Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields
Water deficit at the flowering stage causes dramatic reductions in rice yield. Screening for tolerance to water stress at this stage is complicated by differences in flowering dates among lines and technical problems of imposing uniform, repeatable experimental conditions. The objectives of this work were to document genetic variation in tolerance to water deficit during flowering and grain filling among doubled haploid rice lines (DHL) from a japonica-by-indica cross, to identify genetic markers associated with performance, and to identify secondary traits that cosegregate with yield or yield components. In one season, staggered planting dates were used to synchronize flowering. In a second season, rice was grown using furrow irrigation and two periods of moderate water deficit were imposed in order to stress all entries at the most sensitive stage. In both seasons, stress treatments affected the percentage of sterile spikelets and the weight per grain. Quantitative trait loci (QTLs) were identified for yield components in each season and water level. A few QTLs had consistent effects across environments and/or seasons, but others were specific to the measurement environment. Across years, the QTLs identified for yield components under stress were not identified in the control, indicating that spill-over effects are not adequate to exploit the genetic potential for yield under stress that is present in this population. On the other hand, the interval containing the sd1 gene appears to have a major effect on sterility, yield and harvest index under varied conditions. Some QTLs for yield components under stress cosegregated with reported QTLs for drought-adaptive traits such as root depth and thickness.
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Subjects: | F30 - Génétique et amélioration des plantes, Oryza sativa, résistance à la sécheresse, floraison, remplissage du grain, variation génétique, marqueur génétique, rendement des cultures, http://aims.fao.org/aos/agrovoc/c_5438, http://aims.fao.org/aos/agrovoc/c_2392, http://aims.fao.org/aos/agrovoc/c_2992, http://aims.fao.org/aos/agrovoc/c_26785, http://aims.fao.org/aos/agrovoc/c_15975, http://aims.fao.org/aos/agrovoc/c_24030, http://aims.fao.org/aos/agrovoc/c_10176, http://aims.fao.org/aos/agrovoc/c_5783, |
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dig-cirad-fr-4789472024-01-28T09:02:50Z http://agritrop.cirad.fr/478947/ http://agritrop.cirad.fr/478947/ Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields. Lafitte Renée Honor, Courtois Brigitte. 2000. In : Molecular approaches for the genetic improvement of cereals for stable production in water-limited environments : A strategic planning workshop held at CIMMYT, El Batan, Mexico, 21-25 June 1999, with support from the Rockeffeller Foundation. Ribaut Jean-Marcel (ed.), Poland David (ed.). CIMMYT. Mexico : CIMMYT, 97-102. ISBN 970-648-052-8 Workshop on Molecular Approaches for the Genetic Improvement of Cereals for Stable Production in Water-limited Environments, El Batan, Mexique, 21 Juin 1999/25 Juin 1999. Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields Lafitte, Renée Honor Courtois, Brigitte eng 2000 CIMMYT Molecular approaches for the genetic improvement of cereals for stable production in water-limited environments : A strategic planning workshop held at CIMMYT, El Batan, Mexico, 21-25 June 1999, with support from the Rockeffeller Foundation F30 - Génétique et amélioration des plantes Oryza sativa résistance à la sécheresse floraison remplissage du grain variation génétique marqueur génétique rendement des cultures http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_2992 http://aims.fao.org/aos/agrovoc/c_26785 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_24030 http://aims.fao.org/aos/agrovoc/c_10176 Philippines http://aims.fao.org/aos/agrovoc/c_5783 Water deficit at the flowering stage causes dramatic reductions in rice yield. Screening for tolerance to water stress at this stage is complicated by differences in flowering dates among lines and technical problems of imposing uniform, repeatable experimental conditions. The objectives of this work were to document genetic variation in tolerance to water deficit during flowering and grain filling among doubled haploid rice lines (DHL) from a japonica-by-indica cross, to identify genetic markers associated with performance, and to identify secondary traits that cosegregate with yield or yield components. In one season, staggered planting dates were used to synchronize flowering. In a second season, rice was grown using furrow irrigation and two periods of moderate water deficit were imposed in order to stress all entries at the most sensitive stage. In both seasons, stress treatments affected the percentage of sterile spikelets and the weight per grain. Quantitative trait loci (QTLs) were identified for yield components in each season and water level. A few QTLs had consistent effects across environments and/or seasons, but others were specific to the measurement environment. Across years, the QTLs identified for yield components under stress were not identified in the control, indicating that spill-over effects are not adequate to exploit the genetic potential for yield under stress that is present in this population. On the other hand, the interval containing the sd1 gene appears to have a major effect on sterility, yield and harvest index under varied conditions. Some QTLs for yield components under stress cosegregated with reported QTLs for drought-adaptive traits such as root depth and thickness. 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=164070 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=176643 |
