The Similarity Between CO2 and Acid Buffer Growth Responses of Coleoptiles and Their Inhibition by Calcium
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Authors
Tichenor, Lee Harris
Issue Date
1969
Type
Thesis
Language
en_US
Keywords
Alternative Title
Abstract
A study was made on the comparison between CO2-promoted elongation and
acidic buffer-promoted elongation and how these growth responses could be
affected by calcium. The magnitude and duration of growth response to
acid buffer when osmolar inhibition is removed is 1.29 mm/segment and about
25 minutes, which are nearly the same as for a CO2 response (magnitude
1.26 mm/segment, and duration from 25 to 30 minutes). It was also shown
that KCN does not inhibit the CO2 response. These results indicate that
the CO2 response and acid response are the same and are both physical
responses.
Tests to show calcium inhibition by use of CaCl2 pretreatments
showed inhibition by calcium of the acid response by increased latent
period before noticeable growth rate increase (2 to 8 min.) and about a
50% reduction in the magnitude of the response. Tests to show inhibition
by treatment of CaCl2 after initiation of a C02 response were inconclusive
due to the osmolar effects of the CaC12 solutions.
A more conclusive test of the role of calcium in elongation growth of
plants is also presented.
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Description
v, 25 p.
Citation
Publisher
Kalamazoo College
License
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