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Gravity perception and asymmetric growth in plants - A model derived from the grass pulvinusIt is pointed out that gravitropic responses in plants involve asymmetric growth. On the basis of the geometry of growth response in grass leaf sheath pulvinus, a general model is proposed for gravitropism in multicellular plant organs. The negative gravitropic response of a pulvinus is a result of cell elongation involving all but the uppermost region of a horizontally placed organ. Whereas the uppermost region does not grow, the lowermost region elongates maximally. The regions between elongate to intermediate extents. An expression is given relating the angle of curvature of the organ to the diameter and initial and final lengths of the organ. It is shown that the response of the individual cells can be expressed as inherent sensitivity to gravitational stimulus according to a particular equation.
Document ID
Document Type
Reprint (Version printed in journal)
Dayanandan, P.
(Michigan Univ. Ann Arbor, MI, United States)
Franklin, C. I.
(Michigan Univ. Ann Arbor, MI, United States)
Kaufman, P. B.
(Michigan, University Ann Arbor, MI, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Life Sciences (General)
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