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Title: Cytogenetic investigations on some members of family Coreidae (Insecta: Hemiptera: Heteroptera)
Researcher: Bansal, Nidhi
Guide(s): Harbhajan Kaur
Keywords: Zoology
Upload Date: 6-Dec-2013
University: Punjabi University
Completed Date: 2012
Abstract: The Heteroptera is a highly diverse insect suborder with approximately 42,300 described species separated into 7 infraorders and 89 families. Pentatomidae, Coreidae, Lygaeidae, Reduviidae and Miridae are some of its major families. The family Coreidae includes 2200 species belonging to 500 genera. Being phytophagous, members of this family cause significant damage to grains, legumes, cucurbit crops, soft fruits and nuts. Coreidae is divided into 4 subfamilies: Coreinae, Pseudophloeinae, Meropachydinae and Agriopocorinae. Coreinae is distributed worldwide but is the most abundant in tropics. Pseudophloeinae is found predominantly in the Old World. Meropachydinae and Agriopocorinae are rarely found and only a few genera for each subfamily are known. newlineHeteropterans are characterized by holokinetic chromosomes, multiple sex chromosome systems (e.g., Xn0, XnY, XYn and XnYn) and post-reductional division of sex chromosomes during male meiosis. Coreidae, besides having heteropteran features, posseses a pair of icrochromosomes and lack Y chromosome with few exceptions. So far, 120 species of Coreidae are cytogenetically known worldwide. From India, only 33 species have been cytogenetically analyzed and that, too, in 1960 s. Inspite of a very important group, no significant cytological work has been carried out subsequently. Moreover, most of the studies pertain to only the diploid chromosome complement and course of meiosis. Detailed cytogenetic studies involving distribution of constitutive heterochromatin, sequence specificity and nucleolar organizer regions are negligible. Keeping in mind the economic importance of Coreidae and scarcity of knowledge on cytogenetic aspects of this family, the present study was undertaken to carry out comprehensive work on Coreid bugs to study normal chromosomal complement, course of meiosis, distribution and base composition of constitutive heterochromatin and localization of nucleolar organizing regions.
Pagination: 189p.
Appears in Departments:Department of Zoology

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01_title.pdfAttached File99.15 kBAdobe PDFView/Open
02_certificate.pdf341.93 kBAdobe PDFView/Open
03_declaration.pdf321.86 kBAdobe PDFView/Open
04_acknowledgements.pdf38.2 kBAdobe PDFView/Open
05_abstract.pdf140.89 kBAdobe PDFView/Open
06_contents.pdf139.23 kBAdobe PDFView/Open
07_chapter 1.pdf225.36 kBAdobe PDFView/Open
08_chapter 2.pdf270.26 kBAdobe PDFView/Open
09_chapter 3.pdf294.74 kBAdobe PDFView/Open
10_chapter 4.pdf314.32 kBAdobe PDFView/Open
11_chapter 5.pdf231.65 kBAdobe PDFView/Open
12_summary.pdf203.28 kBAdobe PDFView/Open
13_references.pdf324.41 kBAdobe PDFView/Open
14_appendix.pdf47.29 MBAdobe PDFView/Open

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