Abstract
The paper adopted the JEM-100CX II transmission electron microscope to observe chloroplast ultrastructure of five kinds of dandelion (Taraxacum) leaves in northeast, and the LI-6400 portable photosynthesis system was used to compare the chlorophyll fluorescence and the photosynthesis characteristics of five kinds of dandelions in Northeast China. Chloroplast ultrastructure showed: in the five kinds of dandelion, larger chloroplast, grana with more layers, regular thylakoid, without starch grains and so on, these chloroplasts characteristics decided to bigger photosynthetic rate. The five kinds of dandelion P(n) exhibited a "double peak" diurnal curve: stomatal limitation is the main adjustment factors for the midday depression phenomenon. The P(n),G(s),C(i) content of T. mongolicum are the highest, and T. asiaticum are the lowest among them. The relation between P(n) and G(s),C(i) is direct ratio, P(n) and T(r) is in an inverse proportion among the five kinds of dandelion. In addition, P(n) is positively correlated with Chla, Chlb, and the relationship with Chlb is bigger. The paper demonstrates the Mongolian dandelion photosynthetic efficiency is the highest, it is an higher photosynthetic efficiency dandelion,it provide theoretical basis for assessment and use of the resource of dandelion.
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