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Vessel differentiation along different tissue polarities
Author(s) -
Gersani Mordechai
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb02852.x
Subject(s) - polarity (international relations) , auxin , brassica , chemistry , orientation (vector space) , diffusion , biophysics , botany , biology , physics , biochemistry , geometry , mathematics , cell , thermodynamics , gene
Organized vessel differentiation in an isolated system was studied on a quantitative basis. An auxin source was oriented on isolated pieces of turnip storage root ( Brassica campestris cv. Rapifera) to allow diffusion a) in the direction of, b) at right angle to, and c) opposite to the original polarity. New vessel members differentiated within 44 h, and a minimum average auxin (IAA) concentration of 3.10 −6 M was required to induce initial vessel differentiation. The differentiation rates in three experimental orientations were 167, 60 and 43 cells h −1 at 10 −3 M IAA, and 1445, 1346 and 838 cells (log IAA concentration) −1 after 96 h, respectively. The difference between the differentiation rates in the original polarity orientation (a) and in the orientation at right angle (b) is interpreted as reflecting reorientation itself, which requires a minimum time.