Featured Research

from universities, journals, and other organizations

Sugar influences the onset of flowering: Only when light, age and energy conditions are right do plants flower

Date:
February 7, 2013
Source:
Max-Planck-Gesellschaft
Summary:
Only when light, age and energy conditions are right do plants flower. A plant can reproduce successfully only if it flowers at the appropriate time. Therefore, a complex network of photoreceptors and other proteins has evolved to monitor environmental conditions such as light and temperature.

In experiments in Arabidopsis thaliana, the team found that the sugar molecule trehalose-6-phosphate influences the onset of flowering.
Credit: Josef Bergstein/ MPI-MP

Only when light, age and energy conditions are right do plants flower.

A plant can reproduce successfully only if it flowers at the appropriate time. Therefore, a complex network of photoreceptors and other proteins has evolved to monitor environmental conditions such as light and temperature. It has long been thought that plants must also ensure that they have sufficient resources for the energy intensive process of building flowers. As scientists from the Max Planck Institute of Molecular Plant Physiology in Potsdam and the Max Planck Institute for Developmental Biology in Tόbingen now report, the sugar molecule trehalose-6-phosphate (T6P) takes on a key role in monitoring energy reserves in thale cress, Arabidopsis thaliana, thereby controlling flowering time in relation to energy reserves.

Day length is critical for regulating flowering time in a wide range of species. Some plants need long days and thus flower in summer, while others need short days and accordingly flower in spring or autumn. When the appropriate day length is perceived in leaves, an interplay of photoreceptors and other proteins leads to expression of the FLOWERING LOCUS T (FT) gene. The FT protein then migrates to the tip of the shoot, where it triggers the formation of flowers instead of leaves.

However, once it reaches a certain age, thale cress produces flowers independently of day length. This safety mechanism is controlled by a specific microRNA, serving as a redundant pathway ensuring eventual flowering.

In addition to light and age, the energy status is also thought to have an influence on flowering time. The formation of flowers is an energy-intensive process, and this energy must be available to the plant in the form of sugar. How sugar molecules might help determine the onset of flowering has long been unknown. Now researchers from the Max Planck Institute of Molecular Plant Physiology and the Max Planck Institute for Developmental Biology report that the sugar molecule T6P influences both signalling pathways described above.

"Since plants contain only minute amounts of T6P, it has been suspected that it could be a signalling molecule," explains Vanessa Wahl, lead author of the paper. "However, until now nobody knew how T6P interacted with the complex genetic network that regulates the onset of flowering." By blocking the production of T6P, Wahl and her colleagues could delay flowering and in extreme cases stop it altogether. This held true even when the plants were grown under highly inductive conditions. "We were able to show that this sugar is indispensable for the production of the FT protein in the leaves," adds corresponding author Markus Schmid, "and, as we know, flowering without FT is greatly delayed."

In addition, T6P influences both the production of the age pathway microRNA and the expression of its target genes. This means that this sugar molecule regulates two of the most important pathways that control the onset of flowering.

"Even though it was clear that the plant had to check its energy levels before flowering started, there was no explanation about how that could work at the molecular level," Vanessa Wahl describes. In revealing the molecular links between flowering time and sugar status, this stands as an important contribution to our understanding of the complex network that regulates flowering.


Story Source:

The above story is based on materials provided by Max-Planck-Gesellschaft. Note: Materials may be edited for content and length.


Journal Reference:

  1. V. Wahl, J. Ponnu, A. Schlereth, S. Arrivault, T. Langenecker, A. Franke, R. Feil, J. E. Lunn, M. Stitt, M. Schmid. Regulation of Flowering by Trehalose-6-Phosphate Signaling in Arabidopsis thaliana. Science, 2013; 339 (6120): 704 DOI: 10.1126/science.1230406

Cite This Page:

Max-Planck-Gesellschaft. "Sugar influences the onset of flowering: Only when light, age and energy conditions are right do plants flower." ScienceDaily. ScienceDaily, 7 February 2013. <www.sciencedaily.com/releases/2013/02/130207141411.htm>.
Max-Planck-Gesellschaft. (2013, February 7). Sugar influences the onset of flowering: Only when light, age and energy conditions are right do plants flower. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2013/02/130207141411.htm
Max-Planck-Gesellschaft. "Sugar influences the onset of flowering: Only when light, age and energy conditions are right do plants flower." ScienceDaily. www.sciencedaily.com/releases/2013/02/130207141411.htm (accessed September 20, 2014).

Share This



More Plants & Animals News

Saturday, September 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: San Diego Zoo Welcomes Cheetah Cubs

Raw: San Diego Zoo Welcomes Cheetah Cubs

AP (Sep. 20, 2014) — The San Diego Zoo has welcomed two Cheetah cubs to its Safari Park. The nearly three-week-old female cubs are being hand fed and are receiving around the clock care. (Sept. 20) Video provided by AP
Powered by NewsLook.com
Chocolate Museum Opens in Brussels

Chocolate Museum Opens in Brussels

AFP (Sep. 19, 2014) — Considered a "national heritage" in Belgium, chocolate now has a new museum in Brussels. In a former chocolate factory, visitors to the permanent exhibition spaces, workshops and tastings can discover derivatives of the cocoa bean. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) — The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) — A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins