外源赤霉素对东洋杜鹃花期及开花品质的影响

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Abstract：ToadressthetechicalchallngesinpreciseflowerinregulationndtoehanceteorticulturalvalueofRododedron obtusumFen TuanYuanunderprotectedcultivation.Atthebudemergencestage，FenTuanYuanweretreatedwithexogenousgibberellin （GA） at concentrations of 800mg⋅L-1 （GA1），1 200mg⋅L-1 （GA2），1 600 mg* L-1 （GA3），2 400 mg·L-1 （GA4），with water used asthecontrol（K）.oweinrdocanotentdogeousbancsndtioidntctiviisa callanalyzed.GA treatments significantlyadvancedflowering initiationand prolonged thebloomingduration.The 1600mg⋅L-1 GA treatment（GA3） exhibited the optimal effects，extended the flowering period to 36 days（ 28.6% longer than CK）. During flowering， GA3 induced the highest anthocyanin accumulation （1.8-fold higher than CK），enhanced soluble sugars （34.2%） ）andproteins （27.5%） ，andelevated SODand POD activitiesby 42.3% and 38.7% ，respectively，improving petal coloration and stress tolerance. The findings confirm that 1600mg⋅L-1 GA（GA3） during the bud emergence stage optimizes flowering synchrony and ornamental quality.TestudyprovideatheoreticalbasisandpracticalreferencefortheregulationofRhododendronobtusumfloweringperiodby exogenous GA and its commercial promotion in the flower industry.

KeyWords： Rhododendronobtusum; flowering regulation;ornamental quality;physiological characteristics

杜鹃（Rhododendronsimsii）是杜鹃花科（Ericaceae）杜鹃花属（Rhodendron）常绿或落叶灌木，是我国十大传统名花，被誉为“花中西施"。（剩余8530字）