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Photosynthetic Performance and Heterogeneous Anatomical Structure in Prunus humilis under Saline–Alkaline Stress

Author

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  • Yongjiang Sun

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    Key Laboratory of Forest Silviculture and Conservation of the Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083, China)

  • Xiang Wang

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)

  • Qiwen Shao

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)

  • Qi Wang

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    Key Laboratory of Forest Silviculture and Conservation of the Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083, China)

  • Siyuan Wang

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)

  • Ruimin Yu

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)

  • Shubin Dong

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)

  • Zhiming Xin

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China)

  • Huijie Xiao

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China)

  • Jin Cheng

    (State Key Laboratory of Efficient Production of Forest Resources, Beijing 100083, China
    National Engineering Research Center of Tree Breeding and Ecological Restoration, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)

Abstract

Prunus (P.) humilis is a small woody shrub that has been widely planted in northern China due to its high nutritional value and resistance to environmental abiotic stress. However, little information about the responses of photosynthetic performance and the anatomical structure of P. humilis to saline–alkaline stress (SAS) under field conditions is available. Here, we investigated the behavior of the photosynthetic apparatus of P. humilis by measuring the chlorophyll fluorescence parameters under moderate (MS) and severe (SS) saline–alkaline stress and analyzing their relationship to leaf anatomical traits. The results showed that SAS significantly decreased the net photosynthetic rate (An) but increased the substomatal CO 2 concentration (Ci). The maximum photochemical quantum yield of PSII (Fv/Fm) and the efficient quantum yield of PSII [Y(II)] decreased under MS and SS conditions, and this decrease was greater in the distal (tip) than in the proximal (base) leaf. Compared to the leaf tip, the base of P. humilis leaves seemed to have a stronger ability to cope with MS, as was made evident by the increased quantum yield of regulated energy dissipation in PSII [Y(NPQ)] and decreased excitation pressure (1-qP). Under MS and SS conditions, the shapes of the chlorophyll a fluorescence transient (OJIP) changed markedly, accompanied by decreased PSII acceptor-side and donor-side activities. The palisade–spongy tissue ratio (PT/ST) increased significantly with increasing stress and showed a significant correlation with the chlorophyll fluorescence parameters in the leaf base. These results suggested that the activity of PSII electron transfer in the upper leaf position tended to be more sensitive to saline–alkaline stress, and a chlorophyll fluorescence analysis proved to be a good technique to monitor impacts of saline–alkaline stress on photosynthetic function, which may reflect the non-uniformity of leaf anatomy. In addition, among the anatomical structure parameters, the palisade–spongy tissue ratio (PT/ST) can be used as a sensitive indicator to reflect the non-uniform of photosynthetic function and leaf anatomy under stress.

Suggested Citation

  • Yongjiang Sun & Xiang Wang & Qiwen Shao & Qi Wang & Siyuan Wang & Ruimin Yu & Shubin Dong & Zhiming Xin & Huijie Xiao & Jin Cheng, 2024. "Photosynthetic Performance and Heterogeneous Anatomical Structure in Prunus humilis under Saline–Alkaline Stress," Agriculture, MDPI, vol. 14(9), pages 1-15, September.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:9:p:1606-:d:1478037
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