1. Cardinal temperatures variability within a tropical japonica rice diversity panel
- Author
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Rouan, Lauriane, Audebert, Alain, Luquet, Delphine, Roques, Sandrine, Dardou, Audrey, Gozé, Eric, Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-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), Université de Montpellier (UM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Agroécologie et Intensification Durables des cultures annuelles (UPR AIDA), and CIRAD thematic action ORYTAGE
- Subjects
Intéraction génotype environnement ,P40 - Météorologie et climatologie ,[SDV]Life Sciences [q-bio] ,Oryza sativa ,base temperature ,crop model ,leaf growth ,hierarchical modeling ,error propagation ,F62 - Physiologie végétale - Croissance et développement ,lcsh:Plant culture ,Facteur climatique ,F30 - Génétique et amélioration des plantes ,Variation génétique ,[SDV.BV]Life Sciences [q-bio]/Vegetal Biology ,lcsh:SB1-1110 ,Croissance ,Changement climatique ,Feuille ,Surface foliaire ,food and beverages ,Température ,Provenance - Abstract
International audience; Air temperature is one of the most critical climatic factors controlling rice growth, development, and production in current and future climatic scenarii predicting increasingly frequent situations of extreme and/or fluctuating temperatures. With its large spectrum of geographical origins and cropping areas, one can credit tropical japonica rice subspecies of a probable genetic diversity of its response to air temperature, which is of major interest for the breeding of better adapted rice varieties. A panel of 195 rice accessions (175 japonica plus 20 reference cultivars) was studied in controlled environment to estimate cardinal (base, optimum, and maximum) temperatures based on the monitoring of the elongation rate (LERmax) of the sixth leaf on the main stem in response to six fixed thermal treatments ranging from 16 to 35 degrees C. A dedicated statistical framework was elaborated for estimating LERmax, cardinal temperature and related uncertainties. Developed statistical framework enhanced the precision of cardinal temperatures estimated compared to previously reported methods, especially for base temperature. Maximum temperature was trickier to estimate and will require further studies. A significant genotypic variability for base and optimal temperature was pointed out, suggesting tropical japonica subspecies represents a relevant genetic pool to breed for rice genotypes adapted to various thermal situations. These results also suggested that using genotype-dependent cardinal temperature values should enhance the way crop growth models account for genotype x environment interactions hence their predictive value in current and future climatic conditions.
- Published
- 2018
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