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The coleoptile sheath of wheat impedes oxygen transport to seminal roots
Author(s) -
THOMSON C. J.,
ARMSTRONG W.
Publication year - 1990
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1990.tb02145.x
Subject(s) - coleoptile , shoot , chemistry , horticulture , oxygen , botany , analytical chemistry (journal) , biology , chromatography , organic chemistry
Wheat, Triticum aestivum cv. Gamenya, seedlings were grown for 4d in acrated 0.5 mol m −3 CaSO 4 solution. A cylindrical platinum‐electrode and vernier microscope were used to examine the effects of the colcoptile sheath on O 2 transport from shoots to seminal roots via the internal gas‐space system, and on the clongation of the root tip. By removing the colcoptile sheath, O 2 concentrations at the root tip in an O 2 ‐free medium at 5°C increased from 0.017 to 0.17 mol m −3 O 2 when 100 kPa O 2 was around the shoots. When the shoots were in air, the separation of the colcoptile sheath from the primary leaf caused the rate of root clongation in the anoxic medium to increase by two fold.