Taxonomic Significance of Sepal Studies in Some Solanum Linn. Species in Nigeria

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Author(s) Essiett, U. A. | Thompson, E. O.
Pages 334-350
Volume 4
Issue 7
Date July, 2015
Keywords Solanum Species, Trichomes, Stomatal Index, Epidermal Cells, Sepals, Abaxial and Adaxial Surface.

The taxonomic significance of sepal anatomy of Solanum species are been described, the species studied are hypoamphistomatic but with higher stomatal index on the abaxial surface. Epidermal cells were mostly polygonal in shape with straight to slightly undulating anticlinal walls. The mature stomata were anisocytic, anomocytic, staurocytic, brachyparacytic and paracytic. However abnormal stomata include aborted stomata, stomata with unopened stomatal pore, two stomata sharing one subsidiary cell, one guard cell, parallel contiguous stomata, vertical contiguous stomata, and multiple contiguous stomata. The most abundant stomata were anisocytic followed by anomocytic, staurocytic and brachyparacytic. The stomatal index varied between the species both in the adaxial and abaxial surfaces of the sepals. The highest stomatal index were observed in the abaxial surface of Solanum aethiopicum x S. dasyphyllum while the lowest were in adaxial surface of Solanum gilo. Ellipsiodal glandular trichomes were more numerous on the adaxial surfaces of these species than on the abaxial surfaces, unicellular trichomes were mostly observed on the adaxial surfaces of Solanum anomalum, Solanum gilo and S. melongena (purple variety), stellate types were more abundant on the abaxial surfaces of S. gilo, S. anomalum and S. melongena. Stellate trichomes were sparsely distributed on abaxial surface of S. aethiopicum x S. dasyphyllum. This study also indicated that epidermal characteristics of the sepals had valuable taxonomic traits which can be utilized to address the taxonomic issues within the genus.

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