Auxin minimum defines a developmental window for lateral root initiation

被引:94
作者
Dubrovsky, Joseph G. [2 ]
Napsucialy-Mendivil, Selene [2 ]
Duclercq, Jerome [1 ,3 ]
Cheng, Yan [4 ]
Shishkova, Svetlana [2 ]
Ivanchenko, Maria G. [5 ]
Friml, Jiri [1 ,3 ]
Murphy, Angus S. [4 ]
Benkova, Eva [1 ,3 ]
机构
[1] VIB, Dept Plant Syst Biol, B-9052 Ghent, Belgium
[2] Univ Nacl Autonoma Mexico, Inst Biotecnol, Cuernavaca 62250, Morelos, Mexico
[3] Univ Ghent, Dept Plant Biotechnol & Genet, B-9052 Ghent, Belgium
[4] Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA
[5] Oregon State Univ, Dept Bot & Plant Pathol, Corvallis, OR 97331 USA
基金
欧洲研究理事会;
关键词
Arabidospsis thaliana; auxin gradients; cell competence; developmental window; lateral root initiation; Solanum lycopersicum; OF-FUNCTION MUTATION; BOX PROTEIN TIR1; CELL-CYCLE; ARABIDOPSIS; GENE; TRANSPORT; EXPRESSION; GRADIENTS; EFFLUX; FAMILY;
D O I
10.1111/j.1469-8137.2011.03757.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Root system architecture depends on lateral root (LR) initiation that takes place in a relatively narrow developmental window (DW). Here, we analyzed the role of auxin gradients established along the parent root in defining this DW for LR initiation. Correlations between auxin distribution and response, and spatiotemporal control of LR initiation were analyzed in Arabidopsis thaliana and tomato (Solanum lycopersicum). In both Arabidopsis and tomato roots, a well defined zone, where auxin content and response are minimal, demarcates the position of a DW for founder cell specification and LR initiation. We show that in the zone of auxin minimum pericycle cells have highest probability to become founder cells and that auxin perception via the TIR1/AFB pathway, and polar auxin transport, are essential for the establishment of this zone. Altogether, this study reveals that the same morphogen-like molecule, auxin, can act simultaneously as a morphogenetic trigger of LR founder cell identity and as a gradient-dependent signal defining positioning of the founder cell specification. This auxin minimum zone might represent an important control mechanism ensuring the LR initiation steadiness and the acropetal LR initiation pattern.
引用
收藏
页码:970 / 983
页数:14
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