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<p>The floating cultivation of <i>Pyropia</i> in shallow seas requires seaweed with enhanced wave resistance and desiccation tolerance. A new strain, <i>ZD-2</i>, was developed from the <i>ZD-1</i> variety through mutagenesis to address these needs. The blade growth, the attachment force of the holdfast, the desiccation rate, levels of photosynthetic pigments, free amino acids and nucleotides were analyzed under laboratory and field conditions. Between 31–40&#xa0;days, <i>ZD-2</i> exhibited rapid growth, with a higher rate of increase in blade width compared to <i>ZD-1</i>. After 55&#xa0;days of growth, <i>ZD-2</i> showed a 25% increase in blade width and a 22% increase in average fresh weight compared to <i>ZD-1</i>. Floating cultivation further confirmed <i>ZD-2</i>'s advantages in growth rate and blade width. <i>ZD-2</i> released conchospores, primarily on the second day, in higher quantities and with subsequent higher growth rates than <i>ZD-1</i>. <i>ZD-2</i> developed robust holdfasts with greater attachment force to net ropes compared to <i>ZD-1</i> and a local cultivar. Moreover, when simulating desiccation-rehydration processes, <i>ZD-2</i> demonstrated more rapid desiccation and recovery upon rehydration. The chlorophyll <i>a</i> and total phycobiliprotein contents of <i>ZD-2</i> blades were 4.30% and 13.67% higher than those in <i>ZD-1</i>, respectively. Additionally, <i>ZD-2</i> contained significantly higher levels of the umami amino acid Glu and the umami nucleotides IMP and GMP compared to <i>ZD-1</i>. In summary, the new <i>P. haitanensis</i> strain <i>ZD-2</i> demonstrates improvements in blade growth, quality, and conchospore release. Its robust holdfasts and efficient desiccation-rehydration ability, making it a promising candidate for floating cultivation and commercial farming.</p>

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A promising mutant strain of Pyropia haitanensis ZD-2 for floating cultivation with enhanced growth, holdfast strength, and desiccation tolerance

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • Yujie Wang,
  • Qijun Luo,
  • Juanjuan Chen,
  • Rui Yang,
  • Peng Zhang,
  • Tiegan Wang,
  • Haimin Chen

摘要

The floating cultivation of Pyropia in shallow seas requires seaweed with enhanced wave resistance and desiccation tolerance. A new strain, ZD-2, was developed from the ZD-1 variety through mutagenesis to address these needs. The blade growth, the attachment force of the holdfast, the desiccation rate, levels of photosynthetic pigments, free amino acids and nucleotides were analyzed under laboratory and field conditions. Between 31–40 days, ZD-2 exhibited rapid growth, with a higher rate of increase in blade width compared to ZD-1. After 55 days of growth, ZD-2 showed a 25% increase in blade width and a 22% increase in average fresh weight compared to ZD-1. Floating cultivation further confirmed ZD-2's advantages in growth rate and blade width. ZD-2 released conchospores, primarily on the second day, in higher quantities and with subsequent higher growth rates than ZD-1. ZD-2 developed robust holdfasts with greater attachment force to net ropes compared to ZD-1 and a local cultivar. Moreover, when simulating desiccation-rehydration processes, ZD-2 demonstrated more rapid desiccation and recovery upon rehydration. The chlorophyll a and total phycobiliprotein contents of ZD-2 blades were 4.30% and 13.67% higher than those in ZD-1, respectively. Additionally, ZD-2 contained significantly higher levels of the umami amino acid Glu and the umami nucleotides IMP and GMP compared to ZD-1. In summary, the new P. haitanensis strain ZD-2 demonstrates improvements in blade growth, quality, and conchospore release. Its robust holdfasts and efficient desiccation-rehydration ability, making it a promising candidate for floating cultivation and commercial farming.