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Comparative structure, development a...

Soros, Connie Lynn.

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Comparative structure, development and evolution of photosynthetic tissues in C(3) and C(4) cyperaceae.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Comparative structure, development and evolution of photosynthetic tissues in C(3) and C(4) cyperaceae./
Author:	Soros, Connie Lynn.
Description:	240 p.
Notes:	Source: Dissertation Abstracts International, Volume: 61-01, Section: B, page: 0038.
Contained By:	Dissertation Abstracts International61-01B.
Subject:	Biology, Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ45651
ISBN:	061245651X

Comparative structure, development and evolution of photosynthetic tissues in C(3) and C(4) cyperaceae.
Soros, Connie Lynn.

Comparative structure, development and evolution of photosynthetic tissues in C(3) and C(4) cyperaceae. - 240 p.

Source: Dissertation Abstracts International, Volume: 61-01, Section: B, page: 0038.

Thesis (Ph.D.)--University of Toronto (Canada), 1999.

C4 Cyperaceae have an unusual version of 'Kranz' anatomy with cell layer(s) intervening between PCA and PCR tissues. Relative abundance of tissue types in mature leaves of Cyperaceae were quantified and compared to the Poaceae. Absolute distances between PCA and PCR tissues indicate that the extra layers in the Cyperaceae do not increase the length of the diffusion pathway required for efficient metabolite transfer. The greater proportion of intercellular space within PCA tissue in the Cyperaceae may have played a role in the evolution of PCR tissue in the unique position of inner border parenchyma. Identification of the zones of leaf extension, cell division, elongation, and differentiation in developing leaves of Cyperus eragrostis indicate that the morphological pattern of leaf development is similar to, but more condensed than, that found in the Poaceae. A study of ontogenetic derivation of photosynthetic tissues in C4 Cyperaceae found that PCR cells are derived from procambium and are usually homologous to inner border parenchyma cells of C3 vascular tissue, unlike C4 grasses. Results indicate that key developmental signals for cell determination are positional. The position of PCR cells may be a consequence of evolutionary selection for a position that isolates them from greater intercellular space present as a result of adaptation to wet habitats by the Cyperaceae. A study of the differentiation of photosynthetic tissues and the immunolocalization of photosynthetic enzymes resulted in finding differences in the spatial and temporal coordination of photosynthetic tissue differentiation in C4 Cyperaceae and Poaceae. Development, distribution and evolutionary history of C4 photosynthesis in the Cyperaceae were addressed in a study that mapped C4 photosynthetic types onto existing phylogenies and correlated patterns with developmental history. Cladistic analyses indicate that the C4 pathway has evolved at least four times in the Cyperaceae, with variations on a general developmental pattern different from that found in other C4 families, reflecting homoplasies both within and between families. These results indicate that multiple functional and environmental selective pressures operating on different C3 ancestors have resulted in different versions of C4 anatomy and biochemistry in different plant families while key elements of C4 anatomy are universally present.

ISBN: 061245651XSubjects--Topical Terms:

1017825
Biology, Botany.

Comparative structure, development and evolution of photosynthetic tissues in C(3) and C(4) cyperaceae.
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245 1 0 $a Comparative structure, development and evolution of photosynthetic tissues in C(3) and C(4) cyperaceae.
300 $a 240 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-01, Section: B, page: 0038.
500 $a Adviser: Nancy G. Deugler.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 1999.
520 $a C4 Cyperaceae have an unusual version of 'Kranz' anatomy with cell layer(s) intervening between PCA and PCR tissues. Relative abundance of tissue types in mature leaves of Cyperaceae were quantified and compared to the Poaceae. Absolute distances between PCA and PCR tissues indicate that the extra layers in the Cyperaceae do not increase the length of the diffusion pathway required for efficient metabolite transfer. The greater proportion of intercellular space within PCA tissue in the Cyperaceae may have played a role in the evolution of PCR tissue in the unique position of inner border parenchyma. Identification of the zones of leaf extension, cell division, elongation, and differentiation in developing leaves of Cyperus eragrostis indicate that the morphological pattern of leaf development is similar to, but more condensed than, that found in the Poaceae. A study of ontogenetic derivation of photosynthetic tissues in C4 Cyperaceae found that PCR cells are derived from procambium and are usually homologous to inner border parenchyma cells of C3 vascular tissue, unlike C4 grasses. Results indicate that key developmental signals for cell determination are positional. The position of PCR cells may be a consequence of evolutionary selection for a position that isolates them from greater intercellular space present as a result of adaptation to wet habitats by the Cyperaceae. A study of the differentiation of photosynthetic tissues and the immunolocalization of photosynthetic enzymes resulted in finding differences in the spatial and temporal coordination of photosynthetic tissue differentiation in C4 Cyperaceae and Poaceae. Development, distribution and evolutionary history of C4 photosynthesis in the Cyperaceae were addressed in a study that mapped C4 photosynthetic types onto existing phylogenies and correlated patterns with developmental history. Cladistic analyses indicate that the C4 pathway has evolved at least four times in the Cyperaceae, with variations on a general developmental pattern different from that found in other C4 families, reflecting homoplasies both within and between families. These results indicate that multiple functional and environmental selective pressures operating on different C3 ancestors have resulted in different versions of C4 anatomy and biochemistry in different plant families while key elements of C4 anatomy are universally present.
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