Dissertation > Excellent graduate degree dissertation topics show

Study on Pericarp and Seed-coat Micro-morphology Characteristics of Lepidium with Its Related Genera from China and Analising Their Phylogenetic Relationship Based on ITS Sequence

Author: ZhengJiQing
Tutor: LiFaZeng
School: Shandong Normal University
Course: Botany
Keywords: Brassicaceae Lepidium pericarp micro-morphology seed-coat micro-morphology ITS gene sequence
CLC: Q943;Q949
Type: Master's thesis
Year: 2006
Downloads: 180
Quote: 0
Read: Download Dissertation

Abstract


The Brassicaceae has great economic value including many important cropplants that are grown as vegetables (Brassica, Raphanus) and sources of vegetableoils and condiments. The family includes many ornamentals and Chinese traditionalmedicine and so on. Arabidopsis thaliana, which is naturalized in China, has becomethe model organism in many fields of experimental biology.The Brassicaceae has been acknowledged as a natural taxon comprehensively forthe family is well defined by its cross corolla,stamens tetradynamous,silique orsiliqua,and so on.But there are stilI some problems among its tribes,subtribes andgenera. And because of the unclear of the genera delimition,there are many debateson the attaching of some species.So many work should be done to build a naturalsystem.Fruit morphology has great value in classification. This paper intend to providenew proofs by study on Pericarp and seed coat micro-morphology and analyzing ITSgene sequence.Light microscopes are used to examine fruit epidermal features such as the typeof stoma apparatus, the shape of epidermal cells and the anticlinal wall of 83 spiecesof 41 genera in 10 tribe of Brassicaceae from China. It is canculated and analysed thatthe data of the ratio between stoma’s length and wide, stoma density and stoma index.The results split the Brassicaceae into 12 types and indicate Trib. Lepidieae,Trib.Arabideae,Trib.Sisymbrieae and Trib.Euclidieae, Trib.Drabeae as polyphylogetictaxon. This paper suggests Trib.Matthioleae be put into Trib. Hesperideae. LepidiumCardaria and Thlaspi are near and Coronopus should be put into the Lepidium insteadof Cardaria. The results also indicate Capsella is near to Trib.Arabideae,and indicatethe relative of Nasturtium,Roroppa and Cardamine and support the relative of Arabisand Arabidopsis, Sisymbrium and Thellungiella. Camelina are near to genera ofTrib.Arabideae.Scaning electron microscopes are used to examine seed coat micro-morphologyof 65 species of 32 genera. The results split the Brassicaceae into 8 types. The resultssupports the idea of grouping Lepidium 3 sections and suggests Lepidium virginicumL. be upgradea as a section-Sect. Accumbentum F. Z. Li, J. Q. Zheng & Z. Y.Sun,sect. nov.. The experiments indicate Isatis is related with Tauscheria and alsoindicate the relative of Nasturtium and Roroppa,.Arabis and Arabidopsis are bothpolyphyletic and they should be apart into sections. This experiment supports thatCrucihimalaya and Olimarabidopsis are origined from Arabidopsis. Descurainia andBerteroella are obviously different other species of Trib.Sisymbrieae and C.microcarpa Crantz is near to Arabis and Arabidopsis.The ITS gene sequence of 38 species is distributed into 4 lineages, It alsosupports the idea of grouping Lepidium 3 sections and suggests Lepidium virginicumL. be upgradea as a section-Sect. Accumbentum F. Z. Li, J. Q. Zheng & Z. Y.Sun,sect. nov. The analysis indicates Coronopus Cardaria and Thlaspi are relatedwith Lepidium and supports Isatis and Tauscheria are both put into Trib. Sisymbrieaeby 《The Families And Genera of Angiosperms in China》. The experiment agreesCapsella has more related with Trib. Arabidieae than Trib. Lepidieae,so this papersuggest Capsella should be put into Arabidieae. This sequence also indicates Arabisand Arabidopsis are near and Trib. Sisymbrieae is near to Trib. Brassiceae. Theresults suggest Camelina should be put into Trib. Arabidieae. The sequence indicatesBrassica is related with Sisymbrium and whether Trib.Brassiceae is monophyletic isworth while to further study. Capsella and Camelina are assemble to near Arabis, sothey should be put into Trib. Arabidieae with character of Pericarp. The sequencedoes not support that Rorripa and Nasturtium are united one.The experiment suggests Berteroella should be apart from Trib. Sisymbrieae andbe upgraded from genus to tribe by pericarp and seed coat micro-morphology and ITSgene sequence.

Related Dissertations

  1. Isolation and Identification of Infectious Bronchitis Virus and Sequence Analysis of Its S1 Gene and N Gene,S852.65
  2. Pathogenic Mechanism of Invasion Associated Genes in Avian Pathogenic E. Coli Duck Isolate DE205B,S852.61
  3. Studies on the Taxonomy of Brassicaceae on the Pamirs of China,Q949
  4. Isolation、Characterization and HA、NA Genetic Analysis of Goose Avian Influenza Virus,S852.65
  5. Isolation, Differentiation, PCR Detection and B2L Gene Sequence Analysis of CPDV,S852.65
  6. Isolation、Identification and Molecular Epidemiology Characteristic of Newcastle Disease Virus Causing Clinical Disease in Geese,S858.33
  7. Research on the Biological Characteristics and Molecular Epidemiology of Newcastle Disease Virus Isolates,S852.65
  8. Study on Development Biology and Systematic Evolution of Some Species of Iris,Q941
  9. Systematic Studies on Partial Genera and Species of Brassicaceae from China,Q941
  10. Genotypic Variability in Sequences and Expression of LEA2/LEA3 Genes in Tibetan Hulless Barley, Hordeum Vulgare ssp. Vulgare, Associated with Resistance to Water Deficit,S512.3
  11. Experimental Study of Maca(Lepidium Meyenii Walp.) on Menopause Syndrome and Osteoporosis,R580
  12. Gene Mapping and Analysis of Candidate Genes in Three Chinese Families with Congenital Cataract,R776.1
  13. Studies on Population Genetic Diversity and Molecular Evolution of Thellungiella Salsuginea,Q943
  14. Cloning, Sequence Analysis and Study on Polymorphism of Horse DRD4 Gene,S821
  15. Study on N and M Gene of Avian Infectious Bronchitis Virus HN99 Strain,S852.65
  16. A Chinese Familial and Sporadic Cases with Congenital Fibrosis of the Extraocular Muscles: Clinical and Molecular Genetic Study,R777.4
  17. Study on the Biological and Molecular Biological Characteristics of AIV H9N2 Subtype from Duck and Its Rapid Diagnosis,S858.32
  18. Study on the Viral Nervous Necrosis in Grouper,S943
  19. The Study of GnRH Receptor in Digestive Tract of Rat,R329
  20. The Study on the Relationship between BRMS1 (Breast-cancer Suppressor1, BRMS1) and Breast Cancer Metastasis,R737.9
  21. Study on VLP (Virus-Like Particles) Vaccine of HIV-1 Based on the Prevalent HIV-1 Strains in China,R392

CLC: > Biological Sciences > Botany > The plant taxonomy (system botany )
© 2012 www.DissertationTopic.Net  Mobile