Plant bHLH transcription factor is one of the key factor of ethylene and jasmonic acid hormone signal transduction pathway, and plays an important role in the yield formation and latex flow in rubber trees. A bHLH transcription factor was cloned from the leaves of Reyan73397 designed as HbbHLH48 (GenBank: PQ303617), with a total length of 1128 bp encoding 375 amino acids. Its encoded protein has the highest similarity to Arabidopsis AtbHLH48, and belongs to the XVII subgroup. Bioinformatics analysis showed that it contained the bHLH_SF superfamily domain, but did not contain the transmembrane domain and signal peptide. The expression levels in flowers, leaves and latex were higher than those in roots and stems. Mechanical injury treatment down-regulated its expression in tapping trees. Methyl jasmonate, salicylic acid, and ethephon treatments initially significantly upregulate their expression and then downregulate it, while the expression pattern with gibberellin treatment is opposite to them. Subcellular localization analysis revealed it to be in the nucleus. It can be seen that HbbHLH48 is a member of the plant bHLH transcription factor family, and its function in Hevea brasiliensis may be involved in the gibberellin process, thereby regulating the flowering process and latex biosynthesis process, laying the foundation for further in-depth research.
| 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 |