| Effects of blue and purple light on the growth, photosynthetic characteristics and antioxidative activities in yellow sweet pepper seedling |
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| DOI：10.7606/j.issn.1000-7601.2017.06.22 |
| Key Words: light quality yellow sweet pepper seedling growt photosynthetic characteristics chlorophyll fluorescence parameters |
| Author Name | Affiliation | | BAI Sheng-wen | College of Agriculture and Biotechnology， Hexi University, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Zhangye, Gansu 734000, China | | XU Yao-zhao | College of Agriculture and Biotechnology， Hexi University, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Zhangye, Gansu 734000, China | | ZHANG Wen-bin | Station for Popularizing Commercial Crop of Zhangye, Zhangye, Gansu 734000, China | | CHEN Xiu-bin | College of Agriculture and Biotechnology， Hexi University, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Zhangye, Gansu 734000, China | | ZU Ting-xun | College of Agriculture and Biotechnology， Hexi University, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Zhangye, Gansu 734000, China | | LI Yi-hua | College of Agriculture and Biotechnology， Hexi University, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Zhangye, Gansu 734000, China | | ZHANG Fen-qin | College of Agriculture and Biotechnology， Hexi University, Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Zhangye, Gansu 734000, China |
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| Abstract: |
| Effects of white, blue and purple light from LED on plant growth and development, chlorophyll fluorescence parameters, and other physiological characteristics were examined in the seedlings of yellow sweet pepper using substrate culturing method.It showed that,on the one hand, compared to the white light control, the treatment with blue light could improve most of the physiological and biochemical characteristics tested, including RuBP carboxylase activity, chlorophyll fluorescence parameters, lipid peroxidation, reactive oxygen species (ROS) accumulation, the activities of antioxidant enzymes, as well as the contents of antioxidant substances, such as ascorbic acid (ASA) and reduced glutathione (GSH), in the leaves. Blue light treatment also increased stem height and diameter, plant dry and fresh weights, root numbers, stomata opening, transpiration rate (Tr), stomatal conductance (Gs), net photosynthetic rate (Pn), intercellular CO2 concentration (Ci), instantaneous water utilization efficiency (IWUE), carboxylation efficiency (CE) and light utilization efficiency (LUE), PS Ⅱ photosynthetic performance index (PI), the contents of ASA and GSH, the activities of RuBP carboxylase and antioxidant enzymes of leaves. Moreover, blue light treatment promoted bud formation and flowering, whereas it suppressed leaf stomatal limiting value (Ls), superoxide anion (O2-·) production rate, the accumulation of H2O2 and lipid peroxidation products (TBARS). However, the root long, branch number, leaf area and photosynthetic pigment content were not affected by blue light. On the other hand, purple light treatment showed the almost opposite effects compared to blue light, for example, it reduced the stem height and diameter, plant dry and fresh weights, the numbers of root and leaf, root length and leaf area. Purple light also suppressed the contents of chlorophyll a,chlorophyll b and chlorophyll a+b, stomata opening, Tr, Gs, Pn, Ci, IWUE, CE and LUE, Fo, the activities of RuBP carboxylase and antioxidant enzymes in the leaves. In addition, purple light treatment increased the carotenoid content, PI, and the accumulation of O2-·, H2O2 and TBARS. However, both treatment of blue and purple light did not influence the maximum number of PSⅡ quantum yield (Fv/Fm) and potential activity of PSⅡ (Fv/Fo).The results overall suggest that blue light promoted the growth and development but purple light displayed inhibitory effects in yellow sweet pepper. |
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