淹水时长与盐度对桐花树胚胎萌根与生长发育过程的影响研究  

The impacts of submergence duration and salinity on the germination and growth process of Aegiceras corniculatum radicles

作　　者：吴天亮 戴志军[3] 王日明 梁喜幸 周泰声 胡宝清 梁铭忠 欧业宁 Wu Tianiang;Dai Zhijun;Wang Riming;Liang Xixing;Zhou Taisheng;Hu Baoqing;Liang Mingzhong;Ou Yening(Key Laboratory of Environmental Change and Resource Use in Beibu Gulf,Ministry of Education,Nanning Normal University,Nanning 530001,China;Guangxi Key Laboratory of Marine Environmental Changeand Disasterin Beibu Gulf,Beibu Gulf University,Qinzhou 535011,China;State Key Laboratory of Estuarine&Coastal Research,East China Normal University,Shanghai 200062,China)

机构地区：[1]南宁师范大学北部湾环境演变与资源利用教育部重点实验室,广西南宁530001 [2]北部湾大学广西北部湾海洋环境变化与灾害研究重点实验室,广西钦州535011 [3]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《海洋学报》2023年第11期101-111,共11页

基　　金：国家自然科学重点基金项目(41930537);国家自然科学基金项目(42366009);钦州市科学研究与技术开发计划项目(20223626);广西重点研发计划项目(桂科AB21076016)。

摘　　要：潮位与盐度是影响桐花树幼苗生长发育的重要环境因子,在一定程度上决定桐花树胚胎能否成功着床与快速成苗。本文采用室内控制实验观测桐花树胚胎萌动期根系发育过程,进而探讨盐度、淹水时长、盐度-淹水时长交互作用对胚根萌发及生长的影响。结果表明:(1)模拟低低潮位淹水环境的完全浸泡胚胎24 h/d培养处理组,桐花树胚胎无法萌根。模拟中低潮位淹水环境的完全浸泡胚胎6h/d+浸泡胚根18 h/d培养处理组,胚胎平均萌根率最高,胚根最长。模拟高高潮位胚胎基部浸泡水体环境的浸泡胚根培养处理组,胚胎萌根率与平均萌根率最低,胚根数量最少。模拟高高潮位胚胎基部扎入潮滩环境的蛭石浅插培养处理组,胚根萌发最慢,萌根率最高,胚根最短、数量最多。(2)在盐度为0的环境中,培养13d后胚根最长。在盐度为10的环境中,培养后的前11d胚根最长、数量最多。在盐度为20的环境中,萌根率、平均萌根率以及胚根长度和数量明显偏低,胚根萌发与生长受到抑制。(3)淹水时长-盐度交互作用对桐花树胚根生长影响显著,若淹水时长、盐度处于桐花树胚胎萌根耐受范围内,淹水时长-盐度复合胁迫下胚胎依然能够正常萌根。人工培育桐花树幼苗,采用完全浸泡胚胎6h/d+浸泡胚根18 h/d,盐度为10培养胚根生长发育最优。研究结果可为潮间带桐花树幼苗人工培育与保护提供部分理论依据。Tide level and salinity are crucial environmental factors that significantly impact the growth and develop-ment of Aegiceras corniculatum seedlings and to a certain extent,determine if their embryos could land success-fully and develop into seedling rapidly.In this paper,the process of A.corniculatum embryos developing to seed-ings was observed by the indoor controlled experiments,during which,the effects of salinity,submergence dura-tion,as well as the interaction between salinity and submergence duration on the germination and growth of rad-icles were discussed.The results showed that:(1)the embryos of the A.corniculatum were unable to sprout in the treatment group that the embryos were soaked completely for 24 h/d in a simulated lower low tidal level of flooded environment.For the treatment group that the embryos were soaked completely for 6 h/d and the radicles soaked for 18 h/d in a simulated low to medium tidal level of flooded environment,the highest mean rooting rates and the longest radicle of the embryos were produced.In the treatment group that the base of embryos were soaked in a sim-ulated higher high tide flooded environment,the rooting rates and mean rooting rates of embryos were the lowest,accompanied by the least quantities of radicles.However,in the treatment group where the vermiculites were shal-lowly inserted into the bottom,which simulated a scene that the base of embryo was immersed within the tidal en-vironment,it was found that the radicle germination was the slowest with the highest rooting rates,and the radicles were the shortest,along with the largest quantities.(2)In the salinity environment of 0,the radicles were the longest after a 11 days cultivation.In the salinity environment of 10,highest levels in both the length and quantities of radicles were observed in the first 13 days of embryo culture.In contrast,the rooting rate and the mean rooting rate of the embryos,as well as the length and quantity of radicle were significantly smaller in the salinity environ-ment of 20,which indic

关 键 词：桐花树 淹水时长 盐度 胚根 

分 类 号：P737.1[天文地球—海洋地质]