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F30 - Génétique et amélioration des plantes Oryza sativa résistance à la sécheresse floraison remplissage du grain variation génétique marqueur génétique rendement des cultures http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_2992 http://aims.fao.org/aos/agrovoc/c_26785 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_24030 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_5783 F30 - Génétique et amélioration des plantes Oryza sativa résistance à la sécheresse floraison remplissage du grain variation génétique marqueur génétique rendement des cultures http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_2992 http://aims.fao.org/aos/agrovoc/c_26785 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_24030 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_5783 |
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F30 - Génétique et amélioration des plantes Oryza sativa résistance à la sécheresse floraison remplissage du grain variation génétique marqueur génétique rendement des cultures http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_2992 http://aims.fao.org/aos/agrovoc/c_26785 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_24030 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_5783 F30 - Génétique et amélioration des plantes Oryza sativa résistance à la sécheresse floraison remplissage du grain variation génétique marqueur génétique rendement des cultures http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_2992 http://aims.fao.org/aos/agrovoc/c_26785 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_24030 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_5783 Lafitte, Renée Honor Courtois, Brigitte Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
description |
Water deficit at the flowering stage causes dramatic reductions in rice yield. Screening for tolerance to water stress at this stage is complicated by differences in flowering dates among lines and technical problems of imposing uniform, repeatable experimental conditions. The objectives of this work were to document genetic variation in tolerance to water deficit during flowering and grain filling among doubled haploid rice lines (DHL) from a japonica-by-indica cross, to identify genetic markers associated with performance, and to identify secondary traits that cosegregate with yield or yield components. In one season, staggered planting dates were used to synchronize flowering. In a second season, rice was grown using furrow irrigation and two periods of moderate water deficit were imposed in order to stress all entries at the most sensitive stage. In both seasons, stress treatments affected the percentage of sterile spikelets and the weight per grain. Quantitative trait loci (QTLs) were identified for yield components in each season and water level. A few QTLs had consistent effects across environments and/or seasons, but others were specific to the measurement environment. Across years, the QTLs identified for yield components under stress were not identified in the control, indicating that spill-over effects are not adequate to exploit the genetic potential for yield under stress that is present in this population. On the other hand, the interval containing the sd1 gene appears to have a major effect on sterility, yield and harvest index under varied conditions. Some QTLs for yield components under stress cosegregated with reported QTLs for drought-adaptive traits such as root depth and thickness. |
format |
conference_item |
topic_facet |
F30 - Génétique et amélioration des plantes Oryza sativa résistance à la sécheresse floraison remplissage du grain variation génétique marqueur génétique rendement des cultures http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_2392 http://aims.fao.org/aos/agrovoc/c_2992 http://aims.fao.org/aos/agrovoc/c_26785 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_24030 http://aims.fao.org/aos/agrovoc/c_10176 http://aims.fao.org/aos/agrovoc/c_5783 |
author |
Lafitte, Renée Honor Courtois, Brigitte |
author_facet |
Lafitte, Renée Honor Courtois, Brigitte |
author_sort |
Lafitte, Renée Honor |
title |
Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
title_short |
Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
title_full |
Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
title_fullStr |
Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
title_full_unstemmed |
Genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
title_sort |
genetic variation in performance under reproductive-stage water deficit in a doubled haploid rice population in upland fields |
publisher |
CIMMYT |
url |
http://agritrop.cirad.fr/478947/ |
work_keys_str_mv |
AT lafittereneehonor geneticvariationinperformanceunderreproductivestagewaterdeficitinadoubledhaploidricepopulationinuplandfields AT courtoisbrigitte geneticvariationinperformanceunderreproductivestagewaterdeficitinadoubledhaploidricepopulationinuplandfields |
_version_ |
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