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Ionic signaling in plant responses to gravity and touchTouch and gravity are two of the many stimuli that plants must integrate to generate an appropriate growth response. Due to the mechanical nature of both of these signals, shared signal transduction elements could well form the basis of the cross-talk between these two sensory systems. However, touch stimulation must elicit signaling events across the plasma membrane whereas gravity sensing is thought to represent transformation of an internal force, amyloplast sedimentation, to signal transduction events. In addition, factors such as turgor pressure and presence of the cell wall may also place unique constraints on these plant mechanosensory systems. Even so, the candidate signal transduction elements in both plant touch and gravity sensing, changes in Ca2+, pH and membrane potential, do mirror the known ionic basis of signaling in animal mechanosensory cells. Distinct spatial and temporal signatures of Ca2+ ions may encode information about the different mechanosignaling stimuli. Signals such as Ca2+ waves or action potentials may also rapidly transfer information perceived in one cell throughout a tissue or organ leading to the systemic reactions characteristic of plant touch and gravity responses. Longer-term growth responses are likely sustained via changes in gene expression and asymmetries in compounds such as inositol-1,4,5-triphosphate (IP3) and calmodulin. Thus, it seems likely that plant mechanoperception involves both spatial and temporal encoding of information at all levels, from the cell to the whole plant. Defining this patterning will be a critical step towards understanding how plants integrate information from multiple mechanical stimuli to an appropriate growth response.
Document ID
20040088318
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fasano, Jeremiah M. (University Park Pennsylvania 16802, United States)
Massa, Gioia D.
Gilroy, Simon
Date Acquired
August 21, 2013
Publication Date
June 1, 2002
Publication Information
Publication: Journal of plant growth regulation
Volume: 21
Issue: 2
ISSN: 0721-7595
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Review
Non-NASA Center
NASA Discipline Plant Biology
Review, Academic