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Systematics and biogeography of West...

Raz, Lauren.

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Systematics and biogeography of West Indian Dioscoreaceae.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Systematics and biogeography of West Indian Dioscoreaceae./
Author:	Raz, Lauren.
Description:	189 p.
Notes:	Advisers: Gloria Coruzzi; Doug Daly.
Contained By:	Dissertation Abstracts International68-01B.
Subject:	Biology, Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3247383

Systematics and biogeography of West Indian Dioscoreaceae.
Raz, Lauren.

Systematics and biogeography of West Indian Dioscoreaceae. - 189 p.

Advisers: Gloria Coruzzi; Doug Daly.

Thesis (Ph.D.)--New York University, 2007.

The yam family (Dioscoreaceae) is represented in the West Indies (WI) by the genera Rajania L. (19 species) and Dioscorea L. (9 species). Rajania is endemic to the region and is characterized by its winged, single-seeded fruit (samara). Dioscorea L. s.s. is cosmopolitan in distribution (ca. 400 spp. total) and produces a six-seeded capsule. Samaras have also been documented in two Mexican endemic Dioscorea species. Herein, a phylogenetic framework is elaborated to test the systematic position of Rajania. DNA sequences from two chloroplast genes were sampled from 19 WI species plus 43 exemplar taxa representing global Dioscoreaceae diversity. The results of parsimony analyses indicate that Rajania is monophyletic and is sister to a wild, edible Dioscorea from SW Mexico, with capsular fruits. The WI Dioscoreaceae (including Rajania) comprise as many as five discrete lineages, suggesting five separate introductions to the islands, from South and Central America.Subjects--Topical Terms:

1017825
Biology, Botany.

Systematics and biogeography of West Indian Dioscoreaceae.
LDR:03228nam 2200313 a 45 001 974207
005 20110929
008 110929s2007 eng d
035 $a (UMI)AAI3247383
035 $a AAI3247383
040 $a UMI $c UMI
100 1 $a Raz, Lauren. $3 1298151
245 1 0 $a Systematics and biogeography of West Indian Dioscoreaceae.
300 $a 189 p.
500 $a Advisers: Gloria Coruzzi; Doug Daly.
500 $a Source: Dissertation Abstracts International, Volume: 68-01, Section: B, page: 0033.
502 $a Thesis (Ph.D.)--New York University, 2007.
520 $a The yam family (Dioscoreaceae) is represented in the West Indies (WI) by the genera Rajania L. (19 species) and Dioscorea L. (9 species). Rajania is endemic to the region and is characterized by its winged, single-seeded fruit (samara). Dioscorea L. s.s. is cosmopolitan in distribution (ca. 400 spp. total) and produces a six-seeded capsule. Samaras have also been documented in two Mexican endemic Dioscorea species. Herein, a phylogenetic framework is elaborated to test the systematic position of Rajania. DNA sequences from two chloroplast genes were sampled from 19 WI species plus 43 exemplar taxa representing global Dioscoreaceae diversity. The results of parsimony analyses indicate that Rajania is monophyletic and is sister to a wild, edible Dioscorea from SW Mexico, with capsular fruits. The WI Dioscoreaceae (including Rajania) comprise as many as five discrete lineages, suggesting five separate introductions to the islands, from South and Central America.
520 $a Chloroplast data are insufficient to resolve relationships within Rajania. Additional nucleotide characters from the 5S-non transcribed spacer (nuclear ribosomal DNA) were used in conjunction with rbcL to generate a Rajania phylogeny. The topology depicts four major clades that suggest a history of intra-Antillian vicariance beginning in the Eocene and continuing through the Miocene. Adaptation to karst is optimized as the ancestral state and adaptation to serpentine soil arose independently in three of the four clades.
520 $a Morphological diversity among the five Dioscoreaceae lineages in the WI is treated, with attention to diagnostic characters. Special emphasis is also placed on tuber morphology and pollen wall ornamentation, described here for the first time. Five different forms of exine ornamentation are described in Rajania, and three in Lychnostemon.
520 $a The results of the cpDNA analyses suggest two independent origins of the Dioscoreaceae samara. To further test this hypothesis, flowers and developing fruits representing the two samara-bearing lineages were examined in serial sections and compared anatomically. The data show that samara formation in the Mexican and WI species is achieved via unique modifications of their respective carpel tissues, a result consistent with the above phylogenetic hypothesis.
590 $a School code: 0146.
650 4 $a Biology, Botany. $3 1017825
650 4 $a Biology, Molecular. $3 1017719
690 $a 0307
690 $a 0309
710 2 0 $a New York University. $3 515735
773 0 $t Dissertation Abstracts International $g 68-01B.
790 $a 0146
790 1 0 $a Coruzzi, Gloria, $e advisor
790 1 0 $a Daly, Doug, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3247383