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The growth retardant (2-chloroethyl)trimethylammonium chloride (CCC) induced swollen root tips on seedling of grapevines (Vitis vinifera L.) as well as on plants grown for cuttings.
In both cases CCC had to be applied to the growth medium for the response to be expressed; spraying the shoots reduced stem growth without inducing swollen roots.
N-dimethylaminosuccinamic acid(B995) was ineffective in causing root symptoms on grapes, nor did the root swelling appear on five other species treated with CCC.
On the other hand, kinetin resulted in grape roots with in some respects resembled those treated with CCC.
Both the concentration and absolute amounts of cytokinin activity in the sap increased by CCC, indicating that this retardant probably affected the cytokinin syntheses by the root tip. The results are interpreted to indicate that in grapes, CCC act directly on the root meristem to increase cytokinin production. Swelling of the tips is probably a consequence of elevated cytokinin levels in this region.
The Relationship Between the Effects of CCC on Root Growth and Cytokinin Levels in the Bleeding Sap of Vitis vinifera L.
1970, Journal of Experimental Botany, vol 21, issue 67, month 5, pages 418 – 431
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