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

Proceedings of the National Academy of Sciences of the United States of America - Tập 108 Số 50 - Trang 20242-20247 - 2011
Javier Agustí1, Silvia Herold1, Martina Schwarz1, Pablo Sánchez1, Karin Ljung2, Elizabeth A. Dun3, Philip B. Brewer3, Christine A. Beveridge3, Tobias Sieberer4, Eva Maria Sehr1, Thomas Greb1
1Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, 1030 Vienna, Austria
2Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden;
3School of Biological Sciences, University of Queensland, St. Lucia QLD 4072, Australia; and
4Max F. Perutz Laboratories, Department of Microbiology, Immunobiology, and Genetics, University of Vienna, 1030 Vienna, Austria

Tóm tắt

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.

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Proceedings of the National Academy of Sciences of the United States of America

Tập 108 Số 50

20242-20247

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