Correlation of seed germination capacities under salt stress with four plant species distribution in the Hangzhou Bay Wetlands
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摘要: 为了探明杭州湾湿地植物碱蓬Suaedae glauca，南方碱蓬Suaeda australis，芦苇Phragmites australis和野艾蒿Artemisia lavandulaefolia等各自生境土壤盐分高低是否和种子在盐分胁迫下的萌发能力相一致，试验比较了它们所在生境的土壤含盐量、pH值及含水率，测定了4种植物种子在不同质量浓度氯化钠（NaCl）（0~50 gL－1）溶液处理下的萌发率，并分析了土壤含盐量、pH值和含水率和20 gL－1氯化钠溶液处理的种子萌发率之间的相关性。结果表明，各物种生境土壤含盐量顺序是南方碱蓬＞碱蓬＞芦苇＞野艾蒿；土壤pH 值为芦苇＞野艾蒿＞南方碱蓬和碱蓬；土壤含水率为碱蓬＞芦苇＞南方碱蓬＞野艾蒿。氯化钠溶液处理对4种种子萌发率都有显著影响，萌发率随盐分质量浓度增加而下降；同一盐分质量浓度下，萌发率高低顺序依次是碱蓬＞南方碱蓬＞芦苇＞野艾蒿。复水后氯化钠溶液处理的种子萌发率都显著提高，但不同物种萌发率高低顺序和复水前相同。相关分析表明，土壤含盐量和不同种子在20 gL－1氯化钠胁迫下的萌发率是显著相关的。这些结果表明，土壤含盐量是限制上述4种种子萌发的重要因素；4种植物的分布是和它们各自生境的盐分高低条件和种子在盐分胁迫条件下的萌发能力相关的。图2表2参17Abstract: In the Hangzhou Bay Wetlands，plant species occupy different habitats. It is not clear whether the distribution pattern of plant species was related to their ability to germinate under salt stress conditions. Soils from the habitats of four populations of Suaeda glauca，Suaeda australis，Phragmites australis，and Artemisia lavandulifolia were sampled respectively and soil salt content，pH，and water content were analyzed and compared. The percent germination of their seeds when exposed to 0-50 gL-1 NaCl solution was measured by germinating 30 seeds in three Petri dishes respectively in an illumination incubator at 28 ℃. Finally，correlation between germination percent of seeds for the four species exposed to a 20 gL-1 NaCl solution versus soil salt content，pH，and water content was analyzed. Results for the four species showed that the soil salt content of the growth habitats was S. glauca ＞ S. australis ＞ P. australis ＞ A. lavandulifolia；soil pH was P. australis ＞ A. lavandulifolia ＞ S. glauca and S. australis；and soil water content was S. glauca ＞ P. australis ＞ S. australis ＞ A. lavandulifolia. With the NaCl solution （0-50 gL-1），the percent germination decreased significantly （P ＜ 0.001） with increase in NaCl concentration. For the same level of NaCl concentration，the percent germination was S. glauca ＞ S. australis ＞ P. australis ＞ A. lavandulifolia. After replacement of NaCl solution （0-50 gL-1） with distilled water，the seed germination percent remarkably increased （P ＜ 0.01）. But the final germination capacity was in the same order as before the replacement. In addition，only the soil salt content was strongly related to percent germination of the four seed-types exposed to 20 gL-1 NaCl solution （P ＜ 0.05）. These results indicated that soil salt content was an important limiting factor for seed germination, and the distribution pattern of the four plant species was generally related to their habitats soil salt content and the ability of the seeds to germinate at high NaCl concentrations.［ch，2 fig. 2 tab. 17 ref.］
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Key words:
- plant physiology /
- Hangzhou Bay Wetlands /
- salt stress /
- seed germination /
- soil salt content /
- correlation
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2012.05.017
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