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During the biosynthesis process of lignin in plants, cinnamyl alcohol dehydrogenase (CAD) plays a crucial role, catalyzing the final step reaction in the entire metabolic pathway. To explore the potential functions of the CAD gene family in tea plants, CAD gene family members were identified in the genome of Huangyan tea plants and a series of bioinformatics analyses were conducted. Based on transcriptome data, the gene expression of the members in different organs of tea plants and after damage by the Empoasca vitis were studied. A total of 36 members of HD-CsCADs were identified, which were unevenly distributed on 9 chromosomes and encoded amino acid lengths ranging from 300 aa to 621 aa and protein molecular weights ranging from 321.40 kDa to 666.49 kDa. HD-CsCADs had 0 to 3 introns and the promoters containing 79 types of cis-acting elements, among which the number of elements related to stress response was the highest. Combined with the phylogenetic tree, HD-CsCADs could be divided into 4 subfamilies. There were significant differences in the expression levels of HD-CsCADs in different organs of tea plants. HD-CsCAD-15 was highly homologous to CAD genes involved in lignin biosynthesis in other plants and was highly expressed in stem tissues. In addition, the expression of the genes after damage by E. vitis on tea seedlings was analyzed. The expression of HD-CsCAD-11 and HD-CsCAD-15 was relatively obvious and could be used as important CAD genes related to lignin metabolism and tea plant defense against pests. The results would provide theoretical basis for the defense mechanism of tea plants against the small green leaf hopper and the utilization of CAD gene functions.
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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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