Journal
PLANT CELL
Volume 24, Issue 1, Pages 66-79Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.111.093096
Keywords
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Funding
- Manna Foundation
- Biotechnology and Biological Sciences Research Council of the UK
- U.S. National Science Foundation [IOS-0641548, MCB-0923723]
- BBSRC [BBS/E/C/00004951, BBS/E/C/00005202, BBS/E/C/00004954] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00005202, BBS/E/C/00004954, BBS/E/C/00004951] Funding Source: researchfish
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The gibberellins (GAs) are a group of endogenous compounds that promote the growth of most plant organs, including stem internodes. We show that in tobacco (Nicotiana tabacum) the presence of leaves is essential for the accumulation of bioactive GAs and their immediate precursors in the stem and consequently for normal stem elongation, cambial proliferation, and xylem fiber differentiation. These processes do not occur in the absence of maturing leaves but can be restored by application of C-19-GAs, identifying the presence of leaves as a requirement for GA signaling in stems and revealing the fundamental role of GAs in secondary growth regulation. The use of reporter genes for GA activity and GA-directed DELLA protein degradation in Arabidopsis thaliana confirms the presence of a mobile signal from leaves to the stem that induces GA signaling.
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