Altered seawater salinity levels affected growth and photosynthesis of <i>Ulva fasciata</i> (Ulvales, Chlorophyta) germlings

CHEN Binbin; ZOU Dinghui

doi:10.1007/s13131-015-0654-3

海水盐度变化影响裂片石莼(Ulva fasciata)(Ulvales, Chlorophyta)幼体的生长和光合作用

doi: 10.1007/s13131-015-0654-3

陈斌斌¹,
邹定辉^2,

1.
华南理工大学环境与能源学院, 广州 510006, 中国
2.
华南理工大学环境与能源学院, 广州 510006, 中国;工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006, 中国

基金项目: The National Natural Science Foundation of China under contract Nos 41276148 and 41076094.

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出版历程
- 收稿日期: 2014-04-16
- 修回日期: 2015-01-08

Altered seawater salinity levels affected growth and photosynthesis of Ulva fasciata (Ulvales, Chlorophyta) germlings

CHEN Binbin¹,
ZOU Dinghui^2
,

1.
College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
2.
College of Environment and Energy, South China University of Technology, Guangzhou 510006, China;Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China

摘要

摘要: 海水盐度在很大程度上受到潮汐、蒸发作用以及降水等的影响.本实验研究了在短时(数分钟)或长时(数天)的不同盐度处理条件下,裂片石莼(Ulva fasciata Delile)幼体的生长及光合作用响应,并评估海水盐度变化对裂片石莼生活史早期阶段的影响.结果表明,经短时间(数分钟)的低盐(25和15)或高盐海水(45)处理后,裂片石莼幼体的最大净光合作用速率(NPRm)均显著下降.但30 min后,在盐度25海水条件下,裂片石莼幼体仍保持较高的光合作用活性(70%以上).经过8 d的长时间培养,在盐度从34降低至15时,裂片石莼幼体的光合作用及相对生长速率(RGR)均显著降低,但藻体中的丙二醛(MDA)含量却逐渐增加.当盐度从34下降至25时,裂片石莼幼体的RGR的差异性不显著,但却显著地影响了幼体的形态特征.高盐条件(45)显著地降低了裂片石莼幼体的RGR及光合作用活性,却增加了藻体的MDA含量.海水盐度增加对裂片石莼幼体具有比海水淡化更大的毒害作用.无论短时或长时间培养,生长于25至34海水盐度范围内的裂片石莼幼体均表现出较好的光合适应性.裂片石莼幼体对盐度(25至34)的广泛耐受性在一定程度上与其对周期性潮汐变化的长期适应有关.
- 盐胁迫 /
- 裂片石莼 /
- 幼体 /
- 光合作用 /
- 生长 /
- 丙二醛
Abstract: Seawater salinity is greatly influenced by tide, evaporation and rain falls. In this study, we investigated the growth and photosynthetic responses of zygote-derived Ulva fasciata Delile germlings to short-term (minutes) and prolonged (days) exposure to different salinity gradients, to evaluate the effect of salinity variation on the early stage of life history in this seaweed. The results showed that, the maximum net photosynthetic rates (NPRm) of U. fasciata germlings was observably decreased in desalted (25 and 15) and high (45) salinity seawater in short-term exposure tests (in minutes). However, after 30 min, the photosynthesis activity in medium salinity (25) was maintained at a relative high level (above 70%). After 8 d prolonged culture, the photosynthesis and mean relative growth rate (RGR) of germlings were all markedly lowered, whereas the malondialdehyde (MDA) contents increased as the salinity desalted from 34 to 15. The salinity decrease from 34 to 25 had no significant effect on the RGR, but obviously influenced the morphology of the germlings. High salinity level (45) significantly depressed the RGR and photosynthesis of U. fasciata germlings, while it notably increased the MDA contents. The results showed that the salinity elevation had more detrimental effects on Ulva fasciata germlings than salinity decrease did. The germlings grown at the salinity seawater levels from 25 to 34, performed preferable photosynthetic acclimation both in temporary and prolonged culture. Broad salinity tolerance from 25 to 34 in U. fasciata germlings may have partly evolved as a response to regular diurnal tides.
- salinity stress /
- Ulva fasciata /
- germlings /
- photosynthesis /
- growth /
- malondialdehyde

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参考文献(30)

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海水盐度变化影响裂片石莼(Ulva fasciata)(Ulvales, Chlorophyta)幼体的生长和光合作用

doi: 10.1007/s13131-015-0654-3

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Altered seawater salinity levels affected growth and photosynthesis of Ulva fasciata (Ulvales, Chlorophyta) germlings

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