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在Dendrobium officinale中,DoMYB75协调调节多糖和酸生物合成

Chunmei He^1,2, Danqi Zeng^1,2,3, Mingze Zhang⁴

¹Guangdong Provincial Key Laboratory of Applied Botany, State Key Laboratory of Plant Diversity and Specialty Crops, Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.

Horticulture research

|February 16, 2026

概括

一个关键的调节器,DoMYB75,控制曼南多糖和安托素在Dendrobium officinale的生产. 这种转录因子增强了药用植物的抗氧化能力和耐旱能力.

科学领域:

植物分子生物学植物分子生物学
生物化学生物化学
药用植物的研究研究.

背景情况:

丹德罗 (Dendrobium officinale) 是一种有价值的药用植物,以其生物活性曼南多糖为名.
了解这些多糖的调节对于质量控制和治疗应用至关重要.
目前关于植物多糖生物合成调节的知识是有限的.

研究的目的:

在Dendrobium officinale中识别曼南多糖化物生物合成的关键调节剂.
调查DoMYB75在调节多糖和酸产生的作用.
探索DoMYB75对植物适应机制的影响.

主要方法:

鉴定DoMYB75作为一个转录激活剂.
对DoMYB75与细胞类合成酶A (CELLULOSE SYNTHASE-LIKE A) (DoCSLA) 和素生物合成 (DoANS) 基因促进体结合的分析.
在Dendrobium officinale中进行基因沉默和过度表达实验.
测量水溶性多糖 (WSP) 中的曼诺和葡萄糖含量.
评估总抗氧化能力和耐旱性.

主要成果:

DoMYB75直接激活了DoCSLA基因表达,促进了曼南多糖的生物合成.
沉默DoMYB75降低了曼诺糖和葡萄糖含量,而过度表达增加了它们.
DoMYB75还通过与DoANS促进体结合来激活氨酸生物合成.
过度表达DoMYB75增强了抗氧化能力和耐旱能力.

结论:

在Dendrobium officinale中,DoMYB75在调节多糖和氨酸生物合成方面发挥着双重作用.
这种转录因子是植物对干旱压力反应的关键组成部分.
结果提供了对二次代谢物和植物适应的协调调节的见解.

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