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Pineapple is prone to intern browning during storage at room temperature. Diseased and healthy parts of pineapple at early stage of intern browning were used to explore the mechanism of the disease. Three samples from each part were used for transcriptome RNA-Seq analysis. GO, KEGG, cluster analysis of gene expression in various metabolic pathways, and RT-qPCR validation on differential genes were performed and the differential gene expression levels between the diseased (IB) and healthy (WT) parts were compared. IB vs WT had 1037 differentially expressed genes, of which 886 were up-regulated and 130 were down-regulated. GO and KEGG analysis found that the differentially expressed genes in amino acid biosynthesis were the most significant, and the proportion of differentially expressed genes was large. Cluster analysis and RT-qPCR validation found that the sugar metabolism pathway significantly up-regulated the expression levels of related enzyme genes in glycolysis, tricarboxylic acid cycle (TCA), and oxidative phosphorylation processes after fruit disease onset. The response of plants to external environmental signaling pathways revealed a significant down-regulation of resistance enzyme gene expression, a significant up-regulation of pathogenic protein gene expression, and a significant down-regulation of resistance protein gene expression. The antioxidant pathway revealed significant down-regulation of glutathione synthesis gene expression, significant up-regulation of flavonoid biosynthesis related gene expression, significant down-regulation of L-ascorbate peroxidase (APX) gene expression, and significant up-regulation of L-ascorbate oxidase (AOX) homologous gene expression. RNA-Seq and RT-qPCR analysis indicated that pineapple tissue significantly up-regulated key genes in sugar metabolism to accelerate sugar metabolism in fruit disease part, significantly up-regulated key genes in the MAPK signaling pathway, and significantly down-regulated metabolic pathway changes such as antioxidant substances, leading to pineapple intern browning. The results could enrich the gene network of pineapple intern browning and provide a valuable reference for the subsequent gene screening of pineapple intern browning.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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