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© 1974 Oxford University Press

RESEARCH-ARTICLE

Root Growth Inhibitors from Root Cap and Root Meristem of Zea mays L.

K. K. KUNDU and L. J. AUDUS

Botany Department, Bedford College Regent's Park, London, N.W.1

A micro-assay based on the growth inhibition of root segments of the seminal roots of Zea mays has been used to investigate the root-growth-inhibiting substances in root caps and meristems respectively of the roots of Zea mays. This micro-assay is sensitive to 50 pg of IAA or less. Paper chromatography of the acid fraction of methanolic extracts shows the presence of one main inhibitor in root caps and a different main inhibitor in root meristems. Neither is IAA, whose presence in meristems is sometimes indicated by small inhibitions (or stimulations) at the characteristic Rf of IAA. A Commelina leaf-epidermis assay shows the presence of one stomata-closing ABA-like substance in root caps and one in meristems, one corresponding in Rf to the main root-growth inhibitor from the root cap. The implications of these findings for the geotropic responses of roots is briefly discussed.


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