Abstract
Drought is a major constraint to rice (Oryza sativa L.) production in rainfed and poorly irrigated environments. Identifying genomic regions influencing the response of yield and its components to water deficits will aid our understanding of the genetic mechanism of drought tolerance (DT) of rice and the development of DT varieties. Grain yield (GY) and its components of a recombinant inbred population developed from a lowland rice and an upland rice were investigated under different water levels in 2003 and 2004 in a rainout DT screening facility. Correlation and path analysis indicated that spikelet fertility (SF) was particularly important for grain yield with direct effect (P=0.60) under drought stress, while spikelet number per panicle (SN) contributed the most to grain yield (P=0.41) under well-watered condition. A total of 32 quantitative trait loci (QTLs) for grain yield and its components were identified. The phenotypic variation explained by individual QTLs varied from 1.29% to 14.76%. Several main effect QTLs affecting SF, 1,000-grain weight (TGW), panicle number (PN), and SN were mapped to the same regions on chromosome 4 and 8. These QTLs were detected consistently across 2 years and under both water levels in this study. Several digenic interactions among yield components were also detected. The identification of genomic regions associated with GY and its components under stress will be useful to improve drought tolerance of rice by marker-aided approaches.
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Abbreviations
- A :
-
Additive effect
- AA :
-
Additive × additive epistasis
- AE :
-
Additive × environment interaction
- AAE :
-
Epistasis × environment interaction
- DT:
-
Drought tolerance
- E-QTL:
-
Epistatic QTL
- GY:
-
Grain yield
- M-QTL:
-
Main effect QTL
- PN:
-
Panicle number
- QTL:
-
Quantitative trait locus
- Q×E:
-
QTL × environment interaction
- RIL:
-
Recombinant inbred line
- SF:
-
Spikelet fertility
- SN:
-
Spikelet number per panicle
- SSR:
-
Simple sequence repeats
- TGW:
-
1,000-grain weight
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Acknowledgements
We are grateful to Dr A. Blum and Dr J. C. O’Toole for their advice on the construction of the screening facility and on drought tolerant screening trials. This study was jointly supported by grants from Chinese Ministry of Science and Technology (973 plan, 2004B17200; 863 plan, 2003AA207010), Chinese Ministry of Agriculture (948 plan, 2001-101), Shanghai Municipal Science and Technology Commission (02ZC14082, 03DJ14014, 05DJ14008) and the Rockefeller Foundation (2004FS071), New York, USA.
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Communicated by D. J. Mackill
G. H. Zou and H. W. Mei contribute equally to this work.
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Zou, G.H., Mei, H.W., Liu, H.Y. et al. Grain yield responses to moisture regimes in a rice population: association among traits and genetic markers. Theor Appl Genet 112, 106–113 (2005). https://doi.org/10.1007/s00122-005-0111-3
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DOI: https://doi.org/10.1007/s00122-005-0111-3