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Plant Physiology 67:278-281 (1981)
© 1981 American Society of Plant Biologists

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Articles

Effect of Auxin on Acropetal Auxin Transport in Roots of Corn

Lewis J. Feldman

Department of Botany, University of California, Berkeley, California 94720

Acropetal [14C]indoleacetic acid (IAA) transport was investigated in roots of corn. At least 40 to 50% of this movement is dependent on activities in the root apex. Selective excision of various populations of cells comprising the root apex, e.g. the root cap, quiescent center, or proximal meristem show that the proximal meristem is the critical region in the apex with regard to influencing IAA movement. The quiescent center has no influence and the root cap has only a minor effect. Excision and replacement of the proximal meristem with an exogenous supply of 10–8 to 10–9 molar IAA prevents the reduction in acropetal IAA transport which would normally occur in the absence of this meristem. Substituting 10–9 molar IAA for the excised root cap brings about a significant increase in the amount of IAA moved acropetally, as compared to intact roots with the root cap still in place. From this and previous work, it is concluded that IAA synthesis occurring in the proximal meristem stimulates the movement of IAA from the basal to apical end of the root.




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N. M. Kerk and L. F. Feldman
A biochemical model for the initiation and maintenance of the quiescent center: implications for organization of root meristems
Development, September 1, 1995; 121(9): 2825 - 2833.
[Abstract] [PDF]


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Copyright © 1981 by the American Society of Plant Biologists