Photosynthetica, 2017 (vol. 55), issue 1

Photosynthetica 2017, 55(1):184-192 | DOI: 10.1007/s11099-016-0219-5

Photosynthetic responses of Chrysanthemum morifolium to growth irradiance: morphology, anatomy and chloroplast ultrastructure

S. Han1,2, S. M. Chen1, A. P. Song1, R. X. Liu1, H. Y. Li1, J. F. Jiang1, F. D. Chen1,*
1 College of Horticulture, Nanjing Agricultural University, Nanjing, China
2 College of Life Science, Shangqiu Normal University, Shangqiu, Henan, China

Seedlings of Chrysanthemum, cultivar 'Puma Sunny', were grown under a range of shading regimes (natural full sunlight, 55, 25, and 15% of full sunlight) for 18 days. Here, we characterized effects of varying light regimes on plant morphology, photosynthesis, chlorophyll fluorescence, anatomical traits, and chloroplast ultrastructure. We showed that leaf color was yellowish-green under full sunlight. Leaf area, internode length, and petiole length of plants were the largest under 15% irradiance. Net photosynthetic rate, water-use efficiency, PSII quantum efficiency, and starch grain were reduced with decreasing irradiance from 100 to 15%. Heavy shading resulted in the partial closure of PSII reaction centers and the CO2 assimilation was restricted. The results showed the leaves of plants were thinner under 25 and 15% irradiance with loose palisade tissue and irregularly arranged spongy mesophyll cells, while the plants grown under full sunlight showed the most compact leaf palisade parenchyma. Irradiance lesser than 25% of full sunlight reduced carbon assimilation and led to limited plant growth. Approximately 55% irradiance was suggested to be the optimal for Chrysanthemum morifolium.

Keywords: chlorophyll; dry mass; photochemical efficiency; photosystem; gas exchange

Received: November 1, 2015; Accepted: March 8, 2016; Published: March 1, 2017Show citation

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Han, S., Chen, S.M., Song, A.P., Liu, R.X., Li, H.Y., Jiang, J.F., & Chen, F.D. (2017). Photosynthetic responses of Chrysanthemum morifolium to growth irradiance: morphology, anatomy and chloroplast ultrastructure. Photosynthetica, 55(1), 184-192. doi: 10.1007/s11099-016-0219-5.
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