Acta Agriculturae Boreali-Sinica ›› 2025, Vol. 40 ›› Issue (2): 10-17. doi: 10.7668/hbnxb.20195463

Special Issue: Corn Biotechnology

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

Evolution and Functional Analysis of Maize Gene ZmC4NADP-ME

CHEN Huafeng1,2,3, ZHANG Jianing4, ZHANG Xiao1, YUAN Yue1, LIU Xiufeng1, LIU Dan1,2,   

  1. 1 Tianjin Crop Research Institute,Tianjin Academy of Agriculture Sciences, Tianjin Key Laboratory of Crop Genetics and Breeding,Tianjin 300384,China
    2 Tianjin Zhongtiandadi Technology Company Limited,Tianjin 300384,China
    3 Shandong Agricultural University,Tai'an 066000,China
    4 Hebei Normal University of Science & Technology,Hebei Key Laboratory of Crop Stress Biology,Qinhuangdao 066000,China
  • Received:2024-09-27 Published:2025-04-28

Abstract:

To explore the function of key genes in photosynthesis, a functional knockout mutant (zmC4nadp-me) of ZmC4NADP-ME, the gene encoding the rate-limiting enzyme of the dark reaction of photosynthesis in maize, was obtained. Evolutionary tree analysis showed that ZmC4NADP-ME and its homologous genes exist in multiple copies in most plants, with diverse expression patterns. Phenotypic analysis revealed that the entire zmC4nadp-me plant was yellow-green, and its seedling-stage leaves dried up and died rapidly under light. Chlorophyll fluorescence analysis indicated that Y(Ⅱ) and electron transport rate ETR(Ⅱ) of photosystem Ⅱ (PSⅡ) in zmC4nadp-me decreased significantly, with little change in Y(NPQ), while the Y(NO) increased notably. Measurement of the absorption capacity (P700) of photosystem Ⅰ (PSⅠ) found that both the electron transport rate (ETR(Ⅰ)) and the actual photoelectron efficiency (Y(Ⅰ)) of zmC4nadp-me dropped substantially, and the gap widened with increasing light intensity. Under specific light intensities, Y(ND) and Y(NA) of zmC4nadp-me were greater than those of the wild type (WT). In conclusion, ZmC4NADP-ME is essential for plant growth and development. Disruption of this gene severely stresses PSⅡ, and the plant can't alleviate this stress by increasing Y(NPQ). Meanwhile, at low light intensities, the inhibition of PSⅠ may originate from the electron donor side of PSⅠ, and as the light intensity increases, the inhibition from the electron acceptor side of PSⅠ becomes a key factor.

Key words: Maize, Photosynthesis, Malate enzyme, PS Ⅰ, PS Ⅱ

Cite this article

CHEN Huafeng, ZHANG Jianing, ZHANG Xiao, YUAN Yue, LIU Xiufeng, LIU Dan. Evolution and Functional Analysis of Maize Gene ZmC4NADP-ME[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(2): 10-17. doi: 10.7668/hbnxb.20195463.

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