Microscopic characterization of petiole anatomy of Asteraceous taxa of Western Himalaya-Pakistan |
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Authors: | Anam Akhtar Mushtaq Ahmad Tariq Mahmood Amir Muhammad Khan Muhammad Arfan Qamar Abbas Muhammad Zafar Shazia Sultana Rabia Batool Anam Fatima Siraj Khan Sher Aman Ullah Amjad Khan |
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Affiliation: | 1. Department of Plant Sciences, Quaid-i-Azam University Islamabad, Islamabad, Pakistan;2. Department of Forestry, College of Agriculture, University of Sargodha, Sargodha, Pakistan;3. Department of Botany, University of Mianwali, Mianwali, Pakistan
Department of Botany, University of Sargodha, Sargodha, Pakistan;4. Department of Botany, University of Education Lahore Vehari Campus, Vehari, Pakistan;5. Biological Sciences Department, Karakoram International University, Gilgit, Pakistan;6. Government College for Women, Mianwali, Pakistan;7. Department of Botany, University of Mianwali, Mianwali, Pakistan;8. Department of Botany, Abdul Wali Khan University, Mardan, Pakistan |
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Abstract: | Petiole anatomy of 15 species of family Asteraceae was examined which aimed to investigate petiolar anatomical structures for species level identification. Shandon Microtome was used for petiole histological preparations. Both qualitative and quantitative features were studied under microscope which showed significant variation in petiole, collenchyma, parenchyma shape/size, vascular bundles arrangement/size, and vessel elements quantity. Artemisia japonica Thunb., Cirsium vulgare (Savi) Ten., Myriactis nepalensis Less., Seriphidium brevifolium Ling & Y.R.Ling, Taraxacum officinale (L.) Weber ex F.H.Wigg., and Xanthium strumarium L. showed winged petioles. Maximum length and width of upper and lower epidermis was found in Tagetes erecta L. which is 23.05 ± 0.89 μm, 24.9 ± 1.257 μm length and 21.75 ± 1.38067 μm, 22.75 ± 0.467 μm width, respectively. Petioles of Parthenium hysterophorus L. was longest one with 9.85 ± 10.45 μm while A. japonica Thunb. showed highest number of vessel elements. Maximum size of vascular bundles was found in T. erecta L. with 5.05 ± 14.25 μm. Artemisia annua L., C. vulgare (Savi) Ten, Cyanthillium cinereum (L.) H.Rob., Helianthus annus L., M. nepalensis Less., P. hysterophorus L., Senecio chrysanthemoides DC. have trichomes while Tussilago farfara L. has highest number of vascular bundles. All species have angular collenchyma type except M. nepalensis Less., P. hysterophorus L., S. brevifolium Ling & Y.R.Ling, Tagetes minuta L., T. officinale L., S. chrysanthemoides DC., and T. farfara L. Cluster analysis implemented that distinct plant species in cluster. Petiolar anatomical structures and taxonomic key will helpful for distinguishing Asteraceous taxa at genus and species level. This taxonomic significant investigation will also provide baseline to taxonomists for other Asteraceae studies and phylogenetic research. |
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Keywords: | cluster analysis petiole Shandon Microtome taxonomic key trichomes |
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