Photosynthetica, 2014 (vol. 52), issue 1

Photosynthetica 2014, 52(1):152-156 | DOI: 10.1007/s11099-014-0005-1

Effects of exogenous hormones on leaf photosynthesis of Panax ginseng

X. Li1, K. Xu1,*
1 Department of Agronomy, Jilin Agricultural University, Changchun, Jilin Province, China

Ginseng (Panax ginseng) is a typical perennial shade plant. Aim of this study was to investigate the effects of exogenous hormones on photosynthesis of P. ginseng. At different growth stages, the aerial parts of P. ginseng plants were cut at the stem base and they were inserted into the nutrient solutions containing different exogenous hormones. Then the leaf photosynthesis and water absorbing capacity (absorbing water mass) of the excised plants were measured. The results showed that exogenous abscisic acid (ABA) decreased significantly net photosynthetic rate (P N), stomatal conductance, transpiration rate, and absorbed water mass of excised P. ginseng at all growth stages, while both cytokinin (CTK) and indole-3-acetic acid (IAA) enhanced those parameters. Comparing different growth stages, ABA caused more severe inhibition of leaf photosynthesis at the early growth stage, while CTK and IAA showed significant enhancement of leaf photosynthesis at later growth stage. ABA reduced highly intercellular CO2 concentration of P. ginseng at the flowering and green fruit stages, but it had only a small effect at red fruit early and red fruit stages. During the early growth stage, the inhibitory effect of ABA on leaf P N might be caused mainly due to the stomatal limitation. However, the reason for this reduction was complex at the later growth stage and it included stomatal and other factors.

Keywords: absorbed water mass; ginseng; photosynthesis

Received: August 31, 2012; Accepted: April 22, 2013; Published: March 1, 2014Show citation

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Li, X., & Xu, K. (2014). Effects of exogenous hormones on leaf photosynthesis of Panax ginseng. Photosynthetica, 52(1), 152-156. doi: 10.1007/s11099-014-0005-1.
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