Abstract
Key message
We discovered four QTLs that maintain proper rice amylose content at high temperature by increasing the splicing efficiency of Wx gene.
Abstract
Amylose content mainly controlled by Wx gene is a key physicochemical property for eating and cooking quality in rice. During the grain filling stage, high temperature can harm rice grain quality by significantly reducing the amylose content in many rice varieties. Here, we provide genetic evidences between Wx gene expression and rice amylose content at high temperature, and identified several quantitative trait loci (QTLs) in this pathway. We performed a genome-wide survey on a set of chromosome segment substitution lines (CSSLs) which carried chromosomal segments from the heat resistant indica 9311 in the heat-sensitive japonica Nipponbare background. Four QTLs, qHAC4, qHAC8a, qHAC8b and qHAC10, which can reduce the deleterious effects of amylose content at high temperature, were identified and mapped to chromosome 4, 8, 8 and 10, respectively. The major QTL qHAC8a, with the highest LOD score of 6.196, was physically mapped to a small chromosome segment (~300 kb). The CSSLs carrying the qHAC8a, qHAC8b and/or qHAC4 from 9311 have the high pre-mRNA splicing efficiency of Wx gene and likely lead to stable amylose content at high temperature. Thus, increasing pre-mRNA processing efficiency of Wx gene could be an important regulation mechanism for maintaining stable amylose content in rice seeds at high temperature. In addition, our results provide a theoretical basis for breeding heat-stable grain in rice.
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Abbreviations
- CSSL:
-
Chromosome segment substitution line
- DAF:
-
Days after flowering
- DBE:
-
Starch debranching enzyme
- D-value:
-
Difference value
- DD-value:
-
Difference in the D-values
- GBSS:
-
Granule-bound starch synthase
- HT:
-
High temperature
- HTC:
-
High temperature condition
- QTL:
-
Quantitative trait locus
- qHAC:
-
QTLs for amylose content responsive to high temperatures
- SBE:
-
Starch branching enzyme
- SSS:
-
Soluble starch synthase
- RT:
-
Room temperature
- RTC:
-
Room temperature condition
- LT:
-
Low temperature
- LTC:
-
Low temperature condition
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Acknowledgments
We thank Dr. Jian Hua for commenting on the manuscript (Department of Plant Biology, Cornell University, Ithaca, New York). We thank Professor Xiuling Cai and Dr. Derui Liu (Institute of Plant physiology and ecology, CAS) for supervising the enzyme activity assay. This work was supported by Ministry of Science and Technology (2012AA10A302 and 2012CB944803), China Postdoctoral Science Foundation (2013M541799), Zhejiang Provincial Postdoctoral Science Foundation (Bsh1202081), Jiangsu Natural Science Foundation (BK2012010) and Scientific Program of Zhejiang Academy of Agricultural Sciences of China.
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Communicated by T. Sasaki.
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Zhang, H., Duan, L., Dai, JS. et al. Major QTLs reduce the deleterious effects of high temperature on rice amylose content by increasing splicing efficiency of Wx pre-mRNA. Theor Appl Genet 127, 273–282 (2014). https://doi.org/10.1007/s00122-013-2216-4
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DOI: https://doi.org/10.1007/s00122-013-2216-4