Salt tolerance in Phragmites australis populations from coastal Mediterranean marshes
Salt tolerance in Phragmites australis populations from coastal Mediterranean marshes
复制标题
DOI：
10.1016/s0304-3770(00)00140-6
复制
发表时间：
2001-05-01
期刊：
影响因子：
1.8
通讯作者：
Mésleard, F
中科院分区：
文献类型：
--
作者：
Mauchamp, A;Mésleard, F
通过实验研究了9个芦荟种群对土壤间隙水中盐分的响应。特林。前斯图德。来自法国地中海沿岸的沼泽。盐度从千分之0到千分之25的暴露对每个地点采集的种子萌发的影响进行了测量。发芽率达100%，盐度高于10ppm影响发芽率。在淡水中，不同种群之间的萌发差异很小(平均在89%到99%之间)，但盐分条件增加了对比度(25ppm时为5%~60%)。在一个月的持续盐溶液中，测量幼苗的生长和生物量生产。测量了25天的25ppm的临时暴露对枝条数量和长度的影响，然后在淡水中恢复。增长随着盐度的增加而下降(与淡水相比下降了50%，降至7.5‰)，死亡率为7%-100%，取决于人口，发生在15‰和20‰。不同种群在淡水条件下的累积枝长和生物量差异显著，而在盐碱条件下差异较小，生物量差异显著，长度差异不显著。暴露在25ppm的25天停止了生长，植物在用淡水冲洗后恢复了生长。胁迫对枝条长度影响显著，对枝条数影响不显著。处理结束25天后，暴露苗的枝条数与对照无明显差异。暂时的压力抑制了种群间的差异，但在随后的淡水生长过程中，这些差异得到了恢复。在实验期间观察到的变异模式与起源地目前的状况无关。(C)2001 Elsevier Science B.V.保留所有权利。
Responses to salt in soil interstitial water were studied experimentally for nine populations of Phragmites australis (Cav.) Trin. ex Steud. from coastal Mediterranean marshes in France. The effects of exposure to salinity ranging from 0 to 25 parts per thousand were measured on germination of seeds collected in each site. Germination was up to 100% and was affected by salinity above 10 parts per thousand. Variation in germination among populations was small in freshwater (ranging from 89 to 99% on average) but saline conditions increased the contrast (5-60% at 25 parts per thousand).Growth of seedlings in shoot and biomass production were measured during a a-month exposure to constant saline solutions, ranging from 0 to 20 parts per thousand. The effects on the number and length of shoots from a 25-day temporary exposure at 25 parts per thousand followed by recovery in freshwater were measured. Growth decreased with increasing salinity (50% decrease at 7.5 parts per thousand when compared to freshwater) and 7-100% mortality depending on population, occurred at 15 and 20 parts per thousand. Cumulative shoot length and biomass production varied significantly among populations in freshwater but the difference was small in saline conditions, significant for biomass but not for length. The 25-day exposure at 25 parts per thousand stopped growth and plants recovered after flushing with freshwater. The stress effect was significant for shoot length but not for shoot number. Twenty-five days after the treatment ended, the numbers of shoots were not different between exposed seedlings and controls. The temporary stress suppressed the differences among populations but they were restored during subsequent growth in freshwater. None of the variation patterns observed during the experiment were related to the present condition of the site of origin. (C) 2001 Elsevier Science B.V. All rights reserved.