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当前位置: 首页 > 文章 > Effects of light intensity on leaf microstructure and growth of rape seedlings cultivated under a combination of red and blue LEDs 农业科学学报 (英文) 2017,16 (1)
Position: Home > Articles > Effects of light intensity on leaf microstructure and growth of rape seedlings cultivated under a combination of red and blue LEDs Journal of Integrative Agriculture 2017,16 (1)

Effects of light intensity on leaf microstructure and growth of rape seedlings cultivated under a combination of red and blue LEDs

作  者：
Yao Xu-yang;Liu Xiao-ying;Xu Zhi-gang;Jiao Xue-lei
单  位：
Nanjing Agr Univ, Coll Agron, Nanjing 210095, Jiangsu, Peoples R China
关键词：
light intensity;rape seedlings;mesophyll cell;chloroplast;stomata;photosynthetic characteristics
摘  要：
The aim of this study was to evaluate the growth of rape (Brassica napus L.) seedlings under different light intensities to select appropriate conditions for cultivation in an indoor system. Seedlings were grown under different light intensities of red and blue light provided by light-emitting diodes (LEDs) and their self-adjustment ability and changes in leaf microstructure were evaluated. Light was supplied by red LEDs with peak wavelengths of 630 (R-1) and 660 nm (R-2) and by blue LEDs (B) with a peak wavelength of 445 nm (the light intensity ratio of R-1:R-2:B was 3:3:2), at intensities of 400 (R(1)R(2)B400), 300 (R(1)R(2)B300), and 200 mu mol m(-2)s(-1)(R(1)R(2)B200). Natural solar light served as the control (C). Plant height, stem diameter, root length, leaf area, and dry weight of rape seedlings gradually increased with increasing light intensity. The seedlings in the R(1)R(2)B400 treatment grew more vigorously, while those in the R(1)R(2)B200 treatment were weaker. The photosynthetic pigment contents did not differ significantly between the R(1)R(2)B400 treatment and C, but were significantly lower in the R(1)R(2)B300 and R(1)R(2)B200 treatments. The highest intercellular CO2 conbentration, stomatal conductance, and transpiration rate were in the R(1)R(2)B300 treatment. The highest photosynthetic rate was in the R(1)R(2)B400 treatment, and was related to more compact leaves, thicker and tidier palisade and spongy tissues, and well-developed chloroplasts. In contrast, the seedlings in the R(1)R(2)B200 treatment had disordered mesophyll cells, round chloroplasts, and fractured and fuzzy grana lamellae, all of which inhibited plant growth. In conclusion, the seedlings in the R(1)R(2)B400 treatment had well-developed leaves, which favored photosynthesis. Compared with the light intensities below 300 mu mol m(-2) s(-1), the light intensity of 400 mu mol m(-2) s(-1) provided by a combination of red and blue LEDs was beneficial for cultivating strong and healthy rape seedlings in an artificial system.

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