Effects of Different Proportions of Red and Blue Light on the Growth and Physiological Characteristics of Mulberry Seedlings

doi:10.7668/hbnxb.2018.S1.027

Abstract

Abstract: In order to explore the mechanism of response of growth and development of mulberry seedlings to the combination of red and blue light. The LEDs as light sources were used in this study with 6 treatments including red light (0B),blue light (100%B) and combinations of red and blue light (15%B,20%B,30%B,50%B),white light as control,and the effects of different proportions of red and blue light on the growth,photosynthetic activity and chlorophyll content were studied to provide reference for practical application of red and blue LEDs. The results showed that red light could promote stem elongation and leaf expansion of mulberry seedlings,but caused the decrease of net photosynthetic rate (Pn),photochemical activity of photosystem Ⅱ (PSⅡ) and carbon metabolism related key enzymes activity; although the supplemental blue light (B) inhibited stem elongation and leaf expansion,yet the supplemental blue light reversed or alleviated these negative effects of red light. The supplemental blue light promoted the increase of leaf mass per unit area (LMA),Pn,photochemical activity of PS Ⅱ,chlorophyll content per unit leaf area and Rubisco activity. Compared with white light treatment,combinations of red and blue light treatment and blue light treatment,the decrease of Pn under red light was mainly due to the decrease of photochemical activity of PSⅡ,chlorophyll content,stomatal conductance (Gs),Rubisco content,and Rubisco activity. In general,the growth and physiological characteristics of mulberry plants grown under the combinations of red and blue light were similar to that of plants grown under white light (CK). These results indicated that the certain proportions of red and blue light (15%B and 20%B) could alleviate the adverse effects of monochromatic red and blue LEDs light on growth and development of mulberry seedlings. Adding blue light to red light played important roles in maintaining the photochemical activity of PSⅡ in leaves of mulberry seedlings and driving photosynthesis in leaves of mulberry seedlings.

Key words: Mulberry, Light quality, Red light, Blue light, Growth, Physiological characteristics

CLC Number:

:S572.01

HU Juwei, DAI Xin, SONG Tao, SUN Guangyu. Effects of Different Proportions of Red and Blue Light on the Growth and Physiological Characteristics of Mulberry Seedlings[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(S1): 160-169. doi: 10.7668/hbnxb.2018.S1.027.

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