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光照强度对条斑紫菜贝壳丝状体生长的影响
尚浩江1, 周伟2, 胡传明2, 申欣1, 朱朋昌1, 李帅3
1.江苏海洋大学;2.江苏省海洋水产研究所;3.上海海洋大学
摘要:
光照强度对条斑紫菜贝壳丝状体的着生、生长、发育及壳孢子放散均具有重要影响,其适宜光强的报道出入较大,有必要从生长发育、形态、光合生理角度对紫菜贝壳丝状体的适宜光强开展研究,进而为育苗阶段光照强度的调节提供数据支撑。在16℃下采用1.3-25.0 μmol/m2/s五个光照强度梯度,接种条斑紫菜Y-9101丝状体于文蛤壳并培养至壳孢子放散,利用光学与电子显微镜、色差计与叶绿素荧光仪等,测量丝状体的着生效率、水平生长速率、纵向生长率、色度值、光合活性及壳孢子放散量。结果显示,贝壳丝状体着生效率与水平生长速率均呈现先上升后下降趋势,其中18.8 μmol/m2/s下着生效率最高,达到5.6%,6.3 μmol/m2/s下水平生长速率最大,达到86.6 μm/d,纵向生长速率随光强增加而增加。6.3-18.8 μmol/m2/s下贝壳丝状体最终生长深度趋于一致、藻斑颜色均为黑色,且壳孢子放散总量高于其他处理组。25.0 μmol/m2/s下贝壳丝状体藻斑颜色偏浅黄,且壳孢子放散量较低,其实际量子效率和最大光化学量子产量低于6.3-18.8 μmol/m2/s处理组,呈现光能利用效率下降的趋势。综上所述,6.3-18.8 μmol/m2/s为条斑紫菜贝壳丝状体生长的适宜光照强度。
关键词:  光照强度、条斑紫菜、贝壳丝状体、光合活性、生长速率
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The effects of light intensities on the conchocelis of Neopyropia yezoensis
Shanghaojiang1, Zhou Wei2, Hu Chuanming2, Shen Xin1, Zhu Pengchang1, Li Shuai3
1.Jiangsu Ocean University;2.Jiangsu Marine Fisheries Research Institute,;3.Shanghai Ocean University
Abstract:
Light intensity is one of the most important influence factors on the implantation, growth, development and conchospores release of Neopyropia yezoensis shell conchocelis. The suitable light intensities range of N. yezoensis shell conchocelis was reported differently. So it was necessary to carry out the research on the suitable light intensities range of N. yezoensis shell conchocelis from different aspects, including growth, development, morphology, and photosynthetic physiology. This study promoted the light intensities management in the shell conchocelis stage of N. yezoensis cultivation with data support. N. yezoensis conchocelis of Y-9101 strain was implanted on the clam shells with five light intensities ranged of 1.3-25.0 μmol/m2/s at 16℃, and cultured until the conchospores release. The growth efficiency of shell conchocelis, horizontal growth rate, growth depth, chromatic value, photosynthetic activity and release amount of conchospores were measured and analyzed by optical microscope, scanning electron microscope, the colorimeter and the chlorophyll fluorometer. The results showed that both the implantation efficiency and horizontal growth rate of N. yezoensis shell conchocelis had an upward trend and then a downward trend. The highest implantation efficiency was 5.6% at 18.8 μmol/m2/s, and the highest horizontal growth rate was 86.6 μm/d at 6.3 μmol/m2/s. The longitudinal growth rate rose with the increase of light intensity. The final growth depth of shell conchocelis with the light intensities ranged of 6.3-18.8 μmol/m2/s was uniform, and the color of all shell conchocelis spots was black, moreover, the total release amount of conchospores was higher than other groups. The color of the shell conchocelis spots with 25.0 μmol/m2/s was slightly yellow, and the release amount of conchospores, actual quantum efficiency and maximum photochemical quantum yield with 25.0 μmol/m2/s were lower than 6.3- 18.8 μmol/m2/s groups, showed the declining light energy efficiency with 25.0 μmol/m2/s. In summary, the optimal light intensities for the growth of N. yezoensis shell conchocelis was 6.3- 18.8 μmol/m2/s.
Key words:  Light intensity, Neopyropia yezoensis, shell conchocelis, photosynthetic activity, growth rate
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