Vivipary is a common phenomenon in nature. However, vivipary in cucumber affects seed production and processing, and it is necessary to understand the mechanism. In this study, the phenotype, physiology and transcriptome of easy-viviparous cucumber inbred line ‘D1158’ were analyzed. The vivipary manifested on the 35th day after pollination, and the viviparous germination rate reached 50 % on the 55th day after pollination. The viviparous germplasm resources were mainly concentrated in South China and North China types rather than European greenhouse and pickle types. Besides, high temperature, withered plants, and postripeness promoted vivipary. Differentially expressed genes in transcriptome were enriched in hormone signal transduction, energy and nutrient metabolism, and cellular component biosynthesis pathways. BR, CTK, IAA, and JA signals were activated, while ABA and ETH signals were inhibited in vivipary. Starch degradation and biosynthesis of soluble sugars, amino acids, fatty acids, and phenylpropanoids were up-regulated, possibly facilitating cell proliferation in vivipary. A potential regulatory pattern in the formation of vivipary in cucumber was constructed, and candidate genes were predicted. The results may enhance the comprehension of vivipary in cucumber and provide a basis for future research.

中文翻译：

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黄瓜胎菌的表型、生理学和转录组分析


胎状体是自然界中的一种常见现象。然而，黄瓜中的胎体会影响种子的生产和加工，有必要了解其机制。本研究分析了易胎生黄瓜自交系 'D1158' 的表型、生理学和转录组。胎状体在授粉后第 35 天出现，胎生发芽率在授粉后第 55 天达到 50 %。胎生种质资源主要集中在华南和华北类型，而非欧洲温室和泡菜类型。此外，高温、枯萎的植株和皮纹促进了胎动。转录组中差异表达的基因富含激素信号转导、能量和营养代谢以及细胞成分生物合成途径。BR 、 CTK 、 IAA 和 JA 信号被激活，而 ABA 和 ETH 信号在 vivipary 中被抑制。淀粉降解和可溶性糖、氨基酸、脂肪酸和苯丙烷类化合物的生物合成上调，可能促进细胞在胎体内的增殖。构建了黄瓜胎状形成的潜在调控模式，并预测了候选基因。研究结果可能增强对黄瓜胎体的理解，为未来的研究提供依据。