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Leaf morphology, rather than plant water status, underlies genetic variation of rice leaf rolling under drought

Cal Andrew J., Sanciangco Millicent, Rebolledo Maria Camila, Luquet Delphine, Torres Rolando O., McNally Kenneth L., Henry Amelia. 2019. Leaf morphology, rather than plant water status, underlies genetic variation of rice leaf rolling under drought. Plant, Cell and Environment, 42 (5) : pp. 1532-1544.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Outlier, Sujet : PLANT SCIENCES

Abstract : Soil drying causes leaf rolling in rice, but the relationship between leaf rolling and drought tolerance has historically confounded selection of drought tolerant genotypes. In this study on tropical japonica and aus diversity panels (170‐220 genotypes), the degree of leaf rolling under drought was more affected by leaf morphology than by stomatal conductance, leaf water status, or maintenance of shoot biomass and grain yield. A range of canopy temperature and leaf rolling (measured as change in normalized difference vegetation index (ΔNDVI)) combinations were observed among aus genotypes, indicating that some genotypes continued transpiration while rolled. Association mapping indicated co‐location of genomic regions for leaf rolling score and ΔNDVI under drought with previously reported leaf rolling genes and gene networks related to leaf anatomy. The relatively subtle variation across these large diversity panels may explain the lack of agreement of this study with earlier reports that used small numbers of genotypes that were highly divergent in hydraulic traits driving leaf rolling differences. This study highlights the large range of physiological responses to drought among rice genotypes, and emphasizes that drought response processes should be understood in detail before incorporating them into a varietal selection program.

Mots-clés Agrovoc : riz, Oryza sativa, Résistance à la sécheresse, Variation génétique, Phénotype, Enroulement des feuilles

Mots-clés libres : Rice, Drought, Leaf rolling, Phenotyping, Genetic diversity

Classification Agris : F50 - Plant structure
F30 - Plant genetics and breeding
F60 - Plant physiology and biochemistry

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

  • Cal Andrew J., IRRI (PHL)
  • Sanciangco Millicent, IRRI (PHL)
  • Rebolledo Maria Camila, CIRAD-BIOS-UMR AGAP (FRA)
  • Luquet Delphine, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-2543-7140
  • Torres Rolando O., IRRI (PHL)
  • McNally Kenneth L., IRRI (PHL)
  • Henry Amelia, IRRI (PHL) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591071/)

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