期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 13, 页码 E1300-E1309出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1403016111
关键词
root development; patterning; secondary metabolite synthesis
资金
- Australian Research Council Centre of Excellence in Plant Energy Biology [CE140100008]
- Australian Government International Postgraduate Research Scholarship
- Collaborative Awards in Science and Engineering PhD studentship
- Biotechnology and Biological Sciences Research Council
- Syngenta, Ltd.
- National Institutes of Health National Research Service Award postdoctoral fellowship [GM093656-02]
- Defense Advanced Research Planning Agency [D12AP0000]
- Howard Hughes Medical Institute [GBMF3405]
- Gordon and Betty Moore Foundation
- [DP130102593]
- Biotechnology and Biological Sciences Research Council [1091727, BB/D005787/1] Funding Source: researchfish
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.
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