Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice.
Grain chalkiness is an important grain quality related to starch granules in the endosperm. A high percentage of grain chalkiness is a major problem because it diminishes grain quality in rice. Here, we report quantitative trait loci identification for grain chalkiness using high-throughput single n...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2015-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0122013 |
| _version_ | 1818362092601737216 |
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| author | Wenqian Sun Qiaoling Zhou Yue Yao Xianjin Qiu Kun Xie Sibin Yu |
| author_facet | Wenqian Sun Qiaoling Zhou Yue Yao Xianjin Qiu Kun Xie Sibin Yu |
| author_sort | Wenqian Sun |
| collection | DOAJ |
| description | Grain chalkiness is an important grain quality related to starch granules in the endosperm. A high percentage of grain chalkiness is a major problem because it diminishes grain quality in rice. Here, we report quantitative trait loci identification for grain chalkiness using high-throughput single nucleotide polymorphism genotyping of a chromosomal segment substitution line population in which each line carried one or a few introduced japonica cultivar Nipponbare segments in the genetic background of the indica cultivar ZS97. Ten quantitative trait loci regions were commonly identified for the percentage of grain chalkiness and the degree of endosperm chalkiness. The allelic effects at nine of these quantitative trait loci reduced grain chalkiness. Furthermore, a quantitative trait locus (qPGC8-2) on chromosome 8 was validated in a chromosomal segment substitution line-derived segregation population, and had a stable effect on chalkiness in a multiple-environment evaluation of the near-isogenic lines. Residing on the qPGC8-2 region, the isoamylase gene (ISA1) was preferentially expressed in the endosperm and revealed some nucleotide polymorphisms between two varieties, Nipponbare and ZS97. Transgenic lines with suppression of ISA1 by RNA interference produced grains with 20% more chalkiness than the control. The results support that the gene may underlie qPGC8-2 for grain chalkiness. The multiple-environment trials of the near-isogenic lines also show that combination of the favorable alleles such as the ISA1 gene for low chalkiness and the GS3 gene for long grains considerably improved grain quality of ZS97, which proves useful for grain quality improvement in rice breeding programs. |
| first_indexed | 2024-12-13T21:27:05Z |
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| id | doaj.art-9ecc482553e340e09fce2c3e6b3d7c14 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-13T21:27:05Z |
| publishDate | 2015-01-01 |
| publisher | Public Library of Science (PLoS) |
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| series | PLoS ONE |
| spelling | doaj.art-9ecc482553e340e09fce2c3e6b3d7c142022-12-21T23:30:55ZengPublic Library of Science (PLoS)PLoS ONE1932-62032015-01-01103e012201310.1371/journal.pone.0122013Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice.Wenqian SunQiaoling ZhouYue YaoXianjin QiuKun XieSibin YuGrain chalkiness is an important grain quality related to starch granules in the endosperm. A high percentage of grain chalkiness is a major problem because it diminishes grain quality in rice. Here, we report quantitative trait loci identification for grain chalkiness using high-throughput single nucleotide polymorphism genotyping of a chromosomal segment substitution line population in which each line carried one or a few introduced japonica cultivar Nipponbare segments in the genetic background of the indica cultivar ZS97. Ten quantitative trait loci regions were commonly identified for the percentage of grain chalkiness and the degree of endosperm chalkiness. The allelic effects at nine of these quantitative trait loci reduced grain chalkiness. Furthermore, a quantitative trait locus (qPGC8-2) on chromosome 8 was validated in a chromosomal segment substitution line-derived segregation population, and had a stable effect on chalkiness in a multiple-environment evaluation of the near-isogenic lines. Residing on the qPGC8-2 region, the isoamylase gene (ISA1) was preferentially expressed in the endosperm and revealed some nucleotide polymorphisms between two varieties, Nipponbare and ZS97. Transgenic lines with suppression of ISA1 by RNA interference produced grains with 20% more chalkiness than the control. The results support that the gene may underlie qPGC8-2 for grain chalkiness. The multiple-environment trials of the near-isogenic lines also show that combination of the favorable alleles such as the ISA1 gene for low chalkiness and the GS3 gene for long grains considerably improved grain quality of ZS97, which proves useful for grain quality improvement in rice breeding programs.https://doi.org/10.1371/journal.pone.0122013 |
| spellingShingle | Wenqian Sun Qiaoling Zhou Yue Yao Xianjin Qiu Kun Xie Sibin Yu Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice. PLoS ONE |
| title | Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice. |
| title_full | Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice. |
| title_fullStr | Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice. |
| title_full_unstemmed | Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice. |
| title_short | Identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice. |
| title_sort | identification of genomic regions and the isoamylase gene for reduced grain chalkiness in rice |
| url | https://doi.org/10.1371/journal.pone.0122013 |
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