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Correlation between profile of ion‐current circulation and root development
Author(s) -
Miller Andrew L.,
Gow Neil A. R.
Publication year - 1989
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1989.tb02070.x
Subject(s) - biology , botany , arachis hypogaea , vigna , lolium perenne , radiata , horticulture , poaceae
The electrical currents associated with developing primary root tips of Triticum aestivum L. cv. Slejpner, Avena sativa L. cv. Victory I, Lolium perenne L. cv. Melle, Vigna radiata (L.) Wilczek, Arachis hypogaea L., Pisum sativum L. cv. Keluedon Wonder, Lonchocarpus leucanthus Burk, Dalbergia nigra Fr. Allen and Picea abies (L.) Karst. (U. K. Forestry Commission Number: 85/498/B). and that of the adventitious root tips of Fragaria vesca L., Solanum tuberosum L. cv. Maris Piper and Neptunia plena Lindl. were examined with a vibrating electrode. Current was found consistently to enter the meristematic and elongating tissues of all the intact growing roots examined. Mature non‐growing root regions were responsible for generating the outword limb of the current loop. Peak inward current densities ranged between 2 mA m −2 ( Lolium ) and 28 mA m −2 ( Arachis ). The point at which the inward current reversed to outward current also varied between species. These results, which are derived from 5 taxonomically diverse families (Graminae, Leguminosae, Rosaceae, Solanaceae and Pinaceae) extend the range of different species that have been shown to generate ion currents that transverse, in a highly polar manner, the growing regions of their root systems. This supports the correlations between endogenous current generation and root development.