Monocropping is one of cultivation systems for many crops in production, especially for
Pseudostellariae heterophylla, one of Chinese herbal medicinal plants.
Continuous cropping will cause a series of problem. In the paper, we designed a continuous cropping of
Pseudostellariae heterophylla and rotaton of
Pseudostellariae heterophylla and rice to explore effects on photosynthetic physiology and medicinal quality of
P. heterophylla. The results showed that compared to the rotation, the yield of continuous cropping of
P. heterophylla was significantly (
P<0.01) declined, only
corresponding to one third of the rotation’s, polysaccharide content and ginseng saponins Rb1 of the tuberous root reduced by 88.08% and 44.33%, respectively. The dynamic measurement of FluorCam fluorescence indicated that
Fo was not declined significantly (
P>0.05), and NPQ decreased significantly (
P<0.05). The relative chlorophyll content of leaf (SPAD) (
P<0.01) and
Pn (
P<0.05) declined. The decreased cell density in leaf and root was observed with microscope. In conclusion, the photosynthetic system was damaged by continuous cropping, especially for the protection mechanism. The light energy absorbed by PSII antenna pigment cannot be used in photosynthesis or dissipated, but accumulated in the leaves, which causes disordered photosynthesis, declined photosynthetic rate and malformed organs. The pathologic, and finally affects the morphogenesis of root that may be an important faction in restricting the yield and quality of
P. Heterophylla.
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