Leaf-induced gibberellin signaling is essential for internode elongation, cambial activity, and fiber differentiation in tobacco stems.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Dayan, J; Voronin, N; Gong, F; Sun, T-P; Hedden, P; Fromm, H; Aloni, R

Published Date

  • January 2012

Published In

Volume / Issue

  • 24 / 1

Start / End Page

  • 66 - 79

PubMed ID

  • 22253226

Pubmed Central ID

  • PMC3289570

Electronic International Standard Serial Number (EISSN)

  • 1532-298X

International Standard Serial Number (ISSN)

  • 1040-4651

Digital Object Identifier (DOI)

  • 10.1105/tpc.111.093096


  • eng