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Development of Cambial Variant and Structure of the Secondary Xylem in Argyreia elliptica (Roth) Choisy (Convolvulaceae)

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Abstract

Argyreia is one of the dominant genera of the family Convolvulaceae and is mainly distributed in the tropical and sub-tropical regions of Southeast Asia, the Indian subcontinent and China. In the present study, Argyreia elliptica (Roth) Choisy (Convolvulaceae) is investigated histologically, which showed the development of various kinds of variant secondary growth (multiple cambia, inter-and intraxylary phloem, internal/medullary cambium and inversely oriented successive cambia). The first ring of successive cambium in the main stem and branches initiated from the cells located on the inner margin of pericyclic fibres while subsequent cambia initiated from parenchyma cells external to the phloem formed by earlier cambium. During the initiation, either a few cells become meristematic and directly differentiated into lignified xylem element followed by the cambium became noticeable or the cambium initiates first and formed xylem first followed by phloem. Primary intraxylary phloem initiates concomitant to the protoxylem and protophloem. Additional secondary intraxylary phloem originated from the pith cells and the activity of the internal cambium. In thick stems, interxylary phloem differentiated within the parenchyma islands located within the secondary xylem. A unique and hitherto unreported feature observed is the development of xylem cylinders (without phloem) from the parenchyma cells located external to the phloem of the earlier formed successive cambium. These strands were exclusively composed of fibres and fibriform vessels while wide vessels were observed occasionally. The development of various types of cambial variants is elucidated in detail and compared with the available literature on the family Convolvulaceae.

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Acknowledgements

Present work is dedicated to Prof. Sherwin Carlquist (July 1930 – December 2021) for his immense contribution in the field of Island Biology, Plant and Ecological/systematic wood anatomy, particularly in the field of increase in woodiness. The authors are thankful to Mr. Amit D. Gondaliya for his help during histological preparations. The authors are also thankful to the Editor and both the anonymous reviewers for their valuable suggestions on the earlier version of the manuscript.

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Conceptualization and design, KKK and KSR; Sample collection and histological preparation, KKK, PRL and VBS; Analysis and interpretation, KSR and KKK; Investigation, KKK, PRL, VSB and KSR; Writing: original draft, KSR, and VBS; Writing: review and editing, KSR and VBS.

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Correspondence to Kishore S. Rajput.

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The authors have no competing interests to declare that are relevant to the content of this article.

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Kapadane, K.K., Lawand, P.R., Shimpale, V.B. et al. Development of Cambial Variant and Structure of the Secondary Xylem in Argyreia elliptica (Roth) Choisy (Convolvulaceae). J Plant Growth Regul 42, 2506–2518 (2023). https://doi.org/10.1007/s00344-022-10722-1

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  • DOI: https://doi.org/10.1007/s00344-022-10722-1

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