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Molecular systematics and chloroplas...

Stefanovic, Sasa.

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Molecular systematics and chloroplast genome evolution of Convolvulaceae.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Molecular systematics and chloroplast genome evolution of Convolvulaceae./
作者:	Stefanovic, Sasa.
面頁冊數:	162 p.
附註:	Chair: Richard G. Olmstead.
Contained By:	Dissertation Abstracts International63-08B.
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063022
ISBN:	0493815651

Molecular systematics and chloroplast genome evolution of Convolvulaceae.
Stefanovic, Sasa.

Molecular systematics and chloroplast genome evolution of Convolvulaceae. - 162 p.

Chair: Richard G. Olmstead.

Thesis (Ph.D.)--University of Washington, 2002.

The Convolvulaceae are one of the few angiosperm families showing substantial structural differences in the chloroplast genome. This is even more intriguing considering that the sister family, Solanaceae, has virtually no rearrangements and represents a typical chloroplast genome. The only parasitic genus of this family, <italic>Cuscuta</italic>, has been the subject of extensive molecular analysis. The findings on chloroplast genome structural rearrangements in this genus were attributed to parasitism, but without proper comparison to related non-parasitic members of the family. The phylogenetic problems within the family need to be resolved satisfactorily before molecular evolutionary questions can be answered. In order to circumscribe the family and assess the relationships among its major lineages, a broad data set was constructed containing representatives of all ten recognized tribes of Convolvulaceae plus representatives of putatively related families within Asteridae. This is done by using a new molecular data set consisting of chloroplast (<italic> rbcL, atpB, rpl2, trnL-F</italic> and <italic>psbE-J</italic>), mitochondrial (<italic>atpA</italic>), and nuclear (<italic>RPB2</italic>) DNA sequences. The results indicate that Convolvulaceae are monophyletic and sister to Solanaceae. Two of the three groups that have been proposed previously as separate families, <italic> Cuscuta</italic> and Dichondreae, are nested within the Convolvulaceae, and the third, <italic>Humbertia</italic>, is the sister to all other members of the family. Phylogenetic studies identified several distinct monophyletic groups, some of which correspond to earlier taxonomic treatments (e.g., close relationships of tribes Hildebrandtieae with Cresseae and Ipomoeeae with Argyreieae). The polyphyly of Merremieae, Convolvuleae, Poraneae, and Erycibeae is first reported here. A formal phylogenetic classification is proposed and the analytical key to twelve tribes of Convolvulaceae is offered. Molecular data have been used successfully in some previous studies to elucidate the relationships of parasitic taxa. However, even though many alternatives were tested and rejected with confidence, the exact sister group of <italic>Cuscuta</italic> could not be ascertained. The phylogenetic approach revealed that many of the changes in the chloroplast genome in <italic>Cuscuta</italic>, previously attributed to parasitism, could be rather explained either as a plesiomorphic condition within the family, i.e., condition shared with the rest of the Convolvulaceae, or autapomorphies of particular <italic>Cuscuta</italic> taxa, not shared with the rest of the species in the genus.

ISBN: 0493815651Subjects--Topical Terms:

1017825
Biology, Botany.

Molecular systematics and chloroplast genome evolution of Convolvulaceae.
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520 $a The Convolvulaceae are one of the few angiosperm families showing substantial structural differences in the chloroplast genome. This is even more intriguing considering that the sister family, Solanaceae, has virtually no rearrangements and represents a typical chloroplast genome. The only parasitic genus of this family, <italic>Cuscuta</italic>, has been the subject of extensive molecular analysis. The findings on chloroplast genome structural rearrangements in this genus were attributed to parasitism, but without proper comparison to related non-parasitic members of the family. The phylogenetic problems within the family need to be resolved satisfactorily before molecular evolutionary questions can be answered. In order to circumscribe the family and assess the relationships among its major lineages, a broad data set was constructed containing representatives of all ten recognized tribes of Convolvulaceae plus representatives of putatively related families within Asteridae. This is done by using a new molecular data set consisting of chloroplast (<italic> rbcL, atpB, rpl2, trnL-F</italic> and <italic>psbE-J</italic>), mitochondrial (<italic>atpA</italic>), and nuclear (<italic>RPB2</italic>) DNA sequences. The results indicate that Convolvulaceae are monophyletic and sister to Solanaceae. Two of the three groups that have been proposed previously as separate families, <italic> Cuscuta</italic> and Dichondreae, are nested within the Convolvulaceae, and the third, <italic>Humbertia</italic>, is the sister to all other members of the family. Phylogenetic studies identified several distinct monophyletic groups, some of which correspond to earlier taxonomic treatments (e.g., close relationships of tribes Hildebrandtieae with Cresseae and Ipomoeeae with Argyreieae). The polyphyly of Merremieae, Convolvuleae, Poraneae, and Erycibeae is first reported here. A formal phylogenetic classification is proposed and the analytical key to twelve tribes of Convolvulaceae is offered. Molecular data have been used successfully in some previous studies to elucidate the relationships of parasitic taxa. However, even though many alternatives were tested and rejected with confidence, the exact sister group of <italic>Cuscuta</italic> could not be ascertained. The phylogenetic approach revealed that many of the changes in the chloroplast genome in <italic>Cuscuta</italic>, previously attributed to parasitism, could be rather explained either as a plesiomorphic condition within the family, i.e., condition shared with the rest of the Convolvulaceae, or autapomorphies of particular <italic>Cuscuta</italic> taxa, not shared with the rest of the species in the genus.
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