Effects of the red:far-red light ratio on photosynthetic characteristics of greenhouse cut Chrysanthemum - Short communication

Z.Q. Yang, Y.X. Li, J.B. Zhang, J. Zhang, J. Zhu, L.L. Gu and B. Zhang
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Z.Q. Yang: Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science Technology, Nanjing, China
Y.X. Li: Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science Technology, Nanjing, China
J.B. Zhang: College of Applied Meteorology, Nanjing University of Information Science Technology, Nanjing, China
J. Zhang: College of Applied Meteorology, Nanjing University of Information Science Technology, Nanjing, China
J. Zhu: College of Applied Meteorology, Nanjing University of Information Science Technology, Nanjing, China
L.L. Gu: College of Applied Meteorology, Nanjing University of Information Science Technology, Nanjing, China
B. Zhang: College of Applied Meteorology, Nanjing University of Information Science Technology, Nanjing, China

Horticultural Science, 2013, vol. 40, issue 1, 40-43

Abstract: For the use of LED as a light source to regulate the photosynthesis of chrysanthemum leaves under greenhouse conditions, the effects of different red (660 ± 30 nm) to far-red (730 ± 30 nm) radiation ratios (R:FR) on the photosynthetic characteristics and chlorophyll fluorescence parameters of chrysanthemum leaves were studied. Red and far-red LED light sources were combined in different proportions to produce four R:FR ratio treatments: 0.5, 2.5, 4.5 and 6.5. The chlorophyll a content, SPAD value, net photosynthetic rate, light-saturated maximum photosynthetic rate, CO2-saturated carboxylation rate, apparent quantum efficiency and carboxylation efficiency were all the highest under the R:FR ratio of 2.5, followed by the R:FR ratio of 4.5. Potential photochemical efficiency of photosystem II, photochemical quenching and electron transport rate for the R:FR ratios of 2.5 and 4.5 were markedly higher than those for 0.5 and 6.5, however, those parameters did not differ significantly between the R:FR ratios of 2.5 and 4.5.

Keywords: chrysanthemum; R:FR; LED; photosynthesis; chlorophyll fluorescence (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlhor:v:40:y:2013:i:1:id:43-2012-hortsci

DOI: 10.17221/43/2012-HORTSCI

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