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The involvement of the root apex and cytokinins in the control of lateral root emergence in lettuce seedlings

โœ Scribed by N.L. Biddington; A.S. Dearman

Publisher
Springer Netherlands
Year
1982-1983
Tongue
English
Weight
443 KB
Volume
1
Category
Article
ISSN
0167-6903

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โœฆ Synopsis

Removal of the apical 3 mm of the primary root of hydroponically-grown lettuce seedlings 3 or 5 days after sowing, prevented further elongation of the root and increased both the number and total length of lateral roots. The length of the lateral zone, i .e . the distance from the base of the parent root to the lateral nearest the tip, except on one occasion, remained the same as the control in both 3 and 5 day treatments, until the length of the decapitated root (which had ceased elongating) became limiting .

Zeatin applied via the roots, at a concentration range from 3 X 10 -10 M to 10-8 M reduced tap root extension growth at all concentrations . Lateral root emergence was enhanced by low zeatin concentrations and retarded by higher ones . In general, the lateral zone length was the same in cytokinin-treated plants as in untreated controls .

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