Strigolactone signaling is required for auxin-dependent stimulation of secondary growth in plants

被引:304
作者
Agusti, Javier [1 ]
Herold, Silvia [1 ]
Schwarz, Martina [1 ]
Sanchez, Pablo [1 ]
Ljung, Karin [2 ]
Dun, Elizabeth A. [3 ]
Brewer, Philip B. [3 ]
Beveridge, Christine A. [3 ]
Sieberer, Tobias [4 ]
Sehr, Eva M. [1 ]
Greb, Thomas [1 ]
机构
[1] Austrian Acad Sci, Gregor Mendel Inst Mol Plant Biol, A-1030 Vienna, Austria
[2] Swedish Univ Agr Sci, Umea Plant Sci Ctr, Dept Forest Genet & Plant Physiol, SE-90183 Umea, Sweden
[3] Univ Queensland, Sch Biol Sci, St Lucia, Qld 4072, Australia
[4] Univ Vienna, Max F Perutz Labs, Dept Microbiol Immunobiol & Genet, A-1030 Vienna, Austria
基金
瑞典研究理事会; 奥地利科学基金会; 澳大利亚研究理事会;
关键词
meristem; wood production; MORE AXILLARY BRANCHES; F-BOX PROTEIN; LEAF SENESCENCE; ACTS DOWNSTREAM; WOOD FORMATION; BUD OUTGROWTH; ARABIDOPSIS; TRANSPORT; GENE; EXPRESSION; MUTANT;
D O I
10.1073/pnas.1111902108
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Long distance cell-to-cell communication is critical for the development of multicellular organisms. In this respect, plants are especially demanding as they constantly integrate environmental inputs to adjust growth processes to different conditions. One example is thickening of shoots and roots, also designated as secondary growth. Secondary growth is mediated by the vascular cambium, a stem cell-like tissue whose cell-proliferating activity is regulated over a long distance by the plant hormone auxin. How auxin signaling is integrated at the level of cambium cells and how cambium activity is coordinated with other growth processes are largely unknown. Here, we provide physiological, genetic, and pharmacological evidence that strigolactones (SLs), a group of plant hormones recently described to be involved in the repression of shoot branching, positively regulate cambial activity and that this function is conserved among species. We show that SL signaling in the vascular cambium itself is sufficient for cambium stimulation and that it interacts strongly with the auxin signaling pathway. Our results provide a model of how auxin-based long-distance signaling is translated into cambium activity and suggest that SLs act as general modulators of plant growth forms linking the control of shoot branching with the thickening of stems and roots.
引用
收藏
页码:20242 / 20247
页数:6
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