Photosynthetica, 2008 (vol. 46), issue 1

Photosynthetica 2008, 46(1):17 | DOI: 10.1007/s11099-008-0004-1

Effects of irradiance on growth, photosynthetic characteristics, and artemisinin content of Artemisia annua L.

M. L. Wang1, Y. S. Jiang1, J. Q. Wei1, X. Wei1,*, X. X. Qi1, S. Y. Jiang1, Z. M. Wang2
1 Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and Academia Sinica, Guilin, P.R. China
2 South China Botanical Garden, the Chinese Academy of Sciences, Guangzhou, P.R. China

With an increase in growth irradiance (from 15 to 100 % of full sunlight, I15 to I100), the maximum net photosynthetic rate (P max), compensation (CI) and saturation irradiances of A. annua increased. At full sunlight, A. annua had a high capacity of photosynthesis, while at low irradiance it maintained a relatively high P max with a low CI. The height and diameter growth, total and leaf biomass, and artemisinin content of A. annua decreased with the decrease in irradiance, which might be connected with lower photosynthesis at lower than at higher irradiance. Irradiances changed biomass allocations of A. annua. The leaf/total mass ratio of A. annua increased with decreasing irradiance, but the root/total mass ratio and root/above-ground mass generally increased with increasing irradiance. Thus A. annua can grow in both weak and full sunlight. However, high yield of biomass and artemisinin require cultivation in an open habitat with adequate sunshine.

Keywords: biomass allocation; diameter; growth; root; seasonal course

Received: March 6, 2007; Accepted: July 23, 2007; Published: March 1, 2008Show citation

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Wang, M.L., Jiang, Y.S., Wei, J.Q., Wei, X., Qi, X.X., Jiang, S.Y., & Wang, Z.M. (2008). Effects of irradiance on growth, photosynthetic characteristics, and artemisinin content of Artemisia annua L. Photosynthetica, 46(1), 17. doi: 10.1007/s11099-008-0004-1.
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