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Genetic analysis of KANADI, Class III HD -ZIP, and Defective Embryo and Meristems function in Arabidopsis thaliana.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Genetic analysis of KANADI, Class III HD -ZIP, and Defective Embryo and Meristems function in Arabidopsis thaliana./
Author:	Hawker, Nathaniel Patrick.
Description:	1 online resource (87 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 67-04, Section: B.
Contained By:	Dissertations Abstracts International67-04B.
Subject:	Genetics. -
Online resource:	click for full text (PQDT)
ISBN:	9780496950676

Genetic analysis of KANADI, Class III HD -ZIP, and Defective Embryo and Meristems function in Arabidopsis thaliana.
Hawker, Nathaniel Patrick.

Genetic analysis of KANADI, Class III HD -ZIP, and Defective Embryo and Meristems function in Arabidopsis thaliana. - 1 online resource (87 pages)

Source: Dissertations Abstracts International, Volume: 67-04, Section: B.

Thesis (Ph.D.)--University of California, Davis, 2004.

Includes bibliographical references

The overall theme of this dissertation has been to elucidate how specific genetic pathways establish basic patterns in plant development. Meristems within the plant body differ in their structure and the patterns and identities of organs they produce. Despite these differences, it is becoming apparent that shoot and root apical and vascular meristems share significant gene expression patterns. Class III HD-Zip genes are required for the formation of a functional shoot apical meristem. In addition, Class III HD-Zip and KANADI genes function in patterning lateral organs and vascular bundles produced from the shoot apical and vascular meristems respectively. We utilize both gain- and loss-of-function mutants and gene expression patterns to analyze the function of Class III HD-Zip and KANADI genes. Our studies show that both Class III HD-Zip and KANADI genes play roles in the ontogeny of lateral roots and suggest that Class III HD-Zip gene activity is required for meristematic activity in the pericycle analogous to its requirement in the shoot apical meristem. In lateral organs produced by the shoot, we show that juxtaposition of Class III HD-Zip and KANADI function is required for establishment of adaxial to abaxial polarity and initiation of lamina. Additionally, laminar outgrowth requires the function of YABBY putative transcription factors. In addition to genetic programs that regulate meristem size or function, genes that function in all dividing cells such as cyclin-dependent kinases, cyclins, and histones are also expressed in meristems. One might expect that mutations in genes involved in cell cycle progression or cell division would affect all developmental events requiring cell division, including gametogenesis, whereas mutations in meristem identity genes may be more restricted in their phenotypic defects. Our analysis of loss-of-function DEFECTIVE EMBRYO AND MERISTEMS alleles shows that these genes are required for proper control of progression through the cell cycle during gametophyte development. Additionally, our in situ hybridization data suggest that this function is conserved throughout sporophyte development.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9780496950676Subjects--Topical Terms:

578972
Genetics.
Subjects--Index Terms:

Class III HD-ZIPIndex Terms--Genre/Form:

554714
Electronic books.

Genetic analysis of KANADI, Class III HD -ZIP, and Defective Embryo and Meristems function in Arabidopsis thaliana.
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245 1 0 $a Genetic analysis of KANADI, Class III HD -ZIP, and Defective Embryo and Meristems function in Arabidopsis thaliana.
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504 $a Includes bibliographical references
520 $a The overall theme of this dissertation has been to elucidate how specific genetic pathways establish basic patterns in plant development. Meristems within the plant body differ in their structure and the patterns and identities of organs they produce. Despite these differences, it is becoming apparent that shoot and root apical and vascular meristems share significant gene expression patterns. Class III HD-Zip genes are required for the formation of a functional shoot apical meristem. In addition, Class III HD-Zip and KANADI genes function in patterning lateral organs and vascular bundles produced from the shoot apical and vascular meristems respectively. We utilize both gain- and loss-of-function mutants and gene expression patterns to analyze the function of Class III HD-Zip and KANADI genes. Our studies show that both Class III HD-Zip and KANADI genes play roles in the ontogeny of lateral roots and suggest that Class III HD-Zip gene activity is required for meristematic activity in the pericycle analogous to its requirement in the shoot apical meristem. In lateral organs produced by the shoot, we show that juxtaposition of Class III HD-Zip and KANADI function is required for establishment of adaxial to abaxial polarity and initiation of lamina. Additionally, laminar outgrowth requires the function of YABBY putative transcription factors. In addition to genetic programs that regulate meristem size or function, genes that function in all dividing cells such as cyclin-dependent kinases, cyclins, and histones are also expressed in meristems. One might expect that mutations in genes involved in cell cycle progression or cell division would affect all developmental events requiring cell division, including gametogenesis, whereas mutations in meristem identity genes may be more restricted in their phenotypic defects. Our analysis of loss-of-function DEFECTIVE EMBRYO AND MERISTEMS alleles shows that these genes are required for proper control of progression through the cell cycle during gametophyte development. Additionally, our in situ hybridization data suggest that this function is conserved throughout sporophyte development.
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650 4 $a Molecular biology. $3 583443
650 4 $a Botany. $3 599558
653 $a Class III HD-ZIP
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653 $a KANADI
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