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<p>In coastal areas around the world, red tides cause economic losses to aquaculture industries. Precautions, such as evacuating cages, can mitigate the damage caused by red tides, and the effectiveness of such measures is enhanced by accurate forecasting of the noxious microalgae’s growth dynamics. Here we examined the relationships between cell morphology and growth under different nutrient conditions using Japanese culture strains of a noxious raphidophyte, <i>Chattonella marina</i> complex. When a culture strain of <i>Chattonella</i> was incubated in nitrogen- or phosphorus-depleted conditions, the growth rate correlated positively with cell area, and negatively with cell roundness and dominance of abnormal cells, such as those with a clearly visible nucleus or with a needle-like tail with fewer pigments (tailed cell). Within 1–3&#xa0;days after nutrient additions, cell size recovered and abnormal cells disappeared. Moreover, we also observed similar changes of cellular morphology under a nitrogen- and phosphorus-depleted condition for the other three strains, including three varieties. These results suggest a possibility that cytomorphological parameters, such as a predominance of abnormal cells, mark the nutrient limitation in <i>Chattonella marina</i> complex.</p>

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Vegetative-cell morphology changes depending on nutritional conditions in Japanese strains of the noxious red-tide microalgae Chattonella

  • 期刊论文

  • 发表日期：

    2025年2月23日

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  • Tomoyuki Shikata,
  • Koki Yuasa,
  • Saho Kitatsuji,
  • Ryoko Yano

摘要

In coastal areas around the world, red tides cause economic losses to aquaculture industries. Precautions, such as evacuating cages, can mitigate the damage caused by red tides, and the effectiveness of such measures is enhanced by accurate forecasting of the noxious microalgae’s growth dynamics. Here we examined the relationships between cell morphology and growth under different nutrient conditions using Japanese culture strains of a noxious raphidophyte, Chattonella marina complex. When a culture strain of Chattonella was incubated in nitrogen- or phosphorus-depleted conditions, the growth rate correlated positively with cell area, and negatively with cell roundness and dominance of abnormal cells, such as those with a clearly visible nucleus or with a needle-like tail with fewer pigments (tailed cell). Within 1–3 days after nutrient additions, cell size recovered and abnormal cells disappeared. Moreover, we also observed similar changes of cellular morphology under a nitrogen- and phosphorus-depleted condition for the other three strains, including three varieties. These results suggest a possibility that cytomorphological parameters, such as a predominance of abnormal cells, mark the nutrient limitation in Chattonella marina complex.