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Annals of Botany 23: 361-363, 1959
© 1959 Annals of Botany Company

RESEARCH-ARTICLE

The Effect of PCIB on the Germination and Growth of Lettuce in the Presence of Thiourea

A. POLJAKOFF-MAYBER, A. M. MAYER and S. ZACKS

Department of Botany, the Hebrew University, Jerusalem, and Technion, Israel Institute of Technology Haifa

The joint action of the anti-auxin parachlorophenoxy isobutyric acid (PCIB) and thiourea on germination and growth of lettuce seed was investigated. PCIB alone did not affect germination or hypocotyl growth of lettuce. Root growth was stimulated by PCIB. In germination PCIB showed interaction at all the thiourea concentrations. All thiourea concentrations reversed the stimulation of root growth caused by PCIB, except the lowest thiourea concentration with the highest PCIB one.

In hypocotyl growth the two substances showed no interaction. These results are discussed in relation to the auxin and anti-auxin effects in germination and growth.


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