Effects of different light quality on growth, chlorophyll concentration and chlorophyll biosynthesis precursors of non-h
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ORIGINAL PAPER
Effects of different light quality on growth, chlorophyll concentration and chlorophyll biosynthesis precursors of non-heading Chinese cabbage (Brassica campestris L.) XiaoXue Fan • Jie Zang • ZhiGang Xu • ShiRong Guo • XueLei Jiao • XiaoYing Liu Ying Gao
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Received: 14 November 2012 / Revised: 28 February 2013 / Accepted: 8 May 2013 / Published online: 23 May 2013 Ó Franciszek Go´rski Institute of Plant Physiology, Polish Academy of Sciences, Krako´w 2013
Abstract The aim of this study was to evaluate the effects of different light quality of light emitting diode (LED) on the growth, concentration of chlorophyll and chlorophyll biosynthesis precursors of non-heading Chinese cabbage (Brassica campestris L.). Seedlings of the cultivar Te Ai Qing were cultured for 28 days under 6 treatments: red light (R), blue light (B), green light (G), yellow light (Y), red plus blue light (RB) and dysprosium lamp (CK). Lighting experiments were performed under controlled conditions (photon flux density 150 lmol m-2 s-1; 12 h photoperiod; 18–20 °C). The fresh and dry mass were the greatest under RB, which were significantly higher than other light treatments. The fresh mass under RB was almost twice higher compared to other light treatments. Plant height was highest
Communicated by W. Filek. X. Fan J. Zang S. Guo (&) College of Horticulture, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China e-mail: [email protected] X. Fan e-mail: [email protected] J. Zang e-mail: [email protected] Z. Xu (&) X. Jiao X. Liu Y. Gao College of Agronomy, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China e-mail: [email protected] X. Jiao e-mail: [email protected] X. Liu e-mail: [email protected] Y. Gao e-mail: [email protected]
under R treatment and was lowest under B. RB treatment also lowered the plant height significantly. The highest soluble sugar concentration was observed under B. The soluble protein concentration was the greatest under RB. The R treatment was adverse to pigment accumulation. The concentration of photosynthetic pigments and chlorophyll biosynthesis precursors were higher under RB. The RB treatment was beneficial to pigment accumulation. Keywords 5-Aminolevulinic acid Chlorophyll biosynthesis precursors LEDs Light quality Non-heading Chinese cabbage Photosynthetic pigments Abbreviations ALA B CK G LED Mg-Proto IX Pchlide PFD Proto IX R RB Y
5-Aminolevulinic acid Blue LED Dysprosium lamp Green LED Light emitting diode Mg-proporphyrin IX Protochlorophyllide Photon flux density Protoporphyrin IX Red LED Red plus blue LED Yellow LED
Introduction Among various environmental factors, light is one of the most important variables affecting the photo-morphogenesis and photosynthesis of plants (Avercheva et al. 2009). Light is also an essential energy source for plant photosynthesis and an important signal for plant growth and
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development. Changes in light quality have a profound effect on plant growth, particularly on photosynthesis (Neff et
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