Leaf-Induced Gibberellin Signaling Is Essential for Internode Elongation, Cambial Activity, and Fiber Differentiation in Tobacco Stems  | Zendy

Jonathan Dayan | Zendy; Nickolay Voronin | Zendy; Fan Gong | Zendy; Taiping Sun | Zendy; Peter Hedden | Zendy; Hillel Fromm | Zendy; Roni Aloni | Zendy

Open Access

Leaf-Induced Gibberellin Signaling Is Essential for Internode Elongation, Cambial Activity, and Fiber Differentiation in Tobacco Stems

Author(s) -

Jonathan Dayan,

Nickolay Voronin,

Fan Gong,

Taiping Sun,

Peter Hedden,

Hillel Fromm,

Roni Aloni

Publication year - 2012

Publication title -

the plant cell

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.324

H-Index - 341

eISSN - 1532-298X

pISSN - 1040-4651

DOI - 10.1105/tpc.111.093096

Subject(s) - gibberellin , nicotiana tabacum , biology , xylem , arabidopsis thaliana , plant stem , arabidopsis , microbiology and biotechnology , elongation , botany , vascular bundle , gene , mutant , biochemistry , materials science , ultimate tensile strength , metallurgy

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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