Abstract
SummaryThe appearance of the phloem is described for the trees Albizia adianthifolia, Bombax buono‐pozense, Antiaris africana, Holarrhena floribunda, Ricinodendron heudelotii, Sterculia tragantha, and Tectona grandis. Measurements of the percentage sieve tube area, the sieve tube number per unit and the diameters of the sieve tubes have been made throughout one year. Changes in structure and composition of the phloem occurred in different ways in the several species at different times of the year. Increase in length of sieve tube elements with age was found in four of the species. In the three species with compound oblique sieve plates the pores were less than μm diameter, and the percentage sieve tube area was lower than that of the trees with phloem with simple sieve plates. The variety of phloem structure and the quantitative changes in phloem dimensions are discussed; the need for thorough investigation of phloem structure for each species as a prelude to physiological studies of the phloem is emphasized.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
