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Rubber tree latex metabolic processes are regulated by a variety of mechanisms, among which ubiquitination modification is the most significant. The phloem protein PP2 belongs to the F-box protein family and is specifically highly expressed in latex, which may be involved in the regulation of latex regeneration. In this study, bioinformatics and expression pattern analysis were conducted on 17 F-box members of the HbPP2 gene identified in the genome of Hevea brasiliensis. The results revealed that the majority of proteins encoded by the rubber tree PP2 genes were unstable hydrophilic proteins with molecular weights ranging from 9.402 to 61.206 kDa. Phylogenetic analysis showed that the 17 HbPP2 genes in the H. brasiliensis could be divided into three subgroups (Subgroup Ⅰ, Subgroup Ⅱ, Subgroup Ⅲ), in which HbPP2 members were completely absent in subgroup I. Analysis of cis-acting elements revealed that the rubber tree PP2 gene family contained diverse functional elements involved in growth and development regulation, hormone response, and light response. Subcellular localization analysis indicated that PP2 proteins were primarily localized in chloroplasts or cytoplasm. Tissue expression analysis showed that, except for some members with tissue-specific expression, most members of the rubber tree HbPP2 family were expressed in various tissues. In latex, the expression levels of six genes, HbPP2-B1, HbPP2-B1.1, HbPP2-B10.1, HbPP2-A13.2, HbPP2-B13 and HbPP2-A15.1, were relatively high, but tapping treatment significantly upregulated the expression of HbPP2-A13.2 and HbPP2-B13. This study would provide preliminary insights into the physicochemical and expression characteristics of the HbPP2 family members in the H. brasiliensis, laying a foundation for further research on the functions of this genes family in rubber trees latex synthesis and metabolism.
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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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