Abstract
In the present study, micromorphology and comparative anatomy of young root, stem and leaf of three economically important taxa of Brassica L. viz., B. rapa L. subsp. campestris (L.) Clapham, B. juncea (L.) Czern. and B. napus L. are investigated in detail for the first time in Bangladesh by using light microscopy (LM). In anatomical studies, cross sections of young root, stem and leaf have been examined and biometric measurement of cell and tissues are presented. The micromorphological studies are related to the epidermal surface. In addition, the stomatal index and stomatal index ratio of these taxa have been calculated and presence of simple, non-glandular, unicellular trichome on stems and leaves also been observed except on the stem of B. rapa L. subsp. campestris (L.) Clapham. The anatomical study reveals that the investigated taxa have primary growth in roots and stems as well as amphistomatic and bifacial leaves with anisocytic stomata have been noticed. Finally, presence of tetrarch or single strand exarch xylem in vascular bundle of root, the size, shape and presence or absence of trichome over stem, shape of midrib of leaf have been considered to provide reliable features for identification of the Brassica species.
 Bangladesh J. Plant Taxon. 27(1): 15-26, 2020 (June)
Highlights
The family Brassicaceae consists of 338 genera and 3709 species and dispersed all through the world, basically in temperate regions of the Northern Hemisphere (Warwick et al, 2006; Kasem et al, 2011)
Seeds of B. juncea (L.) Czern. and B. napus L. were collected from the Oilseeds Research Center (ORC) of Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur, Bangladesh
The comparative anatomy and micromorphology of Brassica species growing in Bangladesh are thoroughly investigated
Summary
The family Brassicaceae consists of 338 genera and 3709 species and dispersed all through the world, basically in temperate regions of the Northern Hemisphere (Warwick et al, 2006; Kasem et al, 2011). The genus Brassica L. includes around 100 economically important species with great hereditary and morphological assorted diversity (Jahan et al, 2013). In Bangladesh, the Brassicaceae family is represented by 12 genera and 24 species (Ahmed et al, 2008). Oleiferous Brassica species viz. B_rapa, B. juncea and B. napus constitute the world's third most vital source of consumable oils (Gupta and Pratap, 2007), and are considered as one of the leading oilseed crops in Bangladesh (Razzaque and Karim, 2007)
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