Developmental study on tendrils ofCardiospermum halicacabum L
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InC. halicacabum the main bud meristem which develops into an inflorescence is axillary and distinct at the second node below the shoot apex. In its further development two opposite bract primordia develop at its first node and they bear two axillary tendril primordia. The inflorescence axis at its terminal region develops into three floral branches with three subtending bracts. Two or three accessory buds are associated with the inflorescence at the axil.
The trace procambium of the inflorescence axis develops acropetally. Frequent periclinal divisions at tendril apex followed by rapid elongation of the cells and the general intercalary growth considerably increase the length of the tendril primordium. There is a single bract trace and the nature of the vascular supply to the peduncle is similar to that of the tendril. Ontogenetically the tendril is a lateral floral branch.
KeywordsShoot Apex Leaf Trace Inflorescence Axis Rapid Elongation Inflorescence Branch
Key to Abbreviations
accessory bud trace
branch trace of inflorescence axis
- IT1, IT2, IT3
traces for three terminal branches of inflorescence axis
lateral leaf trace
median leaf trace
- N1, N2, N3
number of nodes from below in a seedling
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