Rice root architectural plasticity traits and genetic regions for adaptability to variable cultivation and stress conditions

Sandhu Nitika, Raman K. Anitha, Torres Rolando O., Audebert Alain, Dardou Audrey, Kumar Arvind, Henry Amelia. 2016. Rice root architectural plasticity traits and genetic regions for adaptability to variable cultivation and stress conditions. Plant Physiology, 171 : 2562-2576.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : 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.

Mots-clés Agrovoc : Oryza sativa, système racinaire, rhizosphère, adaptation, stress dû à la sécheresse, morphologie végétale, génotype, locus

Mots-clés géographiques Agrovoc : Inde

Mots-clés libres : Rice Roots, Plasticity, Architecture, Stress

Classification Agris : F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement
F30 - Génétique et amélioration des plantes

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

Auteurs et affiliations

• Sandhu Nitika, IRRI [International Rice Research Institute] (PHL)
• Raman K. Anitha, IRRI [International Rice Research Institute] (PHL)
• Torres Rolando O., IRRI [International Rice Research Institute] (PHL)
• Audebert Alain, CIRAD-BIOS-UMR AGAP (SEN) ORCID: 0000-0002-5822-7166
• Dardou Audrey, CIRAD-BIOS-UMR AGAP (FRA)
• Kumar Arvind, IRRI [International Rice Research Institute] (PHL)
• Henry Amelia, IRRI [International Rice Research Institute] (PHL) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589144/)

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