Crops ›› 2019, Vol. 35 ›› Issue (5): 125-128.doi: 10.16035/j.issn.1001-7283.2019.05.021

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Effects of Shading on Photosynthetic Characteristics and Rapid Chlorophyll Fluorescence Kinetic Characteristics of Foxtail Millet

Shi Liran1,Hao Hongbo2,Cui Haiying2,Li Mingzhe2   

  1. 1 Department of Life Science, Hengshui University, Hengshui 053000, Hebei, China
    2 Dry Farming Institute,Hebei Academy of Agriculture and Forestry Sciences, Hengshui 053000, Hebei, China
  • Received:2019-02-18 Revised:2019-06-20 Online:2019-10-15 Published:2019-11-07
  • Contact: Mingzhe Li

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Abstract:

In order to investigate the photosynthetic physiological response of millet under low light stress, Henggu 13 was used as the experimental material, and 7 different shadings were set at the seedling stage (0, 10%, 20%, 30%, 40%, 50%, 70%). Chlorophyll content, leaf area, net photosynthetic rate, yield and rapid chlorophyll fluorescence kinetic parameters were determined at the jointing and filling stages. The results showed that chlorophyll content, leaf area, net photosynthetic rate and yield of millet began to decrease when shading rate was higher than 20%. Fluorescence parameters Fo, Fm and Fv increased after shading, Fv/Fm, Fv/Fo and Pi_Abs increased gradually with the increase of shading rate, and reached the highest at shading rate 30%, then decreased and was lower than the control at shading rate 70%. NPQ_Lss gradually decreases with the increase of shading degree. Millet can be planted in sparsely forested areas with low shading.

Key words: Millet, Shading, Photosynthetic rate, Chlorophyll fluorescence

Table 1

Effects of different shading treatments on chlorophyll content, net photosynthetic rate, leaf area and yield of millet"

测定指标Measurement index 生育期
Growth stage		 遮光率Shading rate
0 10% 20% 30% 40% 50% 70%
叶绿素含量Chlorophyll content (SPAD) 拔节期Jointing stage 46.3a 46.9a 45.7a 43.6a 39.5b 36.9bc 32.4c
灌浆期Filling stage 52.9a 53.8a 51.8a 46.7b 43.4bc 40.6c 34.8d
净光合速率Net photosynthetic rate [μmol/(m2·s)] 拔节期Jointing stage 21.6a 21.8a 20.9a 17.5b 14.3c 13.1c 11.7d
灌浆期Filling stage 27.1a 28.0a 27.2a 26.0a 23.5b 19.8c 13.3c
叶面积 Leaf area (mm2) 拔节期Jointing stage 5 798a 5 810a 5 787a 5 433b 5 387b 4 770c 3 623d
灌浆期Filling stage 7 199a 7 203a 7 180a 6 957b 6 326c 5 108d 4 310e
产量Yield (kg/hm2) 5 153b 5 331a 5 130b 4 375c 4 106d 3 580e 1 792f

Table 2

Effects of different shading treatments on the fluorescence parameters Fo, Fm and Fv of millet"

测定指标
Measurement index		 生育期
Growth stage		 遮光率Shading rate
0 10% 20% 30% 40% 50% 70%
Fo 拔节期Jointing stage 9 547c 10 024b 10 067b 10 201b 10 517b 10 714b 11 216a
灌浆期Filling stage 7 282d 7 481d 7 951c 8 030c 8 680b 8 782b 10 716a
Fm 拔节期Jointing stage 34 151d 39 663c 43 077a 44 236a 42 646b 41 155b 41 005b
灌浆期Filling stage 30 575c 36 680b 36 978b 41 654a 41 345a 39 965a 40 957a
Fv 拔节期Jointing stage 24 577c 29 639b 33 010a 34 035a 32 129ab 30 441b 29 789b
灌浆期Filling stage 23 293d 29 199c 29 027c 33 624a 32 665a 31 183b 30 241b

Table 3

Effects of different shading treatments on photochemical activities of millet"

测定指标
Measurement index		 生育期
Growth stage		 遮光率Shading rate
0 10% 20% 30% 40% 50% 70%
Fv/Fm 拔节期Jointing stage 0.718c 0.746b 0.767a 0.769a 0.760a 0.740b 0.710c
灌浆期Filling stage 0.757c 0.781b 0.794a 0.807a 0.790a 0.780b 0.738d
Fv/Fo 拔节期Jointing stage 2.582c 2.938b 3.301a 3.345a 3.169b 2.855b 2.536c
灌浆期Filling stage 3.167b 3.581c 3.853b 4.196a 3.767b 3.570c 2.825e
Pi_Abs 拔节期Jointing stage 0.945b 0.993a 1.102a 1.187a 0.986b 0.969c 0.736d
灌浆期Filling stage 1.551d 1.780c 2.174b 2.392a 1.764c 1.554d 0.946e

Fig.1

Effects of different shading treatments on NPQ_Lss of millet"

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