条斑紫菜叶状体不同区域光合活性的研究

以幼嫩条斑紫菜（eorphyra yezoensisUeda）为材料，研究了叶状体基部到梢部组织的固碳率和光合活性的变化。结果表明：（1）基部到梢部不同区域组织的固碳率不同，基部区域组织固碳率明显低于其他区域，靠近梢部区域的固碳率最高；（2）基部到梢部不同区域的光合活性和叶绿素水平也不一样，基部和梢部组织的光合活性偏低...

Variations of photosynthetic activities in different tissue areas in Porphyra yezoensis thalli

In this article, young thalli of Porphyra yezoensis were used to study carbon fixation and photosynthetic activities of the five parts from the basis to the top in the same thallus. The results indicated that: (1) there were variations of carbon fixation in different tissue areas, with the basis part possessing significantly the lowest carbon fixation while the part closing to the top the highest in the five parts; (2) photosynthetic activities and chlorophyll a contents were also different among tissue areas from the basis to the top, with the photosynthetic activities of the root and the top parts lower than the other parts and the contents of chlorophyll a showing a decrease tendency from the basis to the top. It has been reported that there was higher seeding regeneration in the excised fragment from the midst locations of P. yezoensis thalli. Our results revealed higher photosynthetic activities in the middle parts, suggesting a correlation between seeding regeneration and photosynthetic activities.