Photosynthetica, 2010 (vol. 48), issue 2

Photosynthetica 2010, 48(2):241-248 | DOI: 10.1007/s11099-010-0030-7

Photosynthetic performance of Lycoris radiata var. radiata to shade treatments

S. B. Zhou1,2,*, K. Liu1,2, D. Zhang1,2, Q. F. Li1, G. P. Zhu2
1 The Key Lab of Biological Resources Conservation and Utilization, College of Life Sciences, Anhui Normal University, Wuhu, P.R.China
2 The Key Laboratory of Molecular Evolution and Biodiversity, Anhui Normal University, Wuhu, P.R.China

The effects of shade on the growth, leaf photosynthetic characteristics, and chlorophyll (Chl) fluorescence parameters of Lycoris radiata var. radiata were determined under differing irradiances (15, 65, and 100% of full irradiance) within pots. The HI plants exhibited a typical decline in net photosynthetic rate (P N) during midday, which was not observed in MI- and LI plants. This indicated a possible photoinhibition in HI plants as the ratio of variable to maximum fluorescence (Fv/Fm) value was higher and the minimal fluorescence (F0) was lower in the, and LI plants. Diurnal patterns of stomatal conductance (g s) and transpiration rate (E) were remarkably similar to those of P N at each shade treatments, and the intercellular CO2 concentration (C i) had the opposite change trend. Under both shading conditions, the light saturation point, light compensation point and photon-saturated photosynthetic rate (P max) became lower than those under full sunlight, and it was the opposite for the apparent quantum yield (AQY). The higher the level of shade, the lower the integrated daytime carbon gain, stomatal and epidermis cell densities, specific leaf mass (SLM), bulb mass ratio (BMR), leaf thickness, and Chl a/b ratio. In contrast, contents of Chls per dry mass (DM), leaf area ratio (LAR), leaf mass ratio (LMR), leaf length, leaf area and total leaf area per plant increased under the same shade levels to promote photon absorption and to compensate for the lower radiant energy. Therefore, when the integrated daytime carbon gain, leaf area and total leaf area per plant, which are the main factors determining the productivity of L. radiata var. radiata plant, were taken into account together, this species may be cultivated at about 60∼70% of ambient irradiance to promote its growth.

Keywords: chlorophyll fluorescence; diurnal course; irradiance; leaf anatomy; leaf morphology; net photosynthetic rate; shade

Received: September 23, 2009; Accepted: April 1, 2010; Published: June 1, 2010Show citation

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Zhou, S.B., Liu, K., Zhang, D., Li, Q.F., & Zhu, G.P. (2010). Photosynthetic performance of Lycoris radiata var. radiata to shade treatments. Photosynthetica, 48(2), 241-248. doi: 10.1007/s11099-010-0030-7.
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