Molecular characterization of CeOLE6, a diverged SH oleosin gene, preferentially expressed in Cyperus esculentus tubers.

IF 3.6 3区 生物学 Q1 PLANT SCIENCES
Planta Pub Date : 2024-10-23 DOI:10.1007/s00425-024-04553-5
Zhi Zou, Xiaowen Fu, Jiaquan Huang, Yongguo Zhao
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引用次数: 0

Abstract

Main conclusion: CeOLE6, a tuber-specific gene in tigernut, encodes a diverged SH oleosin that functions in oil accumulation via homo and heteromultimerization. Tigernut (Cyperus esculentus L.) is a rare example accumulating high levels of triacylglycerols (TAGs) in underground tubers; however, the mechanism underlying is poorly understood. Given essential roles of oleosins (OLEs) in oil accumulation, in this study, structural and functional analyses were conducted for CeOLE6, an oleosin gene preferentially expressed in tigernut tubers. Phylogenetic analysis revealed that CeOLE6 encodes a diverged oleosin in Clade SH, which also includes CeOLE4 and -5. Further synteny analysis and sequence comparison indicated that CeOLE6 is more likely to be a whole-genome duplication (WGD) repeat of CeOLE4, which underwent rapid evolution and deletion of the typical C-terminal insertion for SHs. Nevertheless, CeOLE6 retains the capacity of oligomerization and oil accumulation, because (i) CeOLE6 could not only interact with itself but also with CeOLE2 and -5, two tuber-dominant members belonging to Clades SL and SH, respectively, and (ii) overexpressing CeOLE6 in tobacco leaves could significantly enhance the TAG content. Though CeWRI1 exhibits a similar expression pattern as CeOLE6 during tuber development, both CeWRI1 and -3 could not activate the CeOLE6 promoter, implying that they are not transcription factors contributing tuber-specific activation of CeOLE6. These findings not only provide insights into CeOLE genes in tuber oil accumulation, but also lay a foundation for further genetic improvement in tigernut and other species.

CeOLE6的分子特征,CeOLE6是一种在香附块茎中优先表达的SH油脂素分化基因。
主要结论虎耳草的一个块茎特异性基因 CeOLE6 编码一种分化的 SH 油苷,该油苷通过同源和异源多聚化作用于油脂积累。虎耳草(Cyperus esculentus L.)是一种在地下块茎中积累高水平三酰甘油(TAGs)的罕见植物;然而,人们对其机理却知之甚少。鉴于油脂素(OLEs)在油脂积累中的重要作用,本研究对虎耳草块茎中优先表达的油脂素基因 CeOLE6 进行了结构和功能分析。进一步的同源分析和序列比较表明,CeOLE6更有可能是CeOLE4的全基因组重复(WGD),CeOLE4经历了快速进化并删除了SHs的典型C端插入。尽管如此,CeOLE6 仍然具有寡聚和油脂积累的能力,因为(i)CeOLE6 不仅能与自身相互作用,还能与 CeOLE2 和-5(分别属于 SL 支系和 SH 支系的两个块茎优势成员)相互作用;(ii)在烟草叶片中过表达 CeOLE6 能显著提高 TAG 含量。虽然 CeWRI1 在块茎发育过程中表现出与 CeOLE6 相似的表达模式,但 CeWRI1 和 -3 都不能激活 CeOLE6 启动子,这意味着它们不是有助于激活 CeOLE6 的块茎特异性转录因子。这些发现不仅有助于深入了解CeOLE基因在块茎油脂积累中的作用,还为进一步改良虎耳草和其他物种的基因奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Planta
Planta 生物-植物科学
CiteScore
7.20
自引率
2.30%
发文量
217
审稿时长
2.3 months
期刊介绍: Planta publishes timely and substantial articles on all aspects of plant biology. We welcome original research papers on any plant species. Areas of interest include biochemistry, bioenergy, biotechnology, cell biology, development, ecological and environmental physiology, growth, metabolism, morphogenesis, molecular biology, new methods, physiology, plant-microbe interactions, structural biology, and systems biology.
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