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Molecular Adaptation and Geographic ...

Alam, Ornob,

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Molecular Adaptation and Geographic Spread of the Earliest Domesticated Rice in Asia /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Molecular Adaptation and Geographic Spread of the Earliest Domesticated Rice in Asia // Ornob Alam.
Author:	Alam, Ornob,
Description:	1 electronic resource (287 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
Subject:	Biology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31933053
ISBN:	9798286424207

Molecular Adaptation and Geographic Spread of the Earliest Domesticated Rice in Asia /
Alam, Ornob,

Molecular Adaptation and Geographic Spread of the Earliest Domesticated Rice in Asia /Ornob Alam. - 1 electronic resource (287 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

Rice (Oryza sativa) was first domesticated beginning ~9,000 years ago in China as subspecies japonica, and subsequently spread to Northeast, Southeast, and South Asia starting from about 4,000 to 5,000 years. The timeline of its dispersal is linked to migration of and trade between major human cultures and the evolution of agricultural systems across Asia. First, using newly sequenced indigenous landraces from Taiwan and the Philippines, we investigate the route of spread of rice to Island Southeast Asia, and the possible role of Out-of-Taiwan human migration in this movement. We find that rice arrived in Island Southeast about 3,000 years ago from Mainland Southeast Asia. Taiwanese landraces appear to belong to two distinct admixed populations sharing ancestry with temperate japonica from Northeast Asia, and tropical japonica from Mainland Southeast Asia and Island Southeast Asia, respectively, suggesting that Taiwan has acted as a contact zone between Northeast Asia to its north and/west, and Southeast Asia to its south. Next, incorporating data from 47 newly resequenced japonica rice herbarium specimens collected over the last 167 years, and 42 resequenced japonica landraces that were recently published, we reconstruct in finer resolution than in previous work how japonica rice moved from its center of origin to other parts of Asia beginning ~4,000-5,000 years ago, finding evidence for population structure and diversification within China. We observe an enrichment of pathogen resistance loci in selective sweeps associated with distinct geographic populations, suggesting that biotic interactions may be a key driver of local adaptation. We also find that the majority of 76 functional mutations associated with japonica rice domestication and diversification - including those that may be important for modern breeding - had their origins in the Pleistocene >11,700 years ago, suggesting a key role for selection on standing variation in the history of domesticated rice. Reconstructed allele frequency trajectories indicate that historical frequency increases of alleles linked to several functional traits were associated with key domestication/diversification events.

English

ISBN: 9798286424207Subjects--Topical Terms:

522710
Biology.
Subjects--Index Terms:

Crop diversification

Molecular Adaptation and Geographic Spread of the Earliest Domesticated Rice in Asia /
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520 $a Rice (Oryza sativa) was first domesticated beginning ~9,000 years ago in China as subspecies japonica, and subsequently spread to Northeast, Southeast, and South Asia starting from about 4,000 to 5,000 years. The timeline of its dispersal is linked to migration of and trade between major human cultures and the evolution of agricultural systems across Asia. First, using newly sequenced indigenous landraces from Taiwan and the Philippines, we investigate the route of spread of rice to Island Southeast Asia, and the possible role of Out-of-Taiwan human migration in this movement. We find that rice arrived in Island Southeast about 3,000 years ago from Mainland Southeast Asia. Taiwanese landraces appear to belong to two distinct admixed populations sharing ancestry with temperate japonica from Northeast Asia, and tropical japonica from Mainland Southeast Asia and Island Southeast Asia, respectively, suggesting that Taiwan has acted as a contact zone between Northeast Asia to its north and/west, and Southeast Asia to its south. Next, incorporating data from 47 newly resequenced japonica rice herbarium specimens collected over the last 167 years, and 42 resequenced japonica landraces that were recently published, we reconstruct in finer resolution than in previous work how japonica rice moved from its center of origin to other parts of Asia beginning ~4,000-5,000 years ago, finding evidence for population structure and diversification within China. We observe an enrichment of pathogen resistance loci in selective sweeps associated with distinct geographic populations, suggesting that biotic interactions may be a key driver of local adaptation. We also find that the majority of 76 functional mutations associated with japonica rice domestication and diversification - including those that may be important for modern breeding - had their origins in the Pleistocene >11,700 years ago, suggesting a key role for selection on standing variation in the history of domesticated rice. Reconstructed allele frequency trajectories indicate that historical frequency increases of alleles linked to several functional traits were associated with key domestication/diversification events.
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