摘要
为研究不同盐度下红树植物的生理适应性,测定了木榄(Bruguiera gymnorhiza)、角果木(Ceriops ta⁃gal)、红海榄(Rhizophora stylosa)、海莲(Bruguiera sexangula)、桐花树(Aegiceras corniculatum)、秋茄(Kandelia obo⁃vata)6种红树幼苗在8种盐度(0、5%、10%、15%、20%、25%、30%、35%)下的生长量、株高增量、基径增量、净光合速率、叶绿素a含量、叶绿素b含量、叶绿素总量、超氧化物岐化酶(SOD)活性、脯氨酸(Pro)含量以及丙二醛(MDA)含量。结果显示:6种红树幼苗适宜生长的盐度为5%~20%,其中桐花树具有较高的耐盐性。在盐胁迫下,6种红树植物幼苗的SOD酶活性、Pro含量和MDA含量均升高,叶绿素含量升高,净光合速率下降,生长速度减慢。研究表明,红树物种受到盐胁迫时,净光合速率降低,幼苗通过增加叶绿素含量提升光合作用,并通过增加叶片中SOD酶活性、Pro含量和MDA含量,提高植物抗逆性。
To investigate the physiological adaptability of mangrove plants under different salinity,the influences of different salinity(0,5%,10%,15%,20%,25%,30%,35%)on the growth of six mangrove species(Bruguiera gymnorhiza,Ceriops tagal,Rhizophora stylosa,Bruguiera sexangula,Aegiceras corniculatum,Kandelia obovata)were assayed,and the morphological and physiological characteristics of six species were determined respectively,including the biomass,plant height increment,base diameter increment,net photosynthetic rate,chlorophyll a content,chlorophyll b content,total chlorophyll content,superoxide dismutase(SOD)activity,proline(Pro)content and malondialdehyde(MDA)content.The results showed that the 5%-20%was suitable salinity for the growth of six mangrove seedlings,and the Parmentiera cerifera had high salt tolerance.The SOD activity,Pro content and MDA content and chlorophyll content of six mangrove seedlings increased,but net photosynthetic rate and growth rate decreased under salt stress.The results showed that the photosynthesis of the six species seedlings decreased under salt stress,the photosynthetic rate increased by increasing the chlorophyll content,and the plant stress resistance might be improved by increasing the SOD activity,Pro content and MDA content in the leaves.
作者
方发之
桂慧颖
黎肇家
张晓凤
FANG Fazhi;GUI Huiying;LI Zhaojia;ZHANG Xiaofeng(Hainan Academy of Forestry,Hainan Academy of Mangrove,Haikou 571000)
出处
《植物研究》
CAS
CSCD
北大核心
2023年第6期881-889,共9页
Bulletin of Botanical Research
基金
海南省重大科技计划项目(ZDKJ202008)。
关键词
红树植物幼苗
盐胁迫
生长指标
生理指标
适应性
mangrove seedlings
salt stress
growth indicators
physiological index
adaptability
