摘要
为突破设施栽培中杜鹃花期精准调控技术瓶颈,提升园艺观赏品质与商品附加值,以东洋杜鹃粉团圆为研究对象,在现蕾期喷施800 mg·L^(-1)(GA1)、1200 mg·L^(-1)(GA2)、1600 mg·L^(-1)(GA3)、2400 mg·L^(-1)(GA4)浓度赤霉素,以清水处理为对照(CK),通过比较分析不同浓度赤霉素对粉团圆的花期动态、花色苷含量、内源物质代谢和抗氧化酶系统等指标变化,探讨外源赤霉素对其花期调控和开花品质的影响。结果表明,各浓度赤霉素处理均能显著提前粉团圆的开花时间并延长花期,其中以1600 mg·L^(-1)GA3处理效果最为显著,花期延长至36 d(较CK延长28.6%)。开花关键期,GA3处理的花青素积累量达最高水平(较CK提高1.8倍),可溶性糖含量较CK提升34.2%,蛋白质含量提升27.5%;同时,超氧化物歧化酶(SOD)和过氧化物酶(POD)活性分别较CK增强42.3%和38.7%,有效改善了花瓣着色能力并提高了植株抗逆性。综上,现蕾期喷施1600 mg·L^(-1)(GA3)赤霉素有利于提前开花、极显著延长花期和提高综合观赏品质。研究结果为外源赤霉素对杜鹃花期调控及在花卉产业商业化推广提供了理论依据与实践参考。
To address the technical challenges in precise flowering regulation and to enhance the horticultural value of Rhododendron obtusum Fen Tuan Yuan under protected cultivation.At the bud emergence stage,Fen Tuan Yuan were treated with exogenous gibberellin(GA)at concentrations of 800 mg·L^(-1)(GA1),1200 mg·L^(-1)(GA2),1600 mg·L^(-1)(GA3),2400 mg·L^(-1)(GA4),with water used as the control(CK).Flowering period,anthocyanin content,endogenous substances,and antioxidant enzyme activities were systematically analyzed.GA treatments significantly advanced flowering initiation and prolonged the blooming duration.The 1600 mg·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%)and proteins(27.5%),and elevated SOD and POD activities by 42.3%and 38.7%,respectively,improving petal coloration and stress tolerance.The findings confirm that 1600 mg·L^(-1)GA(GA3)during the bud emergence stage optimizes flowering synchrony and ornamental quality.The study provide a theoretical basis and practical reference for the regulation of Rhododendron obtusum flowering period by exogenous GA and its commercial promotion in the flower industry.
作者
付麟岚
章志红
蒋嘉伟
FU Linlan;ZHANG Zhihong;JIANG Jiawei(Jiangsu Urban and Rural Construction Vocational College,Changzhou,Jiangsu 213147,China;China Construction Bank Research Center,East China Training Institute,Changzhou,Jiangsu 213023,China)
出处
《天津农业科学》
2025年第8期1-6,共6页
Tianjin Agricultural Sciences
基金
2022年度江苏省高等学校基础科学(自然科学)研究重大项目(22KJA210002)
江苏省高校优秀科技创新团队资助项目(苏教科〔2023〕3号)
江苏省低碳建材与城乡生态工程研究中心项目(苏发改高技发〔2021〕1368号)
江苏省传统营造工程技术中心(苏建人〔2021〕69号)。
关键词
东洋杜鹃
花期调控
观赏品质
生理生化特性
Rhododendron obtusum
flowering regulation
ornamental quality
physiological characteristics
