Formation of medullary phloem in Argyreia nervosa (Burm. f.) Bojer

Authors

  • Kilas K Kapadane Dadasaheb Raval S.V.S. Science College, Dondaicha 455408, Maharashtra, India
  • Ravindra A Shelke Kisan Arts, Commerce and Science College, Parola 425111, Maharashtra, India
  • Amit D Gondaliya Department of Botany, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, Gujarat, India
  • Kishore S. Rajput Department of Botany, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, Gujarat, India

DOI:

https://doi.org/10.14719/pst.2019.6.2.498

Keywords:

Cambial variant, Convolvulaceae, intraxylary/internal phloem, medullary bundles

Abstract

Histologically, family Convolvulaceae is characterised by the presence of successive cambia, medullary (internal/intraxylary) and interxylary phloem in majority of the species, whereas some of the members are devoid of successive cambia and medullary bundles. The present study on Argyreia nervosa (Burm. f.) Bojer showed the presence of medullary bundles while internal phloem was absent during the primary growth. As the secondary growth progressed, successive cambia initiated from the pericyclic parenchyma. Development of medullary bundles began along with the regular protoxylem and protophloem while formation of intraxylary phloem was observed only after the initiation of secondary growth. Medullary/intraxylary sieve elements began to develop from the marginal pith cells. In thick stems, small segments of internal cambium initiated between the protoxylem and internal phloem. This internal cambium was functionally unidirectional and produced internal phloem centripetally. Developmental particulars are described in details along with its significance.

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Published

27-04-2019

How to Cite

1.
Kapadane KK, Shelke RA, Gondaliya AD, Rajput KS. Formation of medullary phloem in Argyreia nervosa (Burm. f.) Bojer. Plant Sci. Today [Internet]. 2019 Apr. 27 [cited 2024 Nov. 4];6(2):151-9. Available from: https://horizonepublishing.com/journals/index.php/PST/article/view/498

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Research Articles