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Chinese Journal of Applied Ecology ›› 2019, Vol. 30 ›› Issue (11): 3787-3794.doi: 10.13287/j.1001-9332.201911.014

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The effects of sesame/peanut intercropping on photosynthetic fluorescence characteristics in functional leaf of sesame.

WANG Fei1,2, SUN Zeng-guang1,2, JIAO Nian-yuan1,2*, XU Yong-hui1, CHEN Yue1, PING Fei1, LYU Meng1   

  1. 1College of Agriculture, Henan University of Science and Technology, Luoyang 471023, Henan, China;
    2Dryland Agricultural Engineering Technology Research Center of Henan, Luoyang 471023, Henan, China
  • Received:2018-11-14 Online:2019-11-15 Published:2019-11-15
  • Contact: * E-mail: jiaony1@163.com
  • Supported by:
    This work was supported by the Natural Science Foundation of Henan Province (182300410014), Tackling Key Scientific and Technological Problems in Henan Province (182102110180)and Provincial Innovation and Entrepreneurship Training Program for College Students in Henan University of Science and Technology (S201810464026, 201810464025)

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Abstract: To unravel functional leaf photosynthetic mechanisms underlying enhanced yield of sesame in sesame/peanut intercropping, a field experiment was carried out in 2017 and 2018 with four treatments including (1) three-row sesame intercropped with six-row peanut (IC 3:6), (2) two-row sesame intercropped with four-row peanut (IC 2:4), (3) sole cropped sesame (SS), and (4) sole cropped peanut (SP). We measured the parameters of gas exchange, characteristics of photosynthetic response curve to light and CO2, and characteristics of chlorophyll rapid fluorescence induction kinetic curves of the functional leaves of sesame. The results showed that the partial land equivalent ratio of intercropped sesame was greater than 1/3. The light saturation point (Isat), maxi-mum net photosynthetic rate (Pn max), maximum electron transport rate (Jmax), triose phosphate utilization rate (TPU), maximum carboxylation rate of Rubisco (Vc max) were increased significantly under intercropping. Further, absorption energy flux per CS (ABS/CSo), trapping energy flux per CS (TRo/CSo), number of active reaction centers per CS (RC/CSm), and electron transport flux per CS (ETo/CSo) in intercropped treatments were enhanced compared to that under sesame monoculture. However, the ratio between variable fluorescence Fk to amplitude Fj-Fo (Wk) and ratio between variable fluorescence Fj to amplitude Fp-Fo (Vj) in functional leaves of intercropped sesame were significantly decreased. The efficiency of converting light energy into electricity of PSⅡ reaction center (Ψo), electron transfer efficiency from PSⅡ to end acceptor of PSⅠ (ΨRo), electron transfer efficiency of the electron transport chain (δR), PSⅠ photochemical activity, and the coordination between PSⅡ and PSⅠ in functional leaves of intercropped sesame were increased. The net photosynthetic rate (Pn), stomatal conductance (gs), transpiration rate (Tr), Pn max, Jmax, Vc max, TPU, Ψo, ΨRo and δR were significantly higher in IC 3:6 than those in IC 2:4. We conclude that intercropping improves net photosynthetic rate and yield of sesame by increasing light absorption, electronic transmission, activity of PSⅡ donator/receptor sides, and CO2 fixation, with stronger effects in IC 3:6 than IC 2:4.