Chin J Plant Ecol ›› 2025, Vol. 49 ›› Issue (12): 2149-2165.DOI: 10.17521/cjpe.2025.0039  cstr: 32100.14.cjpe.2025.0039

Special Issue: 虚拟专辑 | 干旱响应与适应 | 整合生物学期刊集群跨刊组建

• Research Articles • Previous Articles     Next Articles

Leaf anatomical structure traits of six herbaceous plants response to different water habitats in Dajiuhu wetland, Mt. Shennongjia

WANG Ya-Xuan1,*, WANG Qian1,*, LIN Qian-Ti2, ZHANG Yi-Jia1, ZHENG Min1,**(), GU Yan-Sheng1   

  1. 1School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430078, China
    2Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong 518060, China
  • Received:2025-02-01 Accepted:2025-06-09 Online:2025-12-20 Published:2025-12-25
  • Contact: ZHENG Min
  • About author:* Contributed equally to this work
  • Supported by:
    National Natural Science Foundation of China(42077408)

Abstract:

Aims As a crucial organ for plants to conduct matter and energy exchange with the external environment, the leaf’s anatomical structure changes can directly reflect the adaptation strategies of plants to diverse habitats. The study of the anatomical structure traits of plant leaves in different habitats reflects the strategies of the wetland plants to cope with the changes in ground water level. It can provide a reference for exploring the adaptation of plants to environmental water changes. This study aims to conduct research on the dominant plants in different habitats of Dajiuhu wetland, Mt. Shennongjia, and investigate the adaptive response of plant leaf anatomical structure traits to habitats with different water levels.

Methods We selected six different habitats (xeric meadow, moderate-xeric meadow, hygrophyte-mesophyte meadow, degraded semi-hygrophyte marshes, hygrophyte herbaceous marshes, hygrophyte peat bogs) in Dajiuhu wetland in Shennongjia as the study area. Six herbaceous plants, including Carex argyi, Rhynchospora chinensis, Scirpus karuisawensis, Eragrostis pilosa, Calamagrostis pseudophragmites, Agrostis clavata were collected from the Dajiuhu wetland and the leaf anatomy of these species were studied by using paraffin sectioning method.

Important findings The results showed that: (1) the adaptation structures of different plants to the changes in habitat water level differed. Carex argyi, Rhynchospora chinensis and Scirpus karuisawensis grew in swampy habitats with good water conditions. When the water level increased, the air cavity, vascular bundle and upper and lower epidermal cell cross-section significantly increased. The leaf thickness and xylem diameter in vascular bundles increased significantly in Carex argyiand Rhynchospora chinensis; (2) Eragrostis pilosa, Calamagrostis pseudophragmitesand Agrostis clavata were distributed in drier dry and mesic meadows, and most structures in leaf transection did not show significant differences between habitats. Only the width and thickness of bulliform cells and upper epidermal cell thickness of Eragrostis pilosa, along with the lower epidermal cell thickness of Calamagrostis pseudophragmites, increased when the habitat water level decreased. Eragrostis pilosa and Agrostis clavata are C4 plants with trichomes or protuberances on the leaf surface, which may be related to the drought resistance. The developed aerenchyma and conducting tissues of Carex argyi, Rhynchospora chinensis and Scirpus karuisawensis ensured the flow of gas and water.

Key words: water level change, leaf anatomical structure trait, ecological adaptation, Poaceae, Cyperaceae