Anatomy and stomatal micromorphology of Psophocarpus tetragonolobus (L.) DC. (Winged Bean)
Keywords:
Psophocarpus tetragonolobus, stem, leaf, petiole, root, node, stomataAbstract
Psophocarpus tetragonolobus (winged bean) belongs to the family Fabaceae. It is self-pollinated and growing in the tropical regions of the world. Present study investigated the anatomy of stem, node, petiole, leaf, root and stomatal micro- morphological characters of this species. Stem anatomy showed epidermis, cortical layers (collenchyma and chlorenchyma) schlerencymatous bundle sheath with conjoint, collateral vascular bundle and unilacunar node. One of the distinguishing features in leaf anatomy was the presence of sac like outgrowths filled with simple parenchyma and were usually seen opposite side to the midrib vascular bundle. In the petiole, vascular strands were cylindrical and arc shaped and in roots, four xylem and four phloem patches were present. Paracytic stomata were seen on both sides of the leaves. The stomatal index on adaxial and abaxial surface was 5.54-9.27% and 53.57-61.29% respectively. In general anatomical characteristics of P.tetragonolobus were used for the identification key of this species.
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