Rapid Impact Assessment of Climatic and Physio-graphic Changes on Flagship Group Lepidoptera by DNA Barcoding
Organized byDepartment of Zoology and Environmental Sciences, Punjabi University, Patiala (Pb.) – 147 002, India
Dr A P Singh Associate Professor in Zoology (Entomology),SGGS College (affiliated to Panjab University), Chandigarh (U.T.) - 160 019, India E-mail: email@example.com
The global/regional climatic changes and local physiographic changes are anthropogenic These changes have immense impacts on health of various ecosystems and the biodiversity, including insects, supported by them. The Impact Assessment, is difficult, costly, time consuming and may involve several methods. One of these methods is called, bioassessment Major focus of Bioassessment studies are specific mega-diverse biological groups, the insects being one of them. Among insects, the Lepidoptera is a known flagship group for bioassessment, as shows good species diversity (with over 1,60,000 described species ;Kristensen, et.al.,2007), intraspecific genetic divergence and wide geographical distribution. Lepidopterans are recognized as moths, butterflies and skippers. Many of these are described as biodiversity indicators, ecological indicators, and substantial number of species are pests of agricultural crops, horticultural trees and forest plants. These features further enhance their bioassessment potentials. Bioassessment involves sampling of Lepidopterans for making observations such as species extinction, changed distributional limits and population sizes, and genetic divergence within species. For this rapid identifications of collected samples is required. Rapid identifications and assessment of genetic divergence within species involve the mitochondrial CO1 gene based DNA barcoding (Hajibabaei, et. al., 2004, 2006, Desalle, 2006). Additional mitochondrial genes such as nad1 ,nad4 ,nad5 ,nad6 ,COII, and 16s rRNA are employed for assessing intraspecific variations. Global barcode database of the order Lepidoptera is available on BOLDSystems (http://www.boldsystems.org). It is regularly updated by submissions from all parts of the world. At the moment, BOLDSystems has 74,947 species with barcodes and 6, 70,267
To expose zoologists and Environmentalists to methodology of bioassessment of impacts of climatic and physiographic changes. To highlight Lepidoptera as one of the flagship group for such impact studies. To throw light on DNA Barcoding as a chief tool to be adopted for rapid bioassessment studies. To highlight mitochondrial genes – CO1, COII, nad1, nad4, nad5, nad6 and 16s rRNA, as the chief tools for diagnosis and delimitation of species, and to assess genetic divergence within species.
Order Lepidoptera of Class Insecta comprise the material for the present studies. Butterflies and moths will be collected by following their collection protocols; and two right legs will be excised from each sample and preserved in ethyl alcohol, labeled and stored in refrigerator for DNA Barcoding. DNA Barcoding is based on Mid region of the mitochondrial COI gene which is amplified through PCR by employing: - Universal Insect Specific Primers (Hebert, et. al., 2003) LCO : 5’-GGTCAACAAATCATAAAGATATTGG-3’, and HCO : 5’-TAAACTTCAGGGTGACCAAAAAATCA-3’ - Lepidoptera Specific Primers (Hajibabaei, et. al., 2006) LepF : 5-ATTCAACCAATCATAAAGATATTGG-3 , and LepR: (5 -TAAACTTCTGGATGTCCAAAAAATCA-3 , or Enh_Lep R1: 5 -CTCCWCCAGCAGGATCAAAA-3’ Intraspecific variations are studied by additional mitochondrial genes – nad1 (Miller, et.al., 2009), nad4 (Gomez, et.al.,2009, Liu, et. al., 2010 ), nad5 (Meraner, et.al., 2008), nad6 (Silva-Brandao, et. al., 2011), COII (Liu, et. al., 1992), and 16s rRNA (Raffiudin, et. al., 2011); and for their amplification, specific primers are used according to respective protocols. The sequences for the identified and described species are submitted along with collateral information including photograph to web-repositories (www.BOLDSystems.org; www.ncbi.nih.gov).These add into already existing database. Later, submission of sequences of unknown specimens helps in immediate arrival at the conclusion whether species is already known or novel to science and how much genetic closeness it has with different species. % divergence or genetic distances are estimated through multiple sequence alignment in MEGA version 5 software to delimit species, and to assess population variations within species.
Till majority Lepidopteran species are barcoded and submitted on global database, rapid identification of Lepidopterans vis-à-vis prompt bioassessment of impacts of climatic changes and physiographic changes is not possible. There is an urgent need for developing a comprehensive DNA barcode library for the Lepidopterans. As the rate of submissions is picking up pace and good amount of funds are being diverted by states to DNA Barcoding, rapid bioassessment of impacts on Lepidoptera will soon become reality. This will help in its effective conservation.
Thanks are due to Principal SGGS College, Chandigarh for allowing the author to attend and present this poster in the present conference. Sincere thanks are also due to Dr Virash Gupta (Professor in Microbiology; PAU, Ludhiana; for introduction to RAPD and Cloning) and Dr Sanil George (Scientist, Rajiv Gandhi Centre of Biotechnology, Trivandrum; for exposure to technique of Bar- coding) for respective reasons. Dr Jagbir Singh Kirti (Professor in Entomology, Punjabi University, Patiala), needs special thanks, as has been my real mentor during my research for doctorate degree.
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Figures DNA Barcoding DNA Barcode Chromatorogram Chromatogram (Magnified)