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Updated: May 5, 2026

Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis

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Published on: July 23, 2014

对控制玉米 (Zea mays L.) 丝色的qSRC3的精细映射和候选基因分析

Xueying Wang¹, Yang Zhou¹, Chong You¹

¹Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, China.

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik

|March 30, 2024

概括

研究人员确定ZmMYB20为控制红玉米丝颜色的基因. 这种对光敏感的转录因子调节了氨酸生物合成,为改善新鲜玉米质量提供了洞察力.

科学领域:

植物遗传学植物遗传学
分子生物学分子生物学
农业科学农业科学

背景情况:

丝颜色对于新鲜玉米的销售能力至关重要,但对这种特性的遗传控制在很大程度上是未知的.
识别丝颜色的基因可以改善视觉吸引力和消费者对新鲜感的感知.

研究的目的:

为了精确地绘制出对玉米红丝色负责的定量特征位置 (QTL).
为了识别和表征潜在的红丝特征的候选基因.

主要方法:

使用F2种群的精细映射,该种群是由红丝玉米线和浅绿丝杂交线之间的交叉产生的.
基因表达分析,酵母单杂交试验和双露西法酶记者试验.

主要成果:

红色丝特征是由半主导的位置,qSRC3控制的,这解释了68.78%的表型变异.
编码R2R3-MYB转录因子的ZmMYB20被确定为映射区域内的关键候选基因.
ZmMYB20 直接抑制了以光依赖的方式表达氨酸生物合成基因 ZmF3H 和 ZmUFGT 的表达.

结论:

在玉米中,ZmMYB20在调节氨酸生物合成和丝颜色方面发挥着重要作用.
了解ZmMYB20的功能为开发具有理想无色丝特征的玉米提供了遗传资源.
这项研究解决了消费者对新鲜玉米外观的偏好,并为甜玉米和玉米品种的育种努力做出了贡献.

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相关概念视频

Position-effect Variegation

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.