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Annals of Botany 37: 981-985, 1973
© 1973 Annals of Botany Company

RESEARCH-ARTICLE

Anomalous Growth in the Stem of Ipomoea batatas (L.) Lam. Infested with Megastes Larvae

E. J. DUNCAN

Department of Biological Sciences, The University of the West Indies St. Augustine, Trinidad

Received: 27 November 1972   

The stem of Ipomoea batatas (L.) Lam. is characterized by the possession of a ring of bicollateral, leaftrace bundles. Lacticifers occur in the pith, in the parenchyma between neighbouring islands of medullary phloem, and in the cortex.

The xylem groups become united by the activity of the inter-fascicular cambium. The production of a certain amount of secondary xylem takes place before the production of secondary phloem begins. The former is produced more extensively in some areas than in others, so that the original symmetry of the vascular cylinder is lost. The phellogen originates in the cells of the epidermis.

When the stem is attacked by the larvae of Megastes grandalis Guen., which remove most of the internal tissues, anomalous growth takes place as a result of the activity of accessory cambia, which develop in the primary cortex, the secondary phloem, and the phelloderm. Residual parenchyma of the pith and/or xylem undergoes hyperplasia to produce a callus tissue which lines the cavity made by the larvae.


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