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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Thompson, Andrew J. Pogson, Barry J. Van Norman, Jaimie M. Bugg, Timothy D. H. Zhang, Jingyuan Harrison, Peter J. Chan, Kai Xun Cazzonelli, Christopher I. Benfey, Philip N. |
| Description | Author Affiliation: Van Norman JM ( Department of Biology, Duke Center for Systems Biology and Howard Hughes Medical Institute, Duke University, Durham, NC 27708.); |
| Abstract | In plants, continuous formation of lateral roots (LRs) facilitates efficient exploration of the soil environment. Roots can maximize developmental capacity in variable environmental conditions through establishment of sites competent to form LRs. This LR prepattern is established by a periodic oscillation in gene expression near the root tip. The spatial distribution of competent (prebranch) sites results from the interplay between this periodic process and primary root growth; yet, much about this oscillatory process and the formation of prebranch sites remains unknown. We find that disruption of carotenoid biosynthesis results in seedlings with very few LRs. Carotenoids are further required for the output of the LR clock because inhibition of carotenoid synthesis also results in fewer sites competent to form LRs. Genetic analyses and a carotenoid cleavage inhibitor indicate that an apocarotenoid, distinct from abscisic acid or strigolactone, is specifically required for LR formation. Expression of a key carotenoid biosynthesis gene occurs in a spatially specific pattern along the root's axis, suggesting spatial regulation of carotenoid synthesis. These results indicate that developmental prepatterning of LRs requires an uncharacterized carotenoid-derived molecule. We propose that this molecule functions non-cell-autonomously in establishment of the LR prepattern. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 13 |
| Volume Number | 111 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2014-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Arabidopsis Growth & Development Metabolism Carotenoids Biosynthesis Plant Roots Abscisic Acid Pharmacology Drug Effects Genetics Arabidopsis Proteins Biological Assay Biosynthetic Pathways Gene Expression Regulation, Plant Genes, Plant Lactones Luciferases Mutation Seedling Beta Carotene Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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