Honeysuckle cultivation relies heavily on the timing of flower bud opening. Growers prioritize varieties that hold their buds closed for longer periods because this window allows for a more efficient harvest of high-quality medicinal material. A team from Shandong University of Traditional Chinese Medicine recently identified the genetic mechanism behind this trait in the cultivar known as Huajin 6.
Researchers focused on the role of the LOX gene family, which helps control the production of jasmonic acid. By comparing the genome of Huajin 6 with other varieties, the study revealed a significant contraction in the number of LOX genes. Specifically, the plant possesses fewer copies of 9-LOX genes, which limits its ability to synthesize jasmonic acid at the critical threshold required to trigger bud expansion.
Laboratory tests confirmed that when external jasmonic acid was applied to the buds of Huajin 6, they opened rapidly. This confirms that the delayed flowering is a hormone-threshold issue rather than a lack of biological potential. The plant essentially lacks the specific genetic triggers needed to initiate the cell-wall loosening required for the bloom process to proceed on a standard timeline.
This discovery provides a concrete molecular marker for breeders. Rather than relying solely on years of field observation, developers can now target the LOX gene count to produce cultivars that maintain their quality for longer. This insight changes how scientists approach the domestication and agricultural production of medicinal herbs, turning a long-observed field trait into a predictable genetic target for future crop improvement programs.