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The Elongation Of The Leaf Of Cyclamen Persicum Mill. (Cultivars), Marshall D. Sundberg
The Elongation Of The Leaf Of Cyclamen Persicum Mill. (Cultivars), Marshall D. Sundberg
Journal of the Minnesota Academy of Science
The leaves of three cultivars of Cyclamen persicum were examined at several stages of development in order to determine the pattern of elongation in both the lamina and petiole. Although there is a considerable literature on lamina elongation, relatively little is known about the growth of the petiole. In the latter structure it is usually assumed that an intercalary meristem is involved. Elongation of the young leaf is initially due to activity distributed throughout the deve1opint organ. Maturation of the leaf progresses acropetally from the base of the petiole and basipetally from the tip of the lamina. As the leaf …
Organization Of The Primary Body In The Root Of Cyclamen Persicum Mill, Marshall D. Sundberg
Organization Of The Primary Body In The Root Of Cyclamen Persicum Mill, Marshall D. Sundberg
Journal of the Minnesota Academy of Science
The primary body of the root of Cyclamen persicum Mill. is described. The rootcap consists of two components of separate origin. Cells of the columella are derived from the dermatocalyptrogen by periclinal wall formation. Further growth of the columella is due primarily to the increase in size of existing cells. Cells of the lateral rootcap arise from the protoderm by periclinal wall formation. Continued growth in this region is due to both increase in cell number and increase in size of existing cells. Proximal to the dermatocalyptrogen is the presumptive quiescent center. Around the periphery of this zone are located …