Agritrop
Accueil

Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa

Audebert Alain, Jones Monty P., Dingkuhn Michaël. 2000. Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa. In : Third International Crop science Congress, Hamburg, Germany, 17-22 August 2000. ESA. s.l. : s.n., 1 p. International Crop Science Congress. 3, Hambourg, Allemagne, 17 Août 2000/22 Août 2000.

Communication par affiche
Texte intégral non disponible.

Autre titre : Les caractéristiques morpho-physiologiques chez le riz sont le reflets de mécanismes d'adaptation à la sècheresse différents chez Oryza glaberrima et Oryza sativa

Résumé : Crosses of Asian rice, #Oryza sativa#, with African rice, #Oryza glaberrima#, aim at reducing the trade-offs between yield potential, weed competitiveness and drought resistance. Research at WARDA shows that the morpho-physiological characteristics of these two rice groups are quite different. The African rice, #O. glaberrima#, is weed competitive, characterized by high vegetative growth rate (shoot and root), resulting from low phyllochron, a large specific leaf area, a high light extinction coefficient and increased partitioning of assimilates to leaf blades. This high specific leaf area is associated with a low stomatal density and a low chlorophyll content; the rapid vegetative growth rate with the high light extinction coefficient maximizes the evapotranspirative surface. In addition, carbon-isotope discrimination (CID) studies show high values for #O. glaberrima# like the lowland #O. sativa# subsp. #indica# in contrast to upland rice (#O. sativa# subsp. #japonica#). Therefore, #O. glaberrima# uses a large quantity of water. Although high vegetative growth (shoot and root), large specific leaf area, and poor water use efficiency (CID) are not good characteristics for drought adaptation, #Oryza glaberrima# does show very good adaptation to the drought environnement (low stomatal density, fast leaf rolling, good maintenance of plant water status by the control of stomatal conductance). These differences imply that there are different physiological mechanisms for drought avoidance in #O. sativa# and #O. glaberrima#. It is important for the development of drought-adapted interspecifics that we know the physiological drought mechanisms used by #O. glaberrima#. (Texte intégral)

Mots-clés Agrovoc : Oryza glaberrima, Oryza sativa, résistance à la sécheresse, physiologie végétale, hybride

Mots-clés géographiques Agrovoc : Côte d'Ivoire

Classification Agris : F60 - Physiologie et biochimie végétale
H50 - Troubles divers des plantes
F30 - Génétique et amélioration des plantes

Auteurs et affiliations

  • Audebert Alain, CIRAD-CA-CALIM (CIV) ORCID: 0000-0002-5822-7166
  • Jones Monty P., ADRAO (CIV)
  • Dingkuhn Michaël, CIRAD-AMIS-AGRONOMIE (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/484775/)

Voir la notice (accès réservé à Agritrop) Voir la notice (accès réservé à Agritrop)

[ Page générée et mise en cache le 2024-03-21 ]