Photosynthetica 2004, 42(2):213-218 | DOI: 10.1023/B:PHOT.0000040592.10133.ee

Photosynthetic Responses of Four Hosta Cultivars to Shade Treatments

J.Z. Zhang1, L. Shi1, A.P. Shi1,2, Q.X. Zhang2
1 Institute of Botany, Chinese Academy of Sciences, Beijing, P.R. China
2 Landscape Architecture Department of Beijing Forestry University,100083, Beijing, P.R. China

The effects of shade on the gas exchange of four Hosta cultivars were determined under differing irradiances (5, 30, 50, and 100 % of full irradiance) within pots. Irradiance saturation ranged between 400-800 μmol m-2 s-1 among the four cultivars, of which H. sieboldiana cv. Elegans and H. plantagenea cv. Aphrodite exerted the lowest saturation and compensation irradiances. The maximal photosynthetic rate (Pmax) was significantly higher in shade than in full irradiance in Elegans and Aphrodite, and was at maximum in seedlings grown in 30 % of full irradiance. The best shade treatment for cvs. Antioch and Golden Edger was 50 % of full irradiance. The diurnal gas exchange patterns in four cultivars were greatly influenced by the irradiance. Single-peak patterns of net photosynthetic rate (PN) and stomatal conductance (gs) were observed under 5 and 30 % full irradiance for all the cultivars while Elegans and Aphrodite suffered from midday depression in 50 % of full irradiance. Under open sky, all four cultivars showed two-peak patters in their diurnal gas exchange, but the midday depression was less in Antioch and Golden Edger than in Elegans and Aphrodite. According to their photosynthetic responses to shade, the shade tolerance of the four cultivars was in the order: Elegans>Aphrodite>Antioch>Golden Edger.

Additional key words: diurnal course; irradiance; net photosynthetic rate; shade tolerance; stomatal conductance

Published: June 1, 2004  Show citation

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Zhang, J.Z., Shi, L., Shi, A.P., & Zhang, Q.X. (2004). Photosynthetic Responses of Four Hosta Cultivars to Shade Treatments. Photosynthetica, 42(2), 213-218. doi: 10.1023/B:PHOT.0000040592.10133.ee
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