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Genetics and evolution of reproducti...

Jewell, Cathleen P.

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Genetics and evolution of reproductive behavior in Solanaceae.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Genetics and evolution of reproductive behavior in Solanaceae./
Author:	Jewell, Cathleen P.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	219 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
Contained By:	Dissertation Abstracts International78-01B(E).
Subject:	Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10131686
ISBN:	9781339894577

Genetics and evolution of reproductive behavior in Solanaceae.
Jewell, Cathleen P.

Genetics and evolution of reproductive behavior in Solanaceae. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 219 p.

Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.

Thesis (Ph.D.)--Indiana University, 2016.

For sexually reproducing organisms, the origin of new species involves the evolution of reproductive isolating barriers between diverging lineages. Reproductive isolating barriers may act prior to mating (premating prezygotic isolation) to prevent mating events from occurring, after mating but prior to fertilization (postmating prezygotic isolation) to prevent hybrid zygotes from forming, or after fertilization (postzygotic isolation) in the form of reduced hybrid fitness. Examining the effects of these barriers individually and in combination can provide insight into the evolutionary forces and genetic mechanisms responsible for the emergence of new, reproductively independent, lineages during the process of speciation. However, the accumulation of these isolating barriers, as well as their underlying genetics, is poorly understood in most systems. My research addresses these questions by: first, quantifying the relative contributions of reproductive isolating barriers and determine the underlying genetics of these barriers; and, second, determining the extent to which intraspecific self-incompatibility, a known reproductive behavior that affects identity of mating partners, influences the expression of interspecific barriers. In Chapter 2, I assess 4 postmating barriers and quantify their contributions to isolation among 11 species of Nolana; I show that postzygotic barriers have stronger effects and evolve faster than prezygotic barriers. In Chapter 3, I examine one postmating, prezygotic barrier, unilateral incompatibility (UI), between two species of Solanum sect. Lycopersicon. Using a genetic mapping approach, I show that the genetic architecture of self-incompatibility directly influences the expression of UI. In Chapter 4, I further assess the genetic association between UI and self-incompatibility, but between two populations within a single species of Solanum; I show that loci controlling natural variation in mate choice within species can also directly affect interspecific isolation. Both Chapters 3 and 4 indicate that the genetic mechanisms of these two reproductive behaviors overlap. In Chapter 5, I characterize gamete recognition in the wild tomato clade, and quantify how dysfunctional gamete chemical signaling contributes to a previously overlooked postmating prezygotic barrier---gamete isolation---between species in this clade. Overall, this work has broad implications in evolutionary and ecological genetics, plant reproductive behavior, and agricultural sciences.

ISBN: 9781339894577Subjects--Topical Terms:

516217
Botany.

Genetics and evolution of reproductive behavior in Solanaceae.
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520 $a For sexually reproducing organisms, the origin of new species involves the evolution of reproductive isolating barriers between diverging lineages. Reproductive isolating barriers may act prior to mating (premating prezygotic isolation) to prevent mating events from occurring, after mating but prior to fertilization (postmating prezygotic isolation) to prevent hybrid zygotes from forming, or after fertilization (postzygotic isolation) in the form of reduced hybrid fitness. Examining the effects of these barriers individually and in combination can provide insight into the evolutionary forces and genetic mechanisms responsible for the emergence of new, reproductively independent, lineages during the process of speciation. However, the accumulation of these isolating barriers, as well as their underlying genetics, is poorly understood in most systems. My research addresses these questions by: first, quantifying the relative contributions of reproductive isolating barriers and determine the underlying genetics of these barriers; and, second, determining the extent to which intraspecific self-incompatibility, a known reproductive behavior that affects identity of mating partners, influences the expression of interspecific barriers. In Chapter 2, I assess 4 postmating barriers and quantify their contributions to isolation among 11 species of Nolana; I show that postzygotic barriers have stronger effects and evolve faster than prezygotic barriers. In Chapter 3, I examine one postmating, prezygotic barrier, unilateral incompatibility (UI), between two species of Solanum sect. Lycopersicon. Using a genetic mapping approach, I show that the genetic architecture of self-incompatibility directly influences the expression of UI. In Chapter 4, I further assess the genetic association between UI and self-incompatibility, but between two populations within a single species of Solanum; I show that loci controlling natural variation in mate choice within species can also directly affect interspecific isolation. Both Chapters 3 and 4 indicate that the genetic mechanisms of these two reproductive behaviors overlap. In Chapter 5, I characterize gamete recognition in the wild tomato clade, and quantify how dysfunctional gamete chemical signaling contributes to a previously overlooked postmating prezygotic barrier---gamete isolation---between species in this clade. Overall, this work has broad implications in evolutionary and ecological genetics, plant reproductive behavior, and agricultural sciences.
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