Axial and Radial Analyses of Selected Conductive and Storage Features in the Stem of Citrus aurantifolia

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Jonathan Eromosele Otoide Joshua Kayode

Abstract

Background and objectives: Citrus aurantifolia is used in daily consumption, in many cultural cuisines, in juice production and ethnomedicine. Selected conductive and storage features (i.e. vessels and rays) in the stem of Citrus aurantifolia (Christm.) Swingle were analyzed along the axial and radial axes of the stem.
Methods: The lengths, diameters and heights of the features were measured in micrometers (μm). Data were collected from 50 measurements and thereafter subjected to statistical analyses.
Results: The mean lengths (μm) and diameters (μm) of vessels in the stem were 112.75 ± 61.58, 172.21 ± 86.45, 142.99 ± 72.93 and 53.43 ± 23.07, 61.89 ± 19.40 and 58.48 ± 19.29 for the base, middle and top regions through the axial axis. These values were not significantly different from one another at P ≤ 0.05. The heights and widths (μm) of the rays were 234.83 ± 49.68, 260.92 ± 77.57, 250.65 ± 62.66 and 32.99 ± 6.61, 40.23 ± 11.83 and 36.19 ± 9.49 for the base, middle and top regions of the stem along the axial axis respectively. Consequently, there were significant differences at P ≤ 0.05 at one region and the other. Microscope observation of the features revealed numerous clusters of vessels occurring in triplets, doublets and multiple forms, storeyed rays, heterogeneous and homocellular rays. The present analyses placed the vessels in the stem of this species in the class of narrow and short vessels being less than 350μm.
Conclusion: It was asserted that this ‘built’ would confer some degree of competitive advantage on this species. Replication of the vessels and rays typical of Citrus aurantifolia was suggested to plant breeders and experts of crop improvements.

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