用农业和生物学科技论文的语言修改以下内容的语病：Brassinolides BLs are a a new group of phytohormones first discovered from the pollen of Brassica napus then officially named after purification and identification by Grove and

Brassinolides (BLs) are a novel group of phytohormones that were initially discovered in the pollen of Brassica napus and were officially named after their purification and identification by Grove and his colleagues in 1979. To date, more than 70 BL intermediates have been identified in various plants, collectively known as Brassinosteroids (BRs). BRs play a crucial role in regulating plant growth and development, as well as enhancing the resistance of plants to various biotic and abiotic stress factors. One active by-product of brassinolide biosynthesis is 2,4-Epibrassinolide (EBL), which has been shown to activate BR signalling in plants and improve abiotic stress tolerance in various ways. Although the exact molecular mechanism of EBL's effect on plant growth and development is not yet fully understood, it has been reported to signal cell division and interact with hormones and lipid metabolism. Exogenous application of EBL has been found to enhance plant growth and yield under drought stress, likely by improving chlorophyll contents, chlorophyll fluorescence, and the activities of enzymes involved in photosynthesis. Additionally, EBL application has been associated with an increase in cell-wall-bound invertase activity and sucrose uptake