Sensitivity and acclimation to UV radiation of zoospores from five species of Laminariales from the Arctic
Sensitivity and acclimation to UV radiation of zoospores from five species of Laminariales from the Arctic
复制标题
北极五种海带目游动孢子对紫外线辐射的敏感性和适应
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Schoenwaelder
中科院分区：
文献类型：
--
作者：
Chris Wiencke;M. Clayton;M. Schoenwaelder;M. Schoenwaelder
对北极斯匹次卑尔根群岛5种海带目藻类的孢子进行了光合有效辐射（PAR; 400-700 nm）、PAR+UVA辐射（UVAR; 320-400 nm）和PAR+UVAR+UVB辐射（UVBR; 280-320 nm）处理。随后，在3、6和9天的时间段内监测发芽。调查的种类有：上亚沿岸Saccorhiza dermatodea、中亚沿岸Alaria esculenta和Laminaria digitata、中亚沿岸L. saccharina和下亚滨海L.实心有蹄类。在PAR+UVAR+UVBR处理16 h后，所有树种的种子发芽率均急剧下降。然而，S.皮肤病能够从UVBR的损伤作用中恢复。种子萌发率也有小幅提高。在治疗后6-9天食用。在其他种属中无明显恢复。PAR+UVA+UVB暴露8h后，L. digitata完全恢复，L. saccharina和L.有蹄类动物对PAR+UVAR敏感的只有L.实心有蹄类。紫外线照射孢子的一个显著的细胞学特征是酚囊（囊泡）的增大（特别是在S。dermatodea和A. esculenta），其可能具有抵抗UVR的保护功能。自然辐照条件下的试点实验表明，太阳辐射的PAR分量施加额外的应力。总的来说，数据显示，游动孢子的物种从上亚沿岸是不太敏感的紫外线辐射或有能力从紫外线胁迫中恢复的物种从较深的沃茨，可能是由于他们的紫外线保护和修复能力。
Spores of five Laminariales from Arctic Spitsbergen were exposed in the laboratory to photosynthetically active radiation (PAR; 400–700 nm), PAR+UVA radiation (UVAR; 320–400 nm) and PAR+UVAR+UVB radiation (UVBR; 280–320 nm). Subsequently, germination was monitored over periods of 3, 6 and 9 days. The investigated species were the upper sublittoral Saccorhiza dermatodea, the upper to mid-sublittoral Alaria esculenta and Laminaria digitata, the mid-sublittoral L. saccharina and the lower sublittoral L. solidungula. The germination capacity decreased sharply after 16 h exposure to PAR+UVAR+UVBR in all species. However, S. dermatodea was able to recover from the damaging effects of UVBR. There was also a small increase in percentage germination of A. esculenta 6–9 days after the treatment. No recovery was evident in the other species. After 8 h exposure to PAR+UVA+UVB, L. digitata recovered completely, and L. saccharina and L. solidungula, partially. The only species susceptible to PAR+UVAR was L. solidungula. One prominent cytological feature of UVR-exposed spores was the enlargement of phenolic vesicles (physodes) (particularly seen in S. dermatodea and A. esculenta), which may have a protective function against UVR. Pilot experiments under natural irradiance conditions indicate that the PAR component of solar radiation exerts an additional stress. Overall the data show that zoospores of the species from the upper sublittoral are less sensitive to UVR or have the capacity to recover from UV stress in contrast to species from deeper waters, probably due to their UV protective and repair capabilities.