Genetic control of plasticity in root morphology and anatomy of rice in response to water deficit

Kadam Niteen N., Tamilselvan Anandhan, Lawas Lovely M.F., Quiñones Cherryl O., Bahuguna Rajeev N., Thomson Michael J., Dingkuhn Michaël, Muthurajan Raveendran, Struik Paul C., Yin Xinyou, Jagadish Krishna S.V.. 2017. Genetic control of plasticity in root morphology and anatomy of rice in response to water deficit. Plant Physiology, 174 (4) : 2302-2315.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : Elucidating the genetic control of rooting behavior under water-deficit stress is essential to breed climate-robust rice (Oryza sativa) cultivars. Using a diverse panel of 274 indica genotypes grown under control and water-deficit conditions during vegetative growth, we phenotyped 35 traits, mostly related to root morphology and anatomy, involving 45,000 root-scanning images and nearly 25,000 cross sections from the root-shoot junction. The phenotypic plasticity of these traits was quantified as the relative change in trait value under water-deficit compared with control conditions. We then carried out a genome-wide association analysis on these traits and their plasticity, using 45,608 high-quality single-nucleotide polymorphisms. One hundred four significant loci were detected for these traits under control conditions, 106 were detected under water-deficit stress, and 76 were detected for trait plasticity. We predicted 296 (control), 284 (water-deficit stress), and 233 (plasticity) a priori candidate genes within linkage disequilibrium blocks for these loci. We identified key a priori candidate genes regulating root growth and development and relevant alleles that, upon validation, can help improve rice adaptation to water-deficit stress.

Mots-clés Agrovoc : Oryza sativa, stress dû à la sécheresse, génétique, anatomie végétale, morphologie végétale, système racinaire, adaptation, phénotype, résistance à la sécheresse, résistance génétique, variation génétique, zone tropicale, physiologie végétale

Classification Agris : F30 - Génétique et amélioration des plantes
F50 - Anatomie et morphologie des plantes
H50 - Troubles divers des plantes
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Kadam Niteen N., IRRI [International Rice Research Institute] (PHL)
• Tamilselvan Anandhan, IRRI [International Rice Research Institute] (PHL)
• Lawas Lovely M.F., IRRI [International Rice Research Institute] (PHL)
• Quiñones Cherryl O., IRRI [International Rice Research Institute] (PHL)
• Bahuguna Rajeev N., IRRI [International Rice Research Institute] (PHL)
• Thomson Michael J., IRRI [International Rice Research Institute] (PHL)
• Dingkuhn Michaël, CIRAD-BIOS-UMR AGAP (PHL)
• Muthurajan Raveendran, TNAU (IND)
• Struik Paul C., Wageningen Agricultural University (NLD)
• Yin Xinyou, Wageningen University and Research Centre (NLD)
• Jagadish Krishna S.V., IRRI [International Rice Research Institute] (PHL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585624/)

Métriques

[ Page générée et mise en cache le 2024-12-18 ]