| Title |
Altered gravitropic response, amyloplast sedimentation and circumnutation in the Arabidopsisshoot gravitropism 5 mutant are associated with reduced starch levels
|
|---|---|
| Published in |
Plant Molecular Biology, February 2008
|
| DOI | 10.1007/s11103-008-9301-0 |
| Pubmed ID | |
| Authors |
Mimi Tanimoto, Reynald Tremblay, Joseph Colasanti |
| Abstract |
Plants have developed sophisticated gravity sensing mechanisms to interpret environmental signals that are vital for optimum plant growth. Loss of SHOOT GRAVITROPISM 5 (SGR5) gene function has been shown to affect the gravitropic response of Arabidopsis inflorescence stems. SGR5 is a member of the INDETERMINATE DOMAIN (IDD) zinc finger protein family of putative transcription factors. As part of an ongoing functional analysis of Arabidopsis IDD genes (AtIDD) we have extended the characterisation of SGR5, and show that gravity sensing amyloplasts in the shoot endodermis of sgr5 mutants sediment more slowly than wild type, suggesting a defect in gravity perception. This is correlated with lower amyloplast starch levels, which may account for the reduced gravitropic sensitivity in sgr5. Further, we find that sgr5 mutants have a severely attenuated stem circumnutation movement typified by a reduced amplitude and an decreased periodicity. adg1-1 and sex1-1 mutants, which contain no starch or increased starch, respectively, also show alterations in the amplitude and period of circumnutation. Together these results suggest that plant growth movement may depend on starch levels and/or gravity sensing. Overall, we propose that loss of SGR5 regulatory activity affects starch accumulation in Arabidopsis shoot tissues and causes decreased sensitivity to gravity and diminished circumnutational movements. |
Mendeley readers
The data shown below were compiled from readership statistics for 84 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 1 | 1% |
| Unknown | 83 | 99% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 23 | 27% |
| Student > Ph. D. Student | 9 | 11% |
| Professor | 8 | 10% |
| Student > Bachelor | 7 | 8% |
| Professor > Associate Professor | 7 | 8% |
| Other | 15 | 18% |
| Unknown | 15 | 18% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 48 | 57% |
| Biochemistry, Genetics and Molecular Biology | 16 | 19% |
| Computer Science | 1 | 1% |
| Unknown | 19 | 23% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 02 December 2010.
All research outputs
#20,187,333
of 22,703,044 outputs
Outputs from Plant Molecular Biology
#2,619
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Outputs of similar age
#151,153
of 156,043 outputs
Outputs of similar age from Plant Molecular Biology
#6
of 6 outputs
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