Abstract
Stem anatomical features of four Sesbania Scop. species viz. S. bispinosa (Jacq.) W. Wight, S. cannabina (Retz.) Poir., S. sesban (L.) Merr., and S. rostrata Bremek. & Oberm., were examined to add some insights for identification of these species using quantitative anatomical descriptors. Sesbania stem is composed of epidermis, cortex, vascular tissues – phloem, cambium zone and xylem, and pith, which exhibit significant variations among the species in terms of their area and thickness. Sesbania sesban showed the largest area and widest epidermal cells. The close relationship between S. bispinosa and S. rostrata was found in the stem anatomical descriptors. Moreover, S. rostrata and S. cannabina were closer to some extent according to some anatomical descriptors; also rationalizing the external morphological similarities of these species. A dichotomous key of the studied Sesbania species was made. Dendrograms based on Agglomerative Hierarchical Cluster analysis of stem anatomical descriptors also confirmed close relationships identified in previous phylogenetic analyses. Bangladesh J. Plant Taxon. 28(2): 441-449, 2021 (December)
Highlights
The genus Sesbania Scop. includes about 70 species of which 27 species produce nodules (DeFaria et al, 1989; Farruggia et al, 2018)
S. rostrata and S. cannabina were closer according to their epidermal attributes that justifies the observations reported by Chanda et al (2020b) for the identification of Sesbania species based on external morphological descriptors
The thickness of the sieve tube wall was highest in both S. cannabina and S. rostrata and it was statistically insignificant to S. bispinosa, it was statistically identical with S. sesban (Table 1)
Summary
The genus Sesbania Scop. includes about 70 species of which 27 species produce nodules (DeFaria et al, 1989; Farruggia et al, 2018). The largest epidermal cell area was observed in S. sesban (999.8 μm2) followed by S. bispinosa (857.9 μm2) and the lowest in S. cannabina (667.8 μm2) followed by S. rostrata (693.2 μm2) (Table 1). Statistically significant results were found in S. rostrata, S. bispinosa and S. cannabina in thickness of epidermal cell wall.
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