盐度对濒危红树植物小花老鼠簕幼苗生长生理的影响  

Effect of Salinity on the Growth and Physiology of Endangered Mangrove Plant Acanthus ebracteatus Seedlings

作　　者：童立豪 高霆炜[1,2] 蓝军南 权佳惠 钟云旭 阎冰 TONG Lihao;GAO Tingwei;LAN Junnan;QUAN Jiahui;ZHONG Yunxu;YAN Bing(Guangxi Key Laboratory of Mangrove Conservation and Utilization,Guangxi Academy of Marine Sciences(Guangxi Mangrove Research Center),Guangxi Academy of Sciences,Beihai,Guangxi,536000,China;Observation and Research Station of Coastal Wetland Ecosystem in Beibu Gulf,Ministry of Natural Resources,Beihai,Guangxi,536015,China)

机构地区：[1]广西科学院,广西海洋科学院(广西红树林研究中心),广西红树林保护与利用重点实验室,广西北海536000 [2]自然资源部北部湾滨海湿地生态系统野外科学观测研究站,广西北海536015

出　　处：《广西科学院学报》2024年第3期267-276,共10页Journal of Guangxi Academy of Sciences

基　　金：广西重点研发计划项目(桂科AB21220020)资助。

摘　　要：为了探究小花老鼠簕(Acanthus ebracteatus)幼苗适宜生长的盐度,在温室内采用人工潮汐模拟系统对小花老鼠簕幼苗进行研究。本研究设置8个盐度梯度(0、5、10、15、20、25、30、35)的胁迫处理,研究盐度对小花老鼠簕幼苗生长指标和生理指标的影响。结果表明,水体盐度为0-15时,小花老鼠簕幼苗成活率为100%且生长状况良好,生物量、株高增量和基径增量均保持在较高水平;盐度≥20时,小花老鼠簕幼苗叶片脱落,出现死亡现象,且随着盐度的增加,其成活率不断下降,盐度30和35处理一周后小花老鼠簕幼苗全部死亡。随着盐度的增加,小花老鼠簕幼苗叶片内的过氧化物酶(POD)活性和脯氨酸含量呈上升趋势,且盐度20和25处理组显著高于其他处理组(P<0.05);超氧化物歧化酶(SOD)活性、可溶性糖含量、可溶性蛋白含量和丙二醛(MDA)含量先增大后减小,拐点均出现在盐度20处理组。叶绿素a、叶绿素b、初始荧光(F_(0))、最大荧光(F_(m))、可变荧光(F_(v))和相对电子传递速率(ETR)总体上呈先增后减的趋势;最大光化学效率(F_(v)/F_(m))在各处理组间均无显著差异(P>0.05)。相关性分析表明,盐度与小花老鼠簕幼苗各生长指标均呈显著负相关(P<0.05),盐度的增加对小花老鼠簕幼苗的生长产生了不同程度的抑制;盐度与小花老鼠簕幼苗各生理指标总体上呈显著正相关(P<0.05),酶活性和渗透调节物质对盐度具有较强的响应机制。综合分析表明,小花老鼠簕幼苗可生长于盐度20以下的环境中,盐度≥20对植株生长生理均产生抑制作用并导致部分植株死亡,其适宜生长的盐度为0-15。In order to explore the suitable salinity for the growth of Acanthus ebracteatus seedlings,the artificial tidal simulation system was used to study the seedlings of A.ebracteatus in greenhouse.In this study,eight salinity gradients(0,5,10,15,20,25,30,35)were applied to investigate the effects of salinity stress on the growth and physiological indexes of A.ebracteatus seedlings.The results showed that when the water salinity was 0-15,the survival rate of A.ebracteatus seedlings was 100%and the growth status was good,and the biomass,plant height increment and basal diameter increment were maintained at a high level.When the salinity was 20 and above,the leaves of the seedlings of A.ebracteatus fell off and partial death.With the increase of salinity,the survival rate decreased continuously.After one week of salinity 30 and 35 treatment,the seedlings of A.ebracteatus all died.With the increase of salinity,the peroxidase(POD)activity and proline content in the leaves of A.ebracteatus seedlings showed an upward trend,and the salinity 20 and 25 treatment groups were significantly higher than other treatment groups(P<0.05).Superoxide dismutase(SOD)activity,soluble sugar content,soluble protein content and Malondialdehyde(MDA)content increased first and then decreased,and the inflection point appeared in the salinity 20 treatment group.Chlorophyll a,chlorophyll b,initial fluorescence(F_(0)),maximum fluorescence(F_(m)),variable fluorescence(F_(v))and relative Electron Transport Rate(ETR)generally increased first and then decreased.There was no significant difference in the maximum photochemical efficiency(F_(v)/F_(m))among all treatment groups(P>0.05).Correlation analysis showed that salinity was significantly negatively correlated with the growth indexes of A.ebracteatus seedlings(P<0.05),and the increase of salinity had different degrees of inhibition on the growth of A.ebracteatus seedlings.Salinity was significantly positively correlated with the physiological indexes of A.ebracteatus seedlings(P<0.05),and the enzyme

关 键 词：红树植物 小花老鼠簕 盐胁迫 生长指标 生理指标 

分 类 号：Q945.78[生物学—植物学]