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The qTSN positive effect on panicle and flag leaf Size of rice is associated with an early down-regulation of tillering

Adriani Dewi Erika, Lafarge Tanguy, Dardou Audrey, Fabro Aubrey, Clément-Vidal Anne, Yahya Sudirman, Dingkuhn Michaël, Luquet Delphine. 2016. The qTSN positive effect on panicle and flag leaf Size of rice is associated with an early down-regulation of tillering. Frontiers in Plant Science, 6 (1197), 17 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : The qTSN4 was identified as rice QTL (Quantitative Traits Locus) increasing total spikelet number per panicle and flag leaf area but potentially reducing panicle number depending on the environment. So far, this trade-off was mainly observed at grain maturity and not specifically studied in details, limiting the apprehension of the agronomic interest of qTSN4. This study aimed to understand the effect of qTSN4 and of the environment on panicle sizing, its trade-off with panicle number, and finally plant grain production. It compared two high yielding genotypes to their Near Isogenic Lines (NIL) carrying either QTL qTSN4 or qTSN12, two distinct QTLs contributing to the enlarged panicle size, thereafter designated as qTSN. Traits describing C sink (organ appearance rate, size, biomass) and source (leaf area, photosynthesis, sugar availability) were dynamically characterized along plant and/or panicle development within two trials (greenhouse, field), each comparing two treatments contrasting for plant access to light (with or without shading, high or low planting densities). The positive effect of qTSN on panicle size and flag leaf area of the main tiller was confirmed. More precisely, it could be shown that qTSN increased leaf area and internode cross-section, and in some cases of the photosynthetic rate and starch reserves, of the top 3–4 phytomers of the main tiller. This was accompanied by an earlier tillering cessation, that coincided with the initiation of these phytomers, and an enhanced panicle size on the main tiller. Plant leaf area at flowering was not affected by qTSN but fertile tiller number was reduced to an extent that depended on the environment. Accordingly, plant grain production was enhanced by qTSN only under shading in the greenhouse experiment, where panicle number was not affected and photosynthesis and starch storage in internodes was enhanced. The effect of qTSN on rice phenotype was thus expressed before panicle initiation (PI). Whether early tillering reduction or organ oversizing at meristem level is affected first cannot be entirely unraveled. Further studies are needed to better understand any signal involved in this early regulation and the qTSN × Environment interactions underlying its agronomic interest. (Résumé d'auteur)

Mots-clés Agrovoc : Oryza sativa, Locus des caractères quantitatifs, Panicule, Anatomie végétale, Tallage, Dimension, Développement biologique, Morphogénèse, Taux de croissance, Tige, Physiologie végétale, Évaluation de l'impact, Expérimentation, Génie génétique

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : QTL

Classification Agris : F30 - Plant genetics and breeding
F62 - Plant physiology - Growth and development
F50 - Plant structure

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

Auteurs et affiliations

  • Adriani Dewi Erika, CIRAD-BIOS-UMR AGAP (FRA)
  • Lafarge Tanguy, CIRAD-BIOS-UMR AGAP (FRA)
  • Dardou Audrey, CIRAD-BIOS-UMR AGAP (FRA)
  • Fabro Aubrey, IRRI (PHL)
  • Clément-Vidal Anne, CIRAD-BIOS-UMR AGAP (FRA)
  • Yahya Sudirman, Bogor Agricultural University (IDN)
  • Dingkuhn Michaël, CIRAD-BIOS-UMR AGAP (PHL)
  • Luquet Delphine, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-2543-7140

Source : Cirad-Agritrop (https://agritrop.cirad.fr/579773/)

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