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

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.

Bibliographic Details

Main Authors:	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.
Format:	article biblioteca
Language:	eng
Subjects:	F30 - Génétique et amélioration des plantes, F50 - Anatomie et morphologie des plantes, H50 - Troubles divers des plantes, F60 - Physiologie et biochimie végétale, 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, http://aims.fao.org/aos/agrovoc/c_5438, http://aims.fao.org/aos/agrovoc/c_24993, http://aims.fao.org/aos/agrovoc/c_3222, http://aims.fao.org/aos/agrovoc/c_5954, http://aims.fao.org/aos/agrovoc/c_13434, http://aims.fao.org/aos/agrovoc/c_16034, http://aims.fao.org/aos/agrovoc/c_117, http://aims.fao.org/aos/agrovoc/c_5776, http://aims.fao.org/aos/agrovoc/c_2392, http://aims.fao.org/aos/agrovoc/c_35130, http://aims.fao.org/aos/agrovoc/c_15975, http://aims.fao.org/aos/agrovoc/c_7979, http://aims.fao.org/aos/agrovoc/c_25189,
Online Access:	http://agritrop.cirad.fr/585624/ http://agritrop.cirad.fr/585624/1/2302.full.pdf
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