Phenotypic plasticity of rice seedlings : case of p deficiency

Luquet Delphine, Zhang Bao Gui, Dingkuhn Michaël, Dexet Amandine. 2004. Phenotypic plasticity of rice seedlings : case of p deficiency. In : New directions for a diverse planet : Proceedings for the 4th International Crop Science Congress, Brisbane, Australia, 26 Sep - 1 Oct 2004. Turner Neil (ed.), Angus John (ed.), Mc Intyre Lynne (ed.), Robertson Michael (ed.), Borrell Andrew (ed.), Lloyd David (ed.). Gosford : Regional Institute, pp. 1-15. ISBN 1-920842-20-9 International Crop Science Congress. 4, Brisbane, Australie, 26 September 2004/1 October 2004.

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Abstract : Plant morphogenesis is subject to environmental influence. The underlying control mechanisms are of great interest for crop improvement. A phytotron study on Nippon Bare rice seedlings was conducted to analyze the effects of P deficiency on plant organogenesis (tiller and leaf appearance, root apex number) and allometric relationships (root/shoot weight ratio, specific leaf area (SLA) and specific root length (SRL), leaf blade/sheath length ratio). The results confirmed that the main effect of P deficiency is a reduction of shoot growth to the benefit of the root system. This phenomenon, apparently caused by a reduction in leaf elongation rate without changing final leaf size, explains other changes in morphogenesis, such as longer phyllochron (because leaves take longer to expand) and lower tillering rate (because tillering is largely under trophic control). Allometric parameters such as SLA, SLR, root apex number per unit length and leaf blade/sheath length ratios remained stable. Further studies on the genetic control of phenotypic plasticity are suggested. (Résumé d'auteur)

Mots-clés Agrovoc : Oryza sativa, Phénotype, Morphogénèse, Carence minérale, Phosphore, Système racinaire, Développement biologique, Organogénèse, Tallage, Feuille, Pousse, Chambre de croissance

Mots-clés complémentaires : Sink effect

Classification Agris : F62 - Plant physiology - Growth and development
F04 - Fertilizing

Auteurs et affiliations

  • Luquet Delphine, CIRAD-AMIS-AGRONOMIE (FRA) ORCID: 0000-0002-2543-7140
  • Zhang Bao Gui, CAU [China Agricultural University] (CHN)
  • Dingkuhn Michaël, CIRAD-AMIS-AGRONOMIE (FRA)
  • Dexet Amandine

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