Navigation Links
Hormone clue to root growth
Date:7/7/2009

Plant roots provide the crops we eat with water, nutrients and anchorage. Understanding how roots grow and how hormones control that growth is crucial to improving crop yields, which will be necessary to address food security and produce better biofuels.

Now an international group of scientists, led by the Centre for Plant Integrative Biology at The University of Nottingham, has shed light on how a plant hormone is crucial in controlling the growth of plant roots.

Plant growth is driven by an increase in two factors: the number of cells, and their size. It is already known that the plant hormone gibberellin controls how root cells elongate as the root grows in the model plant Arabidopsis thaliana. Now a paper appearing in Current Biology describes for first time how this hormone also regulates the number of cells in the root in order to control root growth.

Gibberellin normally acts by signaling the removal of proteins which repress growth, and so promotes root cell production. The new research shows that mutant plants that do not produce gibberellin are unable to increase their cell production rate and the size of the root meristem, the zone of cell proliferation.

Plants in which the cells in the meristem were made to express a mutant version of the growth-repressing protein GAI not degraded by gibberellin showed disrupted cell proliferation. Expressing this mutant form, gai, in only one tissue, the endodermis (the innermost layer of the root cortex of a plant), was sufficient to stop the meristem enlarging. In effect, the rate of expansion of dividing endodermal cells dictates the equivalent rate in other tissues.

This research was headed by Dr Susana Ubeda-Toms and Professor Malcolm Bennett of the Centre for Plant Integrative Biology, in collaboration with scientists in Nottingham, Cambridge, Edinburgh, Spain, Belgium and Sweden.

Professor Malcolm Bennett, Biology Director for the Centre for Plant Integrative Biology and Professor of Plant Sciences in the Division of Plant and Crop Sciences, said: "We have shown that gibberellin plays a crucial role in controlling the size of the root meristem, and that it is the endodermis which sets the pace for expansion rates in the other tissues.

"Understanding precisely how hormones regulate plant growth is one of the key areas of fundamental plant biology which will underpin crop improvements in the future."

The Centre for Plant Integrative Biology (CPIB) is funded by the Systems Biology joint initiative of BBSRC and EPSRC, which has provided 27 million for six specialised centres across the UK.

The Division of Plant and Crop Sciences at The University of Nottingham is one of the largest communities of plant scientists in the UK. Around 160 people work in the Division, which welcomes visiting scientists from all over the world, reinforcing its reputation as a world renowned centre.


'/>"/>

Contact: Dr Susannah Lydon
susannah.lydon@nottingham.ac.uk
44-011-595-16289
University of Nottingham
Source:Eurekalert

Related biology news :

1. Lack of happiness hormone serotonin in the brain causes impaired maternal behavior in mice
2. Fatty foods -- not empty stomach -- fire up hunger hormone
3. Hormone-mimics in plastic water bottles -- just the tip of the iceberg?
4. Pregnancy hormone predicts postpartum depression
5. Protein that regulates hormones critical to womens health found in pituitary
6. Hormone therapy associated with reduced colorectal cancer risk
7. Food can affect a cell in the same way hormones do
8. Children distressed by family fighting have higher stress hormones
9. Apelin hormone injections powerfully lower blood sugar
10. Birth control has long-term effect on hormone exposure
11. Sex hormones link to heart risk
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/3/2016)... February 3, 2016 --> ... research report "Automated Fingerprint Identification System Market by Component ... Application (Banking & Finance, Government, Healthcare, and Transportation) and ... the market is expected to be worth USD 8.49 ... between 2015 and 2020. The transformation and technology evolution ...
(Date:2/2/2016)... 2016 This BCC Research report provides ... reviewing the recent advances in high throughput ‘omic ... field forward. Includes forecast through 2019. ... and opportunities that exist in the bioinformatic market. ... as well as IT and bioinformatics service providers. ...
(Date:2/2/2016)... 2016  Based on its recent analysis of ... US-based Intelligent Retinal Imaging Systems (IRIS) with the ... New Product Innovation. IRIS, a prominent cloud-based retinal ... , is poised to set the new ... market. The IRIS technology presents superior price-performance value ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... -- Early-career researchers from Indonesia ... Uganda and Yemen ...   Indonesia , Nepal , ... Yemen are being honored for their accomplishments in nutrition, ... for mentoring young women scientists who are pursuing careers in agriculture, biology ...
(Date:2/10/2016)... and New York, New York (PRWEB) , ... ... ... Regeneron Pharmaceuticals Inc. (NASDAQ: REGN) today announced that it has joined ... new vaccines and immunotherapies for infectious diseases and cancer. , The ...
(Date:2/10/2016)... , ... February 10, 2016 , ... ... three states, announced today the promotion of two long-standing principal investigators (PI) to ... Family Medicine, Clinical Research and Development. , Dr. Laurence Chu, a Benchmark Research ...
(Date:2/10/2016)... CA (PRWEB) , ... February 10, 2016 , ... ... Multiplex Testing (PROMPT), a research registry built on the secure online PatientCrossroads platform, ... 2014. More than 1,600 participants have joined the PROMPT study, which seeks to ...
Breaking Biology Technology: