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热处理和 1-MCP 处理对杨梅(Myrica rubra Sieb. et Zucc.)果实转录组的影响分析。

Transcriptome analysis of Chinese bayberry (Myrica rubra Sieb. et Zucc.) fruit treated with heat and 1-MCP.

机构信息

Nanjing Agricultural University, No. 1 Weigang, Nanjing, 210095, PR China.

Nanjing Agricultural University, No. 1 Weigang, Nanjing, 210095, PR China; Taihu Extension Center for Evergreen Fruit of Jiangsu Province, Eastern Mountain Town, Suzhou, 215107, PR China.

出版信息

Plant Physiol Biochem. 2018 Dec;133:40-49. doi: 10.1016/j.plaphy.2018.10.022. Epub 2018 Oct 24.

Abstract

Chinese bayberry (Myrica rubra Sieb. et Zucc.) is a typical fruit tree grown in the hilly region of Southern China. The fruit is sensitive to storage and transportation conditions and presents a major problem in its commercialization. The present study was conducted to investigate the regulation of gene expression involved in plant hormone signaling pathway in the Chinese bayberry with different treatments of heat and 1-methylcyclopene (1-MCP) during postharvest storage. In one treatment group (HM group), we exposed Chinese bayberry fruit to 48 °C for 10 min and then sealed them in a desiccator with 5 μl·L of 1-MCP for 24 h at 20 °C, followed by storage at 10 °C. Another group (CK group) was directly stored at 10 °C without any prior treatment. Samples of fruit were collected every three days, at 3, 6, 9, 12 and 15 d (CK3, CK6, CK9, CK12 and CK15; and HM3, HM6, HM9, HM12, and HM15, respectively). The decay index of fruits in the CK group increased after six days of storage but did not increase until nine days of storage in the HM group. Superoxide dismutase (SOD) activity in the CK group was shown a downtrend during storage, and almost no fluctuation from six days. In the HM group, SOD activity increased after three days, but decreased sharply after six days storage. Besides, peroxidase (POD) and catalase (CAT) activities were shown the similar trend during the storage, both of them first increased and then decreased form the six days of storage. These physiological data indicated that the sixth day is a crucial time during the storage of Chinese bayberry treated with heat and 1-MCP. Therefore, the transcriptome libraries were constructed from CK0, CK6, HM6 group, respectively. The analysis of top 20 KEGG pathways showed that most differentially expressed genes were involved in the biosynthesis of secondary metabolites, particularly flavonoids and flavanols biosynthesis, in CK0 vs. CK6 and CK0 vs. HM6. However, the top three KEGG pathways in CK6 vs. HM6 were the ribosome, RNA transport and endocytosis during the storage. Expression of six ethylene receptor (ETR) genes and four ethylene-responsive transcription factor (ERF) genes were activated at transcriptional level during the postharvest stage and were decreased by heat and 1-MCP treatment, and serine/threonine-protein kinase 1 (CTR1) was also repressed by treatment. Abscisic acid (ABA) -responsive element binding factor (ABF) gene, auxin-responsive GH3 gene and transcription factor MYC2 gene also showed similar expression pattern with ethylene pathway genes. These results might improve our understanding of the mechanisms of heat and 1-MCP inhibition of fruit postharvest physiology and prolongation of fruit shelf life.

摘要

杨梅(Myrica rubra Sieb. et Zucc.)是中国南方丘陵地区特有的一种果树。杨梅果实对贮藏和运输条件敏感,在商业化过程中存在很大问题。本研究旨在探讨不同热处理和 1-甲基环丙烯(1-MCP)处理对杨梅果实采后贮藏过程中植物激素信号通路相关基因表达调控的影响。在一个处理组(HM 组)中,我们将杨梅果实暴露在 48°C 下 10 分钟,然后将其密封在干燥器中,并用 5μl·L 的 1-MCP 处理 24 小时,在 20°C 下,然后在 10°C 下贮藏。另一个组(CK 组)直接在 10°C 下贮藏,未经任何预处理。每隔三天采集果实样品,分别为 CK3、CK6、CK9、CK12 和 CK15(CK3、CK6、CK9、CK12 和 CK15);HM3、HM6、HM9、HM12 和 HM15)。CK 组果实的腐烂指数在贮藏 6 天后增加,但在 HM 组中,贮藏 9 天后才增加。CK 组中超氧化物歧化酶(SOD)活性在贮藏过程中呈下降趋势,贮藏 6 天后几乎没有波动。HM 组中,SOD 活性在贮藏 3 天后增加,但在贮藏 6 天后急剧下降。此外,过氧化物酶(POD)和过氧化氢酶(CAT)活性在贮藏过程中表现出相似的趋势,两者均在贮藏 6 天后先增加后减少。这些生理数据表明,热处理和 1-MCP 处理后的杨梅果实贮藏的第六天是一个关键时期。因此,分别从 CK0、CK6 和 HM6 组构建了转录组文库。KEGG 通路分析的前 20 个通路显示,大多数差异表达基因参与次生代谢物的生物合成,特别是黄酮类和黄烷醇类生物合成,在 CK0 与 CK6 之间以及 CK0 与 HM6 之间。然而,CK6 与 HM6 之间的前三个 KEGG 通路是核糖体、RNA 转运和内吞作用。在采后阶段,6 个乙烯受体(ETR)基因和 4 个乙烯应答转录因子(ERF)基因的表达在转录水平上被激活,并被热处理和 1-MCP 处理所抑制,丝氨酸/苏氨酸蛋白激酶 1(CTR1)也被抑制。脱落酸(ABA)反应元件结合因子(ABF)基因、生长素响应 GH3 基因和转录因子 MYC2 基因的表达模式与乙烯途径基因相似。这些结果可能有助于我们理解热处理和 1-MCP 抑制果实采后生理和延长果实货架期的机制。

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