Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa
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)
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Subjects: | F60 - Physiologie et biochimie végétale, H50 - Troubles divers des plantes, F30 - Génétique et amélioration des plantes, Oryza glaberrima, Oryza sativa, résistance à la sécheresse, physiologie végétale, hybride, http://aims.fao.org/aos/agrovoc/c_5436, http://aims.fao.org/aos/agrovoc/c_5438, http://aims.fao.org/aos/agrovoc/c_2392, http://aims.fao.org/aos/agrovoc/c_25189, http://aims.fao.org/aos/agrovoc/c_3707, http://aims.fao.org/aos/agrovoc/c_4027, |
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dig-cirad-fr-4847752024-01-28T09:50:17Z http://agritrop.cirad.fr/484775/ http://agritrop.cirad.fr/484775/ Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa. Audebert Alain, Jones Monty P., Dingkuhn Michaël. 2000. 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. Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa Audebert, Alain Jones, Monty P. Dingkuhn, Michaël eng 2000 s.n. Third International Crop science Congress, Hamburg, Germany, 17-22 August 2000 F60 - Physiologie et biochimie végétale H50 - Troubles divers des plantes F30 - Génétique et amélioration des plantes Oryza glaberrima Oryza sativa résistance à la sécheresse physiologie végétale hybride http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_3707 Côte d'Ivoire http://aims.fao.org/aos/agrovoc/c_4027 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) conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/closedAccess http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=169351 |
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F60 - Physiologie et biochimie végétale H50 - Troubles divers des plantes F30 - Génétique et amélioration des plantes Oryza glaberrima Oryza sativa résistance à la sécheresse physiologie végétale hybride http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_3707 http://aims.fao.org/aos/agrovoc/c_4027 F60 - Physiologie et biochimie végétale H50 - Troubles divers des plantes F30 - Génétique et amélioration des plantes Oryza glaberrima Oryza sativa résistance à la sécheresse physiologie végétale hybride http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_3707 http://aims.fao.org/aos/agrovoc/c_4027 |
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F60 - Physiologie et biochimie végétale H50 - Troubles divers des plantes F30 - Génétique et amélioration des plantes Oryza glaberrima Oryza sativa résistance à la sécheresse physiologie végétale hybride http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_3707 http://aims.fao.org/aos/agrovoc/c_4027 F60 - Physiologie et biochimie végétale H50 - Troubles divers des plantes F30 - Génétique et amélioration des plantes Oryza glaberrima Oryza sativa résistance à la sécheresse physiologie végétale hybride http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_3707 http://aims.fao.org/aos/agrovoc/c_4027 Audebert, Alain Jones, Monty P. Dingkuhn, Michaël Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa |
description |
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) |
format |
conference_item |
topic_facet |
F60 - Physiologie et biochimie végétale H50 - Troubles divers des plantes F30 - Génétique et amélioration des plantes Oryza glaberrima Oryza sativa résistance à la sécheresse physiologie végétale hybride http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_3707 http://aims.fao.org/aos/agrovoc/c_4027 |
author |
Audebert, Alain Jones, Monty P. Dingkuhn, Michaël |
author_facet |
Audebert, Alain Jones, Monty P. Dingkuhn, Michaël |
author_sort |
Audebert, Alain |
title |
Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa |
title_short |
Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa |
title_full |
Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa |
title_fullStr |
Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa |
title_full_unstemmed |
Morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in Oryza glaberrima and Oryza sativa |
title_sort |
morpho-physiological characteristics in rice reflect different drought adaptation mechanisms in oryza glaberrima and oryza sativa |
publisher |
s.n. |
url |
http://agritrop.cirad.fr/484775/ |
work_keys_str_mv |
AT audebertalain morphophysiologicalcharacteristicsinricereflectdifferentdroughtadaptationmechanismsinoryzaglaberrimaandoryzasativa AT jonesmontyp morphophysiologicalcharacteristicsinricereflectdifferentdroughtadaptationmechanismsinoryzaglaberrimaandoryzasativa AT dingkuhnmichael morphophysiologicalcharacteristicsinricereflectdifferentdroughtadaptationmechanismsinoryzaglaberrimaandoryzasativa |
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1792495099753529344 |