Chinese Journal of Agrometeorology ›› 2022, Vol. 43 ›› Issue (12): 1025-1034.doi: 10.3969/j.issn.1000-6362.2022.12.007

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Growth and Physiological Responses of Two Barnyard Grass to Photoperiod Changes

JING Qing-fang, ZHU Lin, LAN Yan, ZHANG Yang, CHENG Yun-long   

  1. 1. School of Ecology and Environmental Sciences, Ningxia University, Yinchuan 750021, China; 2. Breeding Base for State Key Lab. of Land Degradation and Ecological Restoration in Northwestern China, Ningxia University, Yinchuan, 750021; 3. Key Lab. for Restoration and Reconstruction of Degraded Ecosystems in Northwestern China of Ministry of Education, Ningxia University, Yinchuan, 750021; 4.College of Agriculture, Ningxia University, Yinchuan, 750021
  • Received:2022-04-12 Online:2022-12-20 Published:2022-11-21

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Abstract: As high quality barnyard grasses, Echinochloa frumentacea and Echinochloa crusgalli were widely used to improve saline soils. In this study, three photoperiod treatments were set up by shading or artificial lighting, corresponding to day/night 8h/16h (Ph8), 12h/12h (Ph12) and 16h/8h (Ph16). Plant height, leaf width, spike weight, malondialdehyde (MDA), soluble protein, chlorophyll content, photosynthesis and chlorophyll fluorescence were investigated under different treatments, aiming to explore the growth and physiological responses of these two barnyard grasses to photoperiod changes, and provide scientific basis for the introduction of high yield and quality herbage in different regions. The results showed that:(1) with increasing light exposure, the leaf width, spike fresh and dry weight of E. frumentacea and E. crusgalli showed an “inverted V” trend, while the plant height showed an increasing trend. Additionally, the plant height, spike fresh and dry weight of E. frumentacea were higher than those of E. crusgalli under the three treatments. (2) The relationship between the MDA content of the two barnyard grasses and light exposure time exhibited a “V” pattern. (3) The soluble protein content showed an “inverted V” pattern with prolonging light exposure. (4) The net photosynthetic rate, chlorophyll content, maximum photochemical efficiency and photochemical potential activity of the two barnyard grasses showed an “inverted V” trend with increasing light exposure, and reached the maximum under Ph12 treatment. Moreover, the net photosynthetic rates of E. frumentacea were significantly higher than those of E. frumentacea. In conclusion, medium light exposure duration (12h) could significantly promote the synthesis of chlorophyll and soluble protein of E. frumentacea and E. crusgalli, enhancing photosynthesis and increase their yield. Medium light exposure duration promoted the yield of E. frumentacea more than that of E. crusgalli.

Key words: E. frumentacea, E. crusgalli, Photoperiod, Growth physiological indexes, Introduction