转录因子MdNAC33参与了ALA诱导的果中安托西亚宁的积累
Liuzi Zhang1, Jiangting Zhang1, Bo Wei1
1College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China.
概括
5 - 氨基氨酸 (ALA) 促进了果中安东的积累. 一个NAC转录因子,MdNAC33,是这个过程的关键,它调节了参与氨酸生物合成的基因,并与其他调节剂相互作用.
科学领域:
- 植物科学 植物科学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 5 - 氨基乙烯酸 (ALA) 是一种植物生长调节剂,已知可以增强水果中安东的积累.
- 精确的分子机制,由此ALA诱导安托胺合成仍然在很大程度上未被阐明.
- 转录因子 (TFs) 在调节植物二次代谢物产生的过程中至关重要,包括酸盐.
研究的目的:
- 为了研究一个特定的NAC转录因子MdNAC33在果中ALA诱导的安托西亚宁积累中的作用.
- 阐明MdNAC33通过哪些分子机制来影响安素生物合成途径.
主要方法:
- 转录组分析以确定对ALA反应的TFs.
- 基因表达分析 (共表达与安东积累).
- 酵母和植物细胞测定蛋白质局部化和转录活性.
- 过度表达和RNA干扰 (RNAi) 来评估MdNAC33的功能.
- 酵母一混合 (Y1H),化酶测试和电泳运动转移测试 (EMSA) 来确定DNA结合活性.
- 蛋白质与蛋白质相互作用研究.
主要成果:
- 在果中经过ALA处理后,MdNAC33表达与安托西亚宁积累相关.
- MdNAC33是一种核局部蛋白质,具有强大的转录激活能力.
- 过度表达MdNAC33增强了氨酸水平,而RNAi沉默则损害了ALA诱导的积累.
- MdNAC33直接结合并激活关键的安托氨酸生物合成基因 (MdbHLH3,MdDFR,MdANS) 的促进者.
- MdNAC33与MdMYB1相互作用,MdMYB1是一种已知的素调节剂,形成了针对下游基因 (MdUFGT,MdGSTF12) 的调节综合体.
结论:
- 在果中,MdNAC33在调节由5-阿米诺列乌林酸诱导的氨酸生物合成方面发挥着重要且多方面的作用.
- 这项研究揭示了一种涉及MdNAC33和MdMYB1的新型调节途径,用于控制安东素的产生.
- 这些发现为植物生长调节器对二次代谢物积累的作用机制提供了新的分子洞察力.
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