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The Effect of Cyclopropane on Ion Uptake and Protoplasmic Streaming in Barley Roots
Author(s) -
JACOBSON L.,
YOUNG L. C. T.
Publication year - 1971
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.1399-3054.1971.tb01439.x
Subject(s) - chemistry , cytoplasmic streaming , ion , zoology , biophysics , botany , nuclear chemistry , horticulture , biochemistry , biology , cytoplasm , organic chemistry
Increasing concentrations of cyclopropane up to about 95 % C 3 H 6 —5 % O 2 caused an increasing inhibition of uptake by excised barley roots from KC1 solution, much more so for Cl than K. No inhibition of K uptake from K 2 SO 4 occurred under similar conditions. It is suggested that the small decrease in K uptake from KC1 is related to the large decrease in Cl uptake and that C 3 H 6 primarily inhibits Cl uptake with little or no effect on K uptake. Time curves of uptake in 80 % C 3 H 6 20 % O 2 revealed no indication of cumulative injury in either KC1 or K 2 SO 4 for periods up to 3 hours. The amount of organic acid production associated with K uptake from K 2 SO 4 was about the same in 80 % C 3 H g — 20 % O 2 as in air. Oxygen consumption in K 2 SO 4 was unaffected by the gas mixture and only slightly affected in KC1. Protoplasmic streaming in epidermal cells was rapidly stopped at C 3 H 6 concentrations of 20 % or higher. In 80 % C 3 H 6 –20 % O 2 the effect on streaming was confined mostly to the outer two or three layers of root cells. A connection between the cessation of streaming and the inhibition of Cl uptake appeared to exist but very little if any relationship between streaming and K uptake was observed.