Evolutionary Processes Involved in the Emergence and Expansion of an Atypical O. sativa Group in Madagascar
Autor: | João D. Santos, Julien Frouin, Nourollah Ahmadi, Alain Ramanantsoanirina, Tendro Radanielina |
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Přispěvatelé: | Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre National de Recherche Appliquée au Développement Rural (FOFIFA), Université d'Antananarivo, AGROPOLIS Fondation 0900-001-1 |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
0106 biological sciences
0301 basic medicine Sympatry [SDV.SA]Life Sciences [q-bio]/Agricultural sciences Old World Soil Science Oryza sativa Plant Science Evolutionary process 01 natural sciences Japonica SB1-1110 03 medical and health sciences parasitic diseases Madagascar Domestication 2. Zero hunger Genetic diversity Diversity biology Haplotype Plant culture food and beverages 15. Life on land biology.organism_classification 030104 developmental biology Evolutionary biology Original Article Rice Adaptation Agronomy and Crop Science 010606 plant biology & botany |
Zdroj: | Rice Rice, Springer Open, 2021, 14 (1), ⟨10.1186/s12284-021-00479-8⟩ Rice, Vol 14, Iss 1, Pp 1-18 (2021) |
ISSN: | 1939-8425 1939-8433 |
Popis: | Understanding crops genetic diversity and the evolutionary processes that accompanied their world-wide spread is useful for designing effective breeding strategies. Madagascar Island was one of the last major Old World areas where human settlement was accompanied by the introduction of Oryza sativa. Early studies had reported the presence in the island of a rice group specific to Madagascar. Using 24K SNP, we compared diversity patterns at the whole genome and at haplotypes (30 SNP-long segments along the genome) levels, between 620 Malagasy and 1,929 Asian rice accessions. The haplotypes level analysis aimed at identifying local genotypic variations, relative to the whole genome level, using a group assignment method that relies on kernel density estimation in a Principal Component Analysis feature space. Migration bottleneck had resulted in 10–25% reduction of diversity among the Malagasy representatives of indica (G1) and japonica (G6) populations. Compared to their Asian counterpart, G1 and G6 showed slightly lower indica and japonica introgressions, suggesting the latter population had undergone less recombinations when migration to the island occurred. The origins of G1 and G6 was delineated to XI-2 indica subpopulation from the Indian subcontinent and to tropical japonica from the Malay Archipelago, respectively. The Malagasy-specific group (Gm) had a rather high gene diversity and an original haplotype pattern: much lower share of indica haplotypes, and much higher share of Aus and japonica haplotypes than G1 and indica. Its emergence and expansion are most probably due to inter-group recombination facilitated by sympatry between indica-cAus admixes and “Bulu” type landraces of G6 in the highlands of Madagascar, and to human selection for adaptation to the lowland ecosystems of the highlands. Pattern of rice genetic diversity was also tightly associated with the history of human settlement in the island. Emergence of the Gm group is associated with the latest arrivals of Austronesians, who founded the Merina kingdom in the central highlands and developed lowland rice cultivation. As an intermediary form between Aus, indica and japonica, the three pillars of O. sativa domestication, Gm represents a very valuable genetic resource in breeding for adaptation to cold tolerance in tropical highlands. |
Databáze: | OpenAIRE |
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