Summary and Conclusions
The root apical organization of eight species of plants belonging to the Compositae exhibit three types of structural configuration.
The cap is considered as having two regions, the columella and the peripheral part with their separate initiating regions.
The modes of widening of the columella is discussed.
On the basis of the structural configurations met with in these root apices a phylogenetic line in their evolution is put forwardtentatively.
The cytohistological state of the root apices studied supports the concept of a quiescent centre and a meristematic zone. This study also shows that there are four peak periods for division of cells during a day of 24 hours in root tips ofZinnia.
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Communicated by Dr. V. Puri,f.a.sc.
Now Mrs. Omana Devassy.
Now Birla Institute of Technology and Science.
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Pillai, S.K., George, O.M. & Vijayalekshmi, P. Apical organization of the roots of dicotyledons. Proc. Indian Acad. Sci. 61, 296–308 (1965). https://doi.org/10.1007/BF03050959
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DOI: https://doi.org/10.1007/BF03050959