Identification of the pr1 gene product completes the anthocyanin biosynthesis pathway of maize.

Identification of the pr1 gene product completes the anthocyanin biosynthesis pathway of maize.
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DOI:
10.1534/genetics.110.126136
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发表时间:
2011-05
期刊:
影响因子:
3.3
通讯作者:
Chopra S
Chopra S
中科院分区:
生物学2区
文献类型:
--
作者:
Sharma M;Cortes-Cruz M;Ahern KR;McMullen M;Brutnell TP;Chopra S

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在玉米中,pr1 位点的突变导致花青素生物合成途径活跃的糊粉细胞中天竺葵素(红色)而不是花青素(紫色)色素的积累。我们对 pr1 突变进行了表征,并分离了一个假定的 F3′H 编码基因(Zmf3′h1),并通过分离分析表明红仁表型与该基因相关。使用 SNP 标记进行遗传图谱确认其在 5L 染色体上的位置。此外,使用 CaMV 35S::ZmF3'H1 启动子基因构建体进行的遗传互补实验证实,编码的蛋白质产物足以进行 3'-羟基化反应。在 Pr1 植物的花和营养组织中检测到 Zmf3'h1 特异性转录本,但在 pr1 中不存在。对四个 pr1 等位基因进行了表征:两个在 5' 上游启动子区域携带 24 个 TA 二核苷酸重复插入,第三个在 TATA 框附近有 17 bp 缺失,第四个在外显子 1 中包含 Ds 插入。遗传和转录分析表明,pr1 基因受到花青素转录因子 red1 和 colorless1 的调控。 pr1的克隆和表征完成了编码玉米花青素途径结构酶的所有基因的分子鉴定。
In maize, mutations in the pr1 locus lead to the accumulation of pelargonidin (red) rather than cyanidin (purple) pigments in aleurone cells where the anthocyanin biosynthetic pathway is active. We characterized pr1 mutation and isolated a putative F3′H encoding gene (Zmf3′h1) and showed by segregation analysis that the red kernel phenotype is linked to this gene. Genetic mapping using SNP markers confirms its position on chromosome 5L. Furthermore, genetic complementation experiments using a CaMV 35S::ZmF3′H1 promoter–gene construct established that the encoded protein product was sufficient to perform a 3′-hydroxylation reaction. The Zmf3′h1-specific transcripts were detected in floral and vegetative tissues of Pr1 plants and were absent in pr1. Four pr1 alleles were characterized: two carry a 24 TA dinucleotide repeat insertion in the 5′-upstream promoter region, a third has a 17-bp deletion near the TATA box, and a fourth contains a Ds insertion in exon1. Genetic and transcription assays demonstrated that the pr1 gene is under the regulatory control of anthocyanin transcription factors red1 and colorless1. The cloning and characterization of pr1 completes the molecular identification of all genes encoding structural enzymes of the anthocyanin pathway of maize.
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