• 研究报告 •

### 不同光质对桑树幼苗生长和光合特性的影响

1. 1. 金正大生态工程集团股份有限公司/养分资源高效开发与综合利用国家重点实验室/农业部植物营养与新型肥料创制重点实验室, 临沂 276700;
2. 东北林业大学生命科学学院, 哈尔滨 150040
• 收稿日期:2019-01-11 出版日期:2019-07-05 发布日期:2019-07-03
• 通讯作者: 孙广玉 E-mail:sungy@sina.com
• 作者简介:胡举伟(1988-),男,工程师,博士,主要从事植物营养生理和新型肥料研究。
• 基金资助:
作物节本增效高产关键技术研究与示范，泰山产业领军人才工程鲁科字[2016]16号；山东省重点研发计划（2016GNC110030）

### Effects of Different Light Qualities on Growth and Photosynthetic Characteristics of Mulberry Seedlings

HU Ju-Wei1, DAI Xin2, SONG Tao1, SUN Guang-Yu2

1. 1. Kingenta Ecological Engineering Group Co., Ltd. /State Key Laboratory of Nutrition Resources Integrated Utilization/Key Laboratory of Plant Nutrition and New Fertilizer Creation, Ministry of Agriculture, Linyi 276700;
2. College of Life Science, Northeast Forest University, Harbin 150040
• Received:2019-01-11 Online:2019-07-05 Published:2019-07-03
• Supported by:
Research and Demonstration on Key Technologies of Crop Cost-saving and Efficiency-increasing and High Yield,Taishan Industry Leading Talents Project,Lukezi[2016] No.16;Shandong Key Research and Development Plan(2016GNC110030)

Abstract: Light quality can influence the photosynthetic characteristics, morphology and physiological processes of seedlings. We studied the effects of different light qualities(white light, W; red light, R; blue light, B; a mixture of red and blue light, RB) using light emitting diodes(LEDs) on growth, morphology and photosynthesis of mulberry(Morus alba L. cv. Longsang No. 1) seedlings. The results showed that compared with seedlings grown under W, the dry matter accumulation of seedlings grown under R, B and RB was inhibited. The stem length and leaf area of seedlings grown under R were significantly larger than that of seedlings grown under W, RB and B. However, the leaf mass per area(LMA), chlorophyll a/b ratio, soluble protein content, sucrose and starch content, and total leaf nitrogen(N) content of seedlings grown under W, RB and B were significantly higher than that of seedlings grown under R. The net photosynthetic rate(Pn), stomatal conductance(Gs), and the actual photochemical efficiency of PSⅡ(ΦPSⅡ) of seedlings grown under RB treatment were similar to that of seedlings grown under W treatment, and the Pn and ΦPSⅡ of seedlings grown under R and B were lower than those of seedlings grown under W and RB. Antioxidant enzyme activity of seedlings grown under R, RB and B was higher than that of seedlings grown under W, yet the malondialdehyde(MDA) content of seedlings grown under R, RB and B was lower than that of seedlings grown under W. The number of leaf stomata on mulberry leaves grown under B was greater than all other treatments, and R-grown seedlings had the fewest stomata. Light quality also changed the leaf anatomical structure of mulberry seedlings. The leaf thickness, palisade tissue length and spongy tissue length of seedlings grown under R treatment significantly decreased. Hence, this study indicates that a certain ratio of mixed red and blue LEDs light could change the growth, photosynthetic characteristics, physiological characteristics, and leaf anatomy of mulberry seedlins, just like those of W-grown seedlings. Additionally, the mixed red and blue LEDs light reduced the adverse effects of monochromatic red and blue LEDs light on plant growth and development.
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