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<p>Turfgrasses growing on tropical island reefs have developed morphological, structural, physiological and ecological strategies that confer them with tolerance to salt, high temperatures and drought. They are thus able to adaptively survive in extreme environments with high salt concentrations, high temperatures, strongly alkaline soil, and high light intensities. Research on tropical island turfgrasses advance knowledge on island ecological restoration, salt tolerance, and resource development. This study focused on five turfgrass species that are used as lawn turfgrass in southern China: <i>Lepturus repens</i> (G. Forst.) R. Br., <i>Thuarea involuta</i> (Forst.) R. Br, <i>Zoysia matrella</i> (L.) Merr, <i>Cynodon dactylon</i> (L.) Persoon and <i>Axonopus compressus</i> (Sw.) P. Beauv. For all species, using an in vitro tissue culture system based on Murashige and Skoog (MS) basal medium for shoot proliferation and growth, the physiological responses to different NaCl concentrations were assessed, and NaCl tolerance was evaluated. Based on physiological or biochemical parameters, salt tolerance of the species was <i>A. compressus</i> (0.06) &gt; <i>Z. matrella</i> (0.09) &gt; <i>C. dactylon</i> (0.14) &gt; <i>L. repens</i> (0.42) &gt; <i>T. involuta</i> (0.67) at 50 mM NaCl; <i>Z. matrella</i> (0.04) &gt; <i>A. compressus</i> (0.25) &gt; <i>C. dactylon</i> (0.35) &gt; <i>L. repens</i> (0.46) &gt; <i>T. involuta</i> (0.67) at 100 mM; <i>C. dactylon</i> (0.30) &gt; <i>L. repens</i> (0.37) &gt; <i>A. compressus</i> (0.48) &gt; <i>Z. matrella</i> (0.60) &gt; <i>T. involuta</i> (0.95) at 200 mM NaCl; <i>C. dactylon</i> (0.33) &gt; <i>L. repens</i> (0.46) &gt; <i>Z. matrella</i> (0.72) &gt; <i>A. compressus</i> (0.83) = <i>T. involuta</i> (0.83) at 400 mM NaCl The correlation between physiological and biochemical parameters of these five turfgrasses was also assessed, with a strong correlation with MDA content in <i>T. involuta</i>, with proline content and POD, SOD activity in <i>L. repens</i> and <i>Z. matrella</i>, with proline content and CAT, SOD activity in <i>C. dactylon</i>, and with proline content and POD activity in <i>A. compressus</i>, suggesting their different roles in the protective mechanism underlying different concentrations of salt stress tolerance.</p>

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In vitro physiological and biochemical responses underlying salt tolerance of five turfgrass species

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Zhen-Peng Wei,
  • Yu-Ping Xiong,
  • Jaime A. Teixeira da Silva,
  • Jian-Rong Li,
  • Jun-Yu Liu,
  • Yuan Li,
  • Zhan Bian,
  • Xin-Hua Zhang,
  • Guo-Hua Ma

摘要

Turfgrasses growing on tropical island reefs have developed morphological, structural, physiological and ecological strategies that confer them with tolerance to salt, high temperatures and drought. They are thus able to adaptively survive in extreme environments with high salt concentrations, high temperatures, strongly alkaline soil, and high light intensities. Research on tropical island turfgrasses advance knowledge on island ecological restoration, salt tolerance, and resource development. This study focused on five turfgrass species that are used as lawn turfgrass in southern China: Lepturus repens (G. Forst.) R. Br., Thuarea involuta (Forst.) R. Br, Zoysia matrella (L.) Merr, Cynodon dactylon (L.) Persoon and Axonopus compressus (Sw.) P. Beauv. For all species, using an in vitro tissue culture system based on Murashige and Skoog (MS) basal medium for shoot proliferation and growth, the physiological responses to different NaCl concentrations were assessed, and NaCl tolerance was evaluated. Based on physiological or biochemical parameters, salt tolerance of the species was A. compressus (0.06) > Z. matrella (0.09) > C. dactylon (0.14) > L. repens (0.42) > T. involuta (0.67) at 50 mM NaCl; Z. matrella (0.04) > A. compressus (0.25) > C. dactylon (0.35) > L. repens (0.46) > T. involuta (0.67) at 100 mM; C. dactylon (0.30) > L. repens (0.37) > A. compressus (0.48) > Z. matrella (0.60) > T. involuta (0.95) at 200 mM NaCl; C. dactylon (0.33) > L. repens (0.46) > Z. matrella (0.72) > A. compressus (0.83) = T. involuta (0.83) at 400 mM NaCl The correlation between physiological and biochemical parameters of these five turfgrasses was also assessed, with a strong correlation with MDA content in T. involuta, with proline content and POD, SOD activity in L. repens and Z. matrella, with proline content and CAT, SOD activity in C. dactylon, and with proline content and POD activity in A. compressus, suggesting their different roles in the protective mechanism underlying different concentrations of salt stress tolerance.