Analysis of daily dynamics of thermal interaction of temperature and ocean flow in seaweed growth areas

Tulandi, Djeli Alvi; Tumangkeng, Jeane

doi:10.1088/1742-6596/1968/1/012035

Cited by 1 publication

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“…N. yezoensis has diploid and haploid stages in its life cycle [6]; the haploid gametophyte blades (thalli) are the edible laver blades planted on the aquaculture raft whose growth is affected by various ecological factors, such as temperature, salinity, and pH values [7,8]. Particularly, in recent years, rising seawater temperatures due to global warming [9] have put pressure on the cultivation of Neopyropia [10,11]. The differences in color and yield of N. yezoensis harvested at different periods are mainly impacted by temperature.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Mechanisms of Growth and Physiological Changes in Response to Different Temperatures in Neopyropia yezoensis (Rhodophyta)

Yin

Che³

et al. 2022

Water

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As an economically valuable red seaweed, Neopyropia yezoensis (Rhodophyta) is cultivated in intertidal areas, and its growth and development are greatly influenced by environmental factors such as temperature. Although much effort has been devoted to delineating the influence, the underlying cellular and molecular mechanisms remain elusive. In this study, the gametophyte blades and protoplasts were cultured at different temperatures (13 °C, 17 °C, 21 °C, 25 °C). Only blades cultured at 13 °C maintained a normal growth state (the relative growth rate of thalli was positive, and the content of phycobiliprotein and pigments changed little); the survival and division rates of protoplasts were high at 13 °C, but greatly decreased with the increase in temperature, suggesting that 13 °C is suitable for the growth of N. yezoensis. In our efforts to delineate the underlying mechanism, a partial coding sequence (CDS) of Cyclin B and the complete CDS of cyclin-dependent-kinase B (CDKB) in N. yezoensis were cloned. Since Cyclin B controls G2/M phase transition by activating CDK and regulates the progression of cell division, we then analyzed how Cyclin B expression in the gametophyte blades might change with temperatures by qPCR and Western blotting. The results showed that the expression of Cyclin B first increased and then decreased after transfer from 13 °C to higher temperatures, and the downregulation of Cyclin B was more obvious with the increase in temperature. The phosphorylation of extracellular signal-regulated kinase (ERK) decreased with the increase in temperature, suggesting inactivation of ERK at higher temperatures; inhibition of ERK by FR180204 significantly decreased the survival and division rates of protoplasts cultured at 13 °C. These results suggest that downregulation of Cyclin B and inactivation of ERK might be involved in negatively regulating the survival and division of protoplasts and the growth of gametophyte blades of N. yezoensis at high temperatures.

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