中文摘要：

为探讨中不同波段的光合有效辐射对钝顶螺旋藻似rthrospiraplatensis）形态、生长及光合作用的影响，实验将钝顶螺旋藻D-0083藻液转入带塞的石英管中，石英管水平置于阳光下并在其上覆盖不同的截止型和带通型滤光片，以使藻丝接受不同波段的太阳辐射；并检测其生长、形态与光合活动的变化。结果发现：所有波段f320—500、395—700、510-700和610—700nm）光合有效辐射下的藻丝均螺旋变紧且生物量增加。其中以包含少量紫外辐射A（Ultraviolet—A）的蓝光波段（320—500nm）和红光波段（600-700nm）对藻丝形态变化、生长及光合速率的诱发效率较高。在320—500、395—700、510—700和610—700am波段上的单位能量光照引起钝顶螺旋藻螺距变化的效率分别为0．070、0．015、0．021、0．045pm／（W·m）。波段320—500nm虽然会轻微抑制钝顶螺旋藻D．0083的有效光化学效率（Fv/Fm）、电子传递速率饵豫）和藻蓝蛋白的荧光发射，但是却能够有效诱导其藻丝变紧促进生长。此外，钝顶螺旋藻D-0083的藻丝变紧程度、比生长速率变化与不同波段太阳辐射下藻丝体的光合性能相一致。该研究表明任何波段的光合有效辐射都能使螺旋藻藻丝螺旋变紧并引发生长和光合作用，其中以蓝光和红光的效率最高。

英文摘要：

Light is known to regulate morphological development and photosynthetic performance of the eco- nomically important cyanobacterium, Arthrospira platensis. However, light quality under different wavelengths on its growth and physiology is yet to be understood. In this study, we grew A. platensis D-0083 trichomes in quartz tubes covered with different cutoff foils and one band-pass filter, so that the cells received different wavebands of irradiances, and measured its growth, morphology and photosynthetic performances. Spirals ofA. platensis D-0083 were compressed and the biomass increased with exposures under all wavebands. Both the wavebands ofUV-A ＋ blue light （320-500 nm） and red light （600-700 nm） could initiate the spiral compression, growth and photosynthetic activities in A. platensis D-0083 efficiently. The efficiencies per unit energy of irradiance to induce helix pitch changes in wavebands 320-500, 395-700, 510-700 and 610-700 nm were 0.070, 0.015, 0.021 and 0.045 μm/（W·m2） respectively. Waveband 320-500 nm had little suppression on effective quantum yield （Fv＇/Fm＇）, electron transfer rate （ETR） and phycocyanin （PC） fluorescence emission of the filaments but led to spiral compression and growth efficiently. The waveband-dependent responses in spiral compression and specific growth rate appeared to be consistent with the photosynthetic capability under the different light regimes.