Profiling the expression of genes controlling rice grain quality
Profiling the expression of genes controlling rice grain quality
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DOI：
10.1007/s11103-004-7507-3
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发表时间：
2005-09-01
影响因子：
5.1
通讯作者：
Sun, SSM
中科院分区：
文献类型：
--
作者：
Duan, MJ;Sun, SSM
大米是世界上一半人口的主要能量、蛋白质和其他营养物质来源。按干重计算，90%以上的水稻种子含有淀粉和蛋白质。因此，淀粉和蛋白质的数量和性质对水稻的产量和品质起着决定性的作用。淀粉的淀粉酶含量是决定稻米食味和蒸煮品质的重要因素，而储藏蛋白质的含量和必需氨基酸的平衡则影响大米的营养品质。在中国，目前处于最后开发阶段的超级杂交稻比最好的自交稻品种具有35%的产量优势。但其粮食品质还有待进一步提高。本研究报道了44个参与淀粉、贮藏蛋白和赖氨酸合成的基因在水稻籽粒发育过程中的表达模式。以已公布基因组草案的超级杂交稻LYP9的父本9311为试材。结果揭示了决定稻米品质的淀粉、蛋白质和赖氨酸的最终组成和性质所涉及的三条途径中不同但协调的基因表达谱，为稻米品质改良提供了有用的信息。
Rice provides a staple source of energy, protein and other nutrients to half of the world population. Over 90 of the rice seeds consists of starch and protein by dry weight. The quantity and property of starch and protein thus play a dominant role in the yield and quality of rice. The amylase content of starch is a determining factor in the eating and cooking quality while the amount and essential amino acids balance of storage proteins affect the nutritional quality of rice. In China, the super-hybrid rice currently under the last phase of development has a 35 yield advantage over the best inbred rice varieties. However, its grain quality needs further improvement. This study reported the expression patterns of 44 genes participating in starch, storage protein, and lysine synthesis in the developing rice grain. Field grown rice cultivar 9311, the paternal line of an elite super-hybrid rice LYP9 with its draft genomic sequence released, was used as plant material. Results revealed diverse yet coordinated expression profiles of the genes involved in the three pathways which lead to the final composition and property of starch, protein and lysine that determine the quality of rice, providing useful information for rice quality improvement.