東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Mechanisms facilitating and evolutio...

Reagon, Michael.

Linked to FindBook

Google Book

Amazon

博客來

Mechanisms facilitating and evolutionary consequences of gene flow in two crop-wild hybrid complexes: Sunflower and rice.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Mechanisms facilitating and evolutionary consequences of gene flow in two crop-wild hybrid complexes: Sunflower and rice./
Author:	Reagon, Michael.
Description:	141 p.
Notes:	Adviser: Allison A. Snow.
Contained By:	Dissertation Abstracts International67-12B.
Subject:	Agriculture, Plant Culture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3244799

Mechanisms facilitating and evolutionary consequences of gene flow in two crop-wild hybrid complexes: Sunflower and rice.
Reagon, Michael.

Mechanisms facilitating and evolutionary consequences of gene flow in two crop-wild hybrid complexes: Sunflower and rice. - 141 p.

Adviser: Allison A. Snow.

Thesis (Ph.D.)--The Ohio State University, 2007.

Most of the world's crops hybridize where they co-occur with related wild species, yet the evolutionary consequences of this process remain poorly understood. The dispersal of genes from crops to their wild relatives can have important implications for agriculture, especially if crop genes persist in wild populations. For example, hybridization between crops and wild species has been linked to the evolution of more aggressive weeds. In contrast, extensive hybridization with endangered wild relatives could "swamp out" native genes, and displace valuable germplasm essential for future crop breeding. My dissertation focused on two aspects of crop-wild gene flow: (1) How does gene flow occur? and (2) How can germplasm materials maintained in wild relatives be conserved?Subjects--Topical Terms:

1018669
Agriculture, Plant Culture.

Mechanisms facilitating and evolutionary consequences of gene flow in two crop-wild hybrid complexes: Sunflower and rice.
LDR:03371nam 2200337 a 45 001 949120
005 20110525
008 110525s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3244799
035 $a AAI3244799
040 $a UMI $c UMI
100 1 $a Reagon, Michael. $3 1272501
245 1 0 $a Mechanisms facilitating and evolutionary consequences of gene flow in two crop-wild hybrid complexes: Sunflower and rice.
300 $a 141 p.
500 $a Adviser: Allison A. Snow.
500 $a Source: Dissertation Abstracts International, Volume: 67-12, Section: B, page: 6844.
502 $a Thesis (Ph.D.)--The Ohio State University, 2007.
520 $a Most of the world's crops hybridize where they co-occur with related wild species, yet the evolutionary consequences of this process remain poorly understood. The dispersal of genes from crops to their wild relatives can have important implications for agriculture, especially if crop genes persist in wild populations. For example, hybridization between crops and wild species has been linked to the evolution of more aggressive weeds. In contrast, extensive hybridization with endangered wild relatives could "swamp out" native genes, and displace valuable germplasm essential for future crop breeding. My dissertation focused on two aspects of crop-wild gene flow: (1) How does gene flow occur? and (2) How can germplasm materials maintained in wild relatives be conserved?
520 $a In chapter 2, I compared flowering times and other phenotypic traits of volunteers from both "normal" and "off-type" (multi-headed) crop plants with those of wild sunflowers. I observed sufficient overlap in flowering times to allow gene flow among the three plant types. My results suggest that both types of crop volunteers have the potential to act as conduits for gene exchange between cultivated and wild sunflowers.
520 $a In chapter 3, I used a matrix population modeling approach to identify parts of the sunflower lifecycle that are most influential in determining crop-wild gene flow. The model demonstrated that seed banks and large initial recipient population size strongly influence final crop allele frequencies. Most significantly, my results suggest the facility with which introgression of crop alleles occurs will be contingent on local conditions. Confinement strategies designed to limit the dispersal of transgenes may not be universally effective.
520 $a In chapter 4, I used microsatellite markers, along with Bayesian methods that consider recent fragmentation events, to develop an in situ conservation strategy for wild rice Oryza rufipogon in the Mekong Delta of Vietnam. O. rufipogon is currently common in the Mekong but rapid development could decrease availability of habitat. Estimates of genetic diversity and genealogical history were obtained by screening 378 individuals from 19 O. rufipogon populations (&sim;20 individuals per population). My analysis found that O. rufipogon populations were highly differentiated and gene flow among populations was limited.
590 $a School code: 0168.
650 4 $a Agriculture, Plant Culture. $3 1018669
650 4 $a Biology, Botany. $3 1017825
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Genetics. $3 1017730
650 4 $a Biology, Molecular. $3 1017719
690 $a 0307
690 $a 0309
690 $a 0329
690 $a 0369
690 $a 0479
710 2 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 67-12B.
790 $a 0168
790 1 0 $a Snow, Allison A., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3244799