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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (1): 75-88.DOI: 10.11686/cyxb2023085

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Leaf structure, physiology and transcriptome analysis of Salsola collina in response to drought stress

Jiong-rui TAN1(), Tong-gang ZHA2(), Ze-yu ZHANG2, Xiao-xia ZHANG3, Hong-mei TENG1, Ling-li WANG1, Li-li ZHAO4, Ao WANG4, Xin-yao WANG1   

  1. 1.Department of Life Science,Yuncheng University,Yuncheng 044000,China
    2.College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China
    3.The Third Construction Co. ,Ltd. of China Construction First Construction Group,Beijing 100161,China
    4.Beijing Badaling Forest Farm,Beijing 102112,China
  • Received:2023-03-21 Revised:2023-05-31 Online:2024-01-20 Published:2023-11-23
  • Contact: Tong-gang ZHA

Abstract:

This research investigated the phenotypic, physiological and molecular mechanism of Salsola collina response to drought stress. Plants were cultivated in pots under a controlled, declining soil moisture regime, falling from 80% to 50% of field water holding capacity over 28 days with sample collection at 0, 7, 14 and 28 days.It was found that the palisade tissue changed from dense to sparse and the crystal clusters disappeared initially and then increased across the 28 days of increasing drought stress. The thickness of aqueous tissue initially increased and then decreased (P<0.05). The area of the main vascular bundle and epidermis thickness after 28 days of drought stress [(3099.72±151.88) μm2 and (23.73±0.68) μm, respectively] were significantly increased compared to control [(2065.41±80.08) μm2 and (13.71±1.26) μm] (P<0.05). Again with increasing drought stress in 28-day-old seedlings, the leaf thickness increased but the area decreased (P<0.05). Chlorophyll content decreased gradually (P<0.05), superoxide dismutase (SOD) and peroxidase (POD) activities, proline and malondialdehyde (MDA) contents increased significantly (P<0.05), H2O2 increased significantly at 14 days (P<0.05), soluble protein content increased initially, then decreased under medium stress and increased under high stress (P<0.05). Compared with day 0, there were 103, 1560 and 270 differentially expressed genes (DEGs) detected at 7, 14 and 28 days of drought stress, respectively. Gene ontology (GO) enrichment analysis showed that DEGs were significantly enriched in protein phosphatase type Ⅰ complex, integral components of membranes, oxidation-reduction process and oxidoreductase activity, among others. The Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis showed that the genomes were significantly concentrated on oxidative phosphorylation, ribosome and phototransduction pathways. Abiotic stresses pathway DEGs analysis showed that heat shock protein genes, glutathione peroxidase 2 (GPX2), PODSOD, calcium-dependent protein kinase 19 (CPK19) and CBL-interacting protein kinase 9 (CIPK9), MAP kinase genes, transcription factor protein degradation pathway genes, UDP-glucuronate decarboxylase 1UXS1) and flavanone 3-hydroxylaseF3H), among others, were involved in the regulation of drought stress responses. The results provide a reference point for further research on the drought resistance mechanism of S. collina.

Key words: arid zone plant, stress, anatomical structure, physiological property, molecular regulation