Li Zhi-Kang, Yu Si-Bin, Huang Ning, Hittalmani Shailaja, Courtois Brigitte, McLaren Graham, Zhuang J.Y., Liu J.F., Singh V.P..
2002. QTL by environment interactions in rice: Significance and causes.
In : Plant, Animal and Microbe Genomes 10th Conference. Abstracts
Résumé : To understand the genetic basis of genotype by environment (GE) interaction associated with quantitative trait variation, QTL by environment (QE) interactions affecting several quantitative traits were investigated in three rice mapping populations. Several general results were obtained regarding the QE interactions in rice. First, all QTLs showed varied degrees of QE interaction and GE interactions are reflected in two aspects: inconsistent QTL detection across environments and the presence of significant QE effects. In the former case, some undetectable QTLs appeared to result from non- or weak expression of these QTLs in certain environments, which had gone undetected under the commonly used thresholds. Second, QTLs differ greatly in their GE interactions and epistasis plays an important role in QE interactions. Third, different QTLs affecting the same phenotype may differ greatly in their interactions with the environments. Some QTLs were detectable across all nine environments and showed consistent effects (in direction) while others were detected in few environments and had larger variation in their effects in both magnitude and direction. Forth, differential gene expression to biotic and abiotic stresses or other environmental factors (such as daylength, temperature, cultural practices, soil fertility, drought, etc.) was shown to be responsible for some of the observed QE interactions. For instance, under normal and submergence stresses, different sets of M-QTLs affecting stem (elongation) were detected and the expression of most M-QTLs was much stronger under the more stressful condition. It is also interesting to note that the major gene Sub1 for submergence tolerance was detected as a small QTL when the plants were submerged under the clear water condition (test 1). Finally, importance of the QE interaction and its implications in marker-aided manipulation of QTLs for genetic improvement of quantitative traits in plant breeding programs are discussed. (Texte intégral)
Mots-clés Agrovoc : Oryza, intéraction génotype environnement, technique analytique
Mots-clés complémentaires : QTL
Classification Agris : F30 - Génétique et amélioration des plantes
Auteurs et affiliations
- Li Zhi-Kang, IRRI [International Rice Research Institute] (PHL)
- Yu Si-Bin, IRRI [International Rice Research Institute] (PHL)
- Huang Ning, IRRI [International Rice Research Institute] (PHL)
- Hittalmani Shailaja, UAS (IND)
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Courtois Brigitte, CIRAD-AMIS-BIOTROP (FRA)
ORCID: 0000-0003-2118-7102
- McLaren Graham, IRRI [International Rice Research Institute] (PHL)
- Zhuang J.Y., CNRRI (CHN)
- Liu J.F., SCAU (CHN)
- Singh V.P., IARI (IND)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/487387/)
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