Chromosome morphology, number and behavior of some Arizona Plantago species

Persistent Link:
http://hdl.handle.net/10150/276649
Title:
Chromosome morphology, number and behavior of some Arizona Plantago species
Author:
Sherman, JoAnn Davis, 1955-
Issue Date:
1987
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Mitosis and meiosis of five Plantago species were analyzed. Plantago argyrea, P. patagonica and P. wrightiana contain 2n = 20 chromosomes and P. rhodosperma and P. virginica 2n = 24 chromosomes. Similar modes of evolution of the karyotypes of the 2n = 20 species are suggested. All species are presumed to be tetraploid, arising from 2n = 10 and 2n = 12 ancestors. Structural changes in the karyotype of 2n = 12 species could produce one or more large chromosomes resulting in a decrease in chromosomes from 6 to 5. Consequently, chromosome lengths in 2n = 10 and derived 2n = 20 species could be increased by addition of repetitive DNA along the length of each chromosome to maintain chromosome field. Chromosomes of 2n = 24 species are more symmetrical and presumably more primitive than the 2n = 20 species. Chiasma frequencies in meiotic cells of all five species are similar. This suggests that the majority of changes DNA content are in repetitive DNA.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Plantago -- Genetics.; Plant genetics -- Arizona.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Plant Sciences
Degree Grantor:
University of Arizona
Advisor:
Ramage, Robert T.; Briggs, Robert E.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleChromosome morphology, number and behavior of some Arizona Plantago speciesen_US
dc.creatorSherman, JoAnn Davis, 1955-en_US
dc.contributor.authorSherman, JoAnn Davis, 1955-en_US
dc.date.issued1987en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractMitosis and meiosis of five Plantago species were analyzed. Plantago argyrea, P. patagonica and P. wrightiana contain 2n = 20 chromosomes and P. rhodosperma and P. virginica 2n = 24 chromosomes. Similar modes of evolution of the karyotypes of the 2n = 20 species are suggested. All species are presumed to be tetraploid, arising from 2n = 10 and 2n = 12 ancestors. Structural changes in the karyotype of 2n = 12 species could produce one or more large chromosomes resulting in a decrease in chromosomes from 6 to 5. Consequently, chromosome lengths in 2n = 10 and derived 2n = 20 species could be increased by addition of repetitive DNA along the length of each chromosome to maintain chromosome field. Chromosomes of 2n = 24 species are more symmetrical and presumably more primitive than the 2n = 20 species. Chiasma frequencies in meiotic cells of all five species are similar. This suggests that the majority of changes DNA content are in repetitive DNA.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectPlantago -- Genetics.en_US
dc.subjectPlant genetics -- Arizona.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplinePlant Sciencesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorRamage, Robert T.en_US
dc.contributor.advisorBriggs, Robert E.en_US
dc.identifier.proquest1332978en_US
dc.identifier.oclc20059635en_US
dc.identifier.bibrecord.b16916384en_US
dc.identifier.bibrecord.b16916372en_US
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