CAJ | 학술논문

为探究植物抗盐、碱生理机制的异同,根据东北地区盐碱化草原土壤可溶性盐分的组成特点,模拟0～240 mmol/L的盐胁迫和碱胁迫条件,对苗龄8周的星星草(Puccinellia tenuiflora) 幼苗进行了胁迫处理,分析了两种胁迫下植株体内外有机酸组分及其含量的变化.结果表明:在盐胁迫和碱胁迫条件下 ,星星草茎叶中所含的有机酸均以苹果酸、草酸、柠檬酸和琥珀酸为主,但有机酸总量和比例显著不同.星星草茎叶中的有机酸总量随着碱胁迫强度的增大而急剧上升,但随着盐胁迫强度的增大而略有下降.在4种有机酸中,碱胁迫对柠檬酸含量的影响差异最大,使其构成了碱胁迫下有机酸积累的主体.对于盐、碱胁迫下星星草根系分泌物的研究表明:只有在碱胁迫条件下,星星草根系才分泌有机酸而且柠檬酸是唯一可检测出的成分.说明体内大量积累和根系分泌以柠檬酸为主的有机酸是抗碱盐植物星星草对碱胁迫的关键生理响应.
위탐구식물항염、감생리궤제적이동,근거동북지구염감화초원토양가용성염분적조성특점,모의0～240 mmol/L적염협박화감협박조건,대묘령8주적성성초(Puccinellia tenuiflora) 유묘진행료협박처리,분석료량충협박하식주체내외유궤산조분급기함량적변화.결과표명:재염협박화감협박조건하 ,성성초경협중소함적유궤산균이평과산、초산、저몽산화호박산위주,단유궤산총량화비례현저불동.성성초경협중적유궤산총량수착감협박강도적증대이급극상승,단수착염협박강도적증대이략유하강.재4충유궤산중,감협박대저몽산함량적영향차이최대,사기구성료감협박하유궤산적루적주체.대우염、감협박하성성초근계분비물적연구표명:지유재감협박조건하,성성초근계재분비유궤산이차저몽산시유일가검측출적성분.설명체내대량적루화근계분비이저몽산위주적유궤산시항감염식물성성초대감협박적관건생리향응.
The stresses triggered by the soluble salts and alkali salts of the salt-alkaline grasslands of north-eastern China were simulated.Eight-week-old Puccinellia tenuiflora seedlings were treated with either of these salts to study the differences of physiological mechanism by plants.The treatments included salt concentrations ranging from 0 to 240 mmol/L.The differences in the effects of salt stress and alkali stress were analyzed and compared by determining the changes in the quantities and compositions of organic acids in P.tenuiflora in response to salt or alkali stress.The result shows that the constituent organic acids in the shoots of P.tenuiflora were included predominantly malic acid,oxalic acid,citric acid,and succinic acid under salt stress and alkali stress.However,these two stressors led to differences in the total quantities of organic acids and the proportion of each organic acid in the total.The total content of organic acids in the shoots of P.tenuiflora increased rapidly with increased alkali-induced stress,but did not increase or even decreased slightly with increased salt stress.Of these four organic acids,the difference in the citric acid content was the most striking between salt-stressed and alkali-stressed plants,in that citric acid became the dominant component under alkali stress.The roots did not secrete any organic acid,when stress free or under salt stress,but did so under alkali stress,when citric acid was the only detectable component.Based on these results,propose that the key physiological responses of P.tenuiflora to alkali stress are the accumulation of large quantities of organic acids in its shoots and their secretion from its roots,with citric acid the dominant component.