| Response of photosynthetic characteristic of various millet variety leaves to light intensity in arid region |
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| DOI：10.7606/j.issn.1000-7601.2019.01.27 |
| Key Words: millet varieties photosynthetic response curve yield |
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| Abstract: |
| In order to better understand the response of leaf photosynthesis of various millet varieties to light intensity, we used local millet varieties (Xiaohongmao), conventional variety (Longgu 11, Jingu 29), and hybrid varieties (Zhangza 5, Huada 3) as experimental crops. The photosynthetic response curves and photosynthetic parameters were studied in booting and filling stages. It is found that the maximum photosynthetic rate, apparent quantum efficience, dark respiration rate, and light compensation point in booting stage were higher than that in filling stage. At the booting stage, the apparent quantum efficiency of different millet varieties is between 0.044 and 0.079 μmol·m-2·s-1, and the light compensation point varies from 14.11 to 50.59 μmol·m-2·s-1. The maximum photosynthetic rate ranged from 38.53 to 50.01 μmol·m-2·s-1, and the dark respiration rate ranged from 2.16 to 5.28 μmol·m-2·s-1，respectively. Compared with other varieties the apparent quantum yield of Xiaohongmao (local variety) was higher (0.079 μmol·m-2·s-1), and it had a great ability to use low light intensity. Nevertheless, The maximum photosynthesis of conventional varieties and hybrid varieties was higher than local variety (Longgu 11, and Jingu 29 were 38.53 and 47.53 μmol·m-2·s-1, Zhangza 5 and Huada 3 were 44.06 and 50.01 μmol·m-2·s-1, respectively). Conventional varieties and hybrid varieties had a great ability to use highlight intensity, and hybrid variety had a stronger ability to use highlight intensity than conventional variety. Conventional varieties and hybrid varieties had a higher photosynthetic capacity, which established the foundation of high yield. |
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