title: Rice Root Architectural Plasticity Traits and Genetic Regions for Adaptability to Variable Cultivation and Stress Conditions.
abstract: Future rice (Oryza sativa) crops will likely experience a range of growth conditions, and root architectural plasticity will be an important characteristic to confer adaptability across variable environments. In this study, the relationship between root architectural plasticity and adaptability (i.e. yield stability) was evaluated in two traditional × improved rice populations (Aus 276 × MTU1010 and Kali Aus × MTU1010). Forty contrasting genotypes were grown in direct-seeded upland and transplanted lowland conditions with drought and drought + rewatered stress treatments in lysimeter and field studies and a low-phosphorus stress treatment in a Rhizoscope study. Relationships among root architectural plasticity for root dry weight, root length density, and percentage lateral roots with yield stability were identified. Selected genotypes that showed high yield stability also showed a high degree of root plasticity in response to both drought and low phosphorus. The two populations varied in the soil depth effect on root architectural plasticity traits, none of which resulted in reduced grain yield. Root architectural plasticity traits were related to 13 (Aus 276 population) and 21 (Kali Aus population) genetic loci, which were contributed by both the traditional donor parents and MTU1010. Three genomic loci were identified as hot spots with multiple root architectural plasticity traits in both populations, and one locus for both root architectural plasticity and grain yield was detected. These results suggest an important role of root architectural plasticity across future rice crop conditions and provide a starting point for marker-assisted selection for plasticity.
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.).
authors.forename: Nitika
authors.initials: N
authors.lastname: Sandhu
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.).
authors.forename: K Anitha
authors.initials: KA
authors.lastname: Raman
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.).
authors.forename: Rolando O
authors.initials: RO
authors.lastname: Torres
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.).
authors.forename: Alain
authors.initials: A
authors.lastname: Audebert
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.).
authors.forename: Audrey
authors.initials: A
authors.lastname: Dardou
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.).
authors.forename: Arvind
authors.initials: A
authors.lastname: Kumar
authors.affiliation: International Rice Research Institute, Los Baños, Laguna 4031, Philippines (N.S., K.A.R., R.O.T., A.K., A.H.); andCIRAD, Unité Mixte de Recherche AGAP, 34398 Montpellier Cedex 5, France (A.A., A.D.) a.henry@irri.org.
authors.forename: Amelia
authors.initials: A
authors.lastname: Henry
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects / Q000235:genetics; D000383:Agriculture; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D055864:Droughts; D056426:Genetic Loci; D018745:Genome, Plant; D005838:Genotype; D016014:Linear Models; D015999:Multivariate Analysis; D012275:Oryza / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D010641:Phenotype; D010758:Phosphorus / Q000494:pharmacology; D018517:Plant Roots / Q000033:anatomy & histology* / Q000235:genetics*; D019655:Quantitative Trait, Heritable; D036226:Seedlings / Q000187:drug effects / Q000502:physiology; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water; D010758:Phosphorus