Anatomical and physiological aspects of developmental processes of adventitious root formation in Azukia cuttings |
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Authors: | Mitsuhashi-Kato, Mieko Shibaoka, Hiroh Shimokoriyama, Masami |
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Affiliation: | Department of Botany, Faculty of Science, University of Tokyo Hongo, Bunkyo-ku, Tokyo 113, Japan and Department of Biology, Tokyo Metropolitan University Fukazawa, Setagaya-ku, Tokyo 158, Japan |
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Abstract: | In Azukia stem cuttings, root primordia always appeared in theinterfascicular regions between the endodermis and the interfascicularcambium. Transverse cell divisions were observed as the first eventsin the process of root formation. They began to occur 10 hrafter cuttings had been made and were restricted to the interfascicularregions about 1 mm above the basal cut end of the cutting. Ineach of interfascicular region, 10 to 20 cells divided. Transversedivisions were followed by longitudinal divisions, which beganto occur 18 hr after cuttings had been made. The early process of root primordium formation is distinguishedby the following three phases: the first phase during whichno cell division occurs (08 hr), the second phase duringwhich transverse cell divisions occur (816 hr) and thethird phase during which longitudinal divisions occur (1624hr). Cuttings in each phase responded differently to test substances. 1Supported in part by Grant No. 139011 from the Ministry ofEducation, Japan.2 Present address: Junior College of Toyo University, Hakusan,Bunkyo-ku, Tokyo 112, Japan. (Received October 24, 1977; ) |
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