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Plant Cell:玉米籽粒维生素E自然变异相关新的QTL位点

已有 1684 次阅读 2017-10-4 13:20 |个人分类:每日摘要|系统分类:论文交流

Novel Loci Underlie Natural Variation in Vitamin E Levels in Maize Grain


First author:Christine H Diepenbrock; Affiliations: Cornell University (康奈尔大学): Ithaca, USA

Corresponding author: Dean DellaPenna


Tocopherols (生育酚), tocotrienols (生育三烯酚类) and plastochromanols (质体色满酚) (collectively termed tocochromanols 生育色满酚) are lipid-soluble antioxidants (脂溶性抗氧化剂) synthesized by all plants. Their dietary intake (饮食摄入量), primarily from seed oils, provides vitamin E and other health benefits. Tocochromanol biosynthesis has been dissected (仔细分析或研究) in the dicot Arabidopsis thaliana, which has green, photosynthetic (光合的) seeds, but our understanding of tocochromanol accumulation in major crops, whose seeds are non-photosynthetic, remains limited. To understand the genetic control of tocochromanols in grain, we conducted a joint linkage (联合连锁) and genome-wide association study in the 5,000-line U.S. maize (Zea mays) nested association-mapping panel. Fifty-two quantitative trait loci (QTL) for individual and total tocochromanols were identified, and of the 14 resolved to individual genes, six encode novel activities affecting tocochromanols in plants. These include two chlorophyll biosynthetic enzymes (叶绿素生物合成酶) that explain the majority of tocopherol (生育酚) variation, which was not predicted, given that, like most major cereal crops, maize grain is non-photosynthetic. This comprehensive assessment of natural variation in vitamin E levels in maize establishes the foundation for improving tocochromanol and vitamin E content in seeds of maize and other major cereal crops.


生育酚、生育三烯酚类和质体色满酚,也叫做生育色满酚,是可由所有的植物合成的脂溶性抗氧化剂。饮食摄入主要是籽油,其提供维生素E和一些其他的有益物质。双子叶植物拟南芥中的生育色满酚生物合成已经有了很好的研究,拟南芥具有绿色、可进行光合作用的种子,然而对于不能够光合作用的大多数作物的籽粒中生育色满酚的积累还研究的比较少。为了理解籽粒中生育色满酚的遗传构成,作者对5,000份美国玉米材料进行了联合连锁和基因组关联分析。作者鉴定了52个单个或总生育色满酚相关的数量性状位点QTL,其中14个位点已知与单个生育色满酚相关,6个编码影响生育色满酚活性相关的蛋白。这些坚定的QTL中有两个叶绿素生物合成酶解释了大部分的生育酚变异,结合大多数谷类作物的籽粒是不能进行光合作用的显示这是未被预测到的。本文关于玉米中的天然维生素E变异的研究为后面玉米种子改良提供了基础。


通讯:Dean DellaPenna (https://bmb.natsci.msu.edu/faculty/dean-dellapenna/)


个人简介:1984年,俄亥俄大学,学士;1987年,加利福利亚大学戴维斯分校,博士。


研究方向:生化基因组学与遗传学。


doi: https://doi.org/10.1105/tpc.17.00475


Journal: the Plant Cell
FirstPublished data: October 2, 2017.

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