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Instability of the growth-limiting proteins of theAvenacoleoptile and their pool size in relation to auxin

✍ Scribed by Robert Cleland

Publisher
Springer-Verlag
Year
1971
Tongue
English
Weight
579 KB
Volume
99
Category
Article
ISSN
0032-0935

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✦ Synopsis

The stability and pool size of the growth-limiting proteins (GLP) of the Avena coleoptile have been studied by measuring the time required for cycloheximide to inhibit the growth of auxin-treated segments. Inhibition of growth follows inhibition of protein synthesis by 20-25 rain regardless of the growth rate. This indicates that the growth inhibition is due to inherent instability of the GLP rather than to exhaustion of the pool through growth. A study of the amount and rate of auxin-induced growth which occurs when cycloheximide is added just before or after the auxin indicates that the rate of elongation is determined by the size of the GLP pool, and that the pool of GLP is low in the absence of auxin, but rapidly expands and reaches a maximum 20-25 rain after addition of auxin. Three ways in which auxin might expand the pool of GLP are discussed.

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