends that can regrow and themselves be severed, resulting in a rapid amplification of new microtubules lying in another, more desired, direction.

"Our genetic data, together with previous studies that tie microtubule organization to cell growth, indicate that this restructuring is required for the plant to bend toward a light source as it grows, a phenomenon called phototropism," Ehrhardt explained. "Our findings also have broader implications for the construction of cytoskeletons in other types of cells, including human cells, because katanin is conserved between animals and plants."

"This is exceptional work, which draws upon decades of pioneering discoveries made by Carnegie's Winslow Briggs on blue light perception. For the first time Ehrhhardt's group demonstrates how blue light drives changes in cytoskeleton organization, which underlies the architecture and mechanical properties of the cell walls. These properties are critical for the light-induced bending" says Wolf B. Frommer, Director of the department. He terms the study: "fantastic work, a milestone in the history of blue light research."


'/>"/>

Contact: David Ehrhardt
ehrhardt@stanford.edu
650-325-1521 x261
Carnegie Institution
Source:Eurekalert

Related biology news :

1. The future of plant science - a technology perspective
2. The future of plant science a technology perspective
3. Bone marrow transplant arrests symptoms in model of Rett syndrome
4. American Society of Plant Biologists honors early career women scientists
5. Not just for the birds: Man-made noise has ripple effects on plants, too
6. Plant DNA speaks English, identifies new species
7. Human noise has ripple effects on plants
8. New databases harvest a rich bounty of information on crop plant metabolism
9. Plant research reveals new role for gene silencing protein
10. Plants mimic scent of pollinating beetles
11. Stomata development in plants unraveled -- a valuable discovery for environmental research
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/9/2016)... attendance control systems is proud to announce the introduction of fingerprint attendance control software, ... employees are actually signing in, and to even control the opening of doors. ... ... ... Photo - http://photos.prnewswire.com/prnh/20160609/377487 ...
(Date:6/2/2016)... , June 2, 2016 The Department ... has awarded the 44 million US Dollar project, for the ... Vehicle Plates including Personalization, Enrolment, and IT Infrastructure , ... in the production and implementation of Identity Management Solutions. Numerous ... however Decatur was selected for the ...
(Date:5/24/2016)... 2016 Ampronix facilitates superior patient care by providing unparalleled technology to leaders ... is the latest premium product recently added to the range of products distributed by ... ... ... LCD Medical Display- Ampronix News ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... ... 2016 , ... Researchers at the Universita Politecnica delle Marche in Ancona combed ... pleural mesothelioma. Their findings are the subject of a new article on the Surviving ... signposts in the blood, lung fluid or tissue of mesothelioma patients that can help ...
(Date:6/23/2016)... , June 23, 2016 A person commits a ... crime scene to track the criminal down. An ... Food and Drug Administration (FDA) uses DNA evidence to track ... Sound far-fetched? It,s not. The FDA has increasingly ... support investigations of foodborne illnesses. Put as simply as possible, ...
(Date:6/23/2016)...   EpiBiome , a precision microbiome engineering company, ... financing from Silicon Valley Bank (SVB). The financing will ... its drug development efforts, as well as purchase additional ... has been an incredible strategic partner to us – ... would provide," said Dr. Aeron Tynes Hammack , ...
(Date:6/23/2016)... 23, 2016  Blueprint Bio, a company dedicated to ... medical community, has closed its Series A funding round, ... "We have received a commitment from Forentis ... need to meet our current goals," stated Matthew ... runway to complete validation on the current projects in ...
Breaking Biology Technology: