[Effects of light intensity on photosynthetic characteristics and seedling growth of Prunella vulgaris].
OBJECTIVE
To study the effect of light intensity on photosynthetic characteristics and seedling growth of Prunella vulgaris under different light intensity.


METHODS
The seedling of P. vulgaris was shaded with shading net, and relative parameters were measured. The data was statistically processed.


RESULTS
With the reducing light intensity, the young plant stems became slender, the leaf long increased. The plant height and net growth under 42% full light condition were significantly higher than those under the other light intensity, chlorophy II and carotenoid contents increased, as well as Chl a/b decreased under low light. Photosynthetic indicators of P(n), T(r) decreased under low light, but CO2 concentration increased, and G(s) content decreases and then increased under 10% full light intensity.


CONCLUSIONS
P. vulgaris manifested the different plasticity and adaptability under different light intensities. The 42% light intensity was the best and the proper shading would promote the growth of seedlings.
Institute of Chinese Medicinal Materials, Nanjing Agricultural University, Nanjing 210095, China.
Lijun
L
Zhou
Hongzhuan
H
Shi
Qiaosheng
Q
Guo
Biqun
B
Han
Weiyan
W
Xian
D000222:Adaptation, Physiological; D002734:Chlorophyll / Q000378:metabolism; D008027:Light; D010788:Photosynthesis / Q000528:radiation effects*; D018515:Plant Leaves / Q000254:growth & development / Q000528:radiation effects; D018547:Plant Stems / Q000254:growth & development / Q000528:radiation effects; D031347:Prunella / Q000254:growth & development* / Q000528:radiation effects*; D036226:Seedlings / Q000254:growth & development / Q000528:radiation effects*
D002734:Chlorophyll