Physiological and biochemical responses to light and temperature stress in free-living conchocelis of Neopyropia katadae (Bangiales, Rhodophyta)

文献类型： 外文期刊

第一作者： Liang, Zhourui

作者： Liang, Zhourui;Liu, Fuli;Wang, Wenjun;Zhang, Pengyan;Yuan, Yanmin;Liu, Yi;Yao, Haiqin;Jia, Rujie;Sun, Xiutao;Wang, Feijiu;Liang, Zhourui;Liu, Fuli;Wang, Wenjun;Zhang, Pengyan;Sun, Xiutao;Liu, Yi;Jia, Rujie

作者机构：

关键词： Neopyropia katadae; Rhodophyta; Free-living conchocelis; Growth; Photosynthetic performance; Biochemical characteristics

期刊名称：JOURNAL OF APPLIED PHYCOLOGY （ 影响因子：3.404； 五年影响因子：3.834 ）

ISSN： 0921-8971

年卷期： 2022 年 34 卷 2 期

页码：

收录情况： SCI

摘要： Neopyropia katadae is one of the important economic seaweeds in China. A mass of free-living conchocelis is needed in the commercial cultivation of N. katadae. This study aimed to clarify the optimum growth conditions of the free-living conchocelis of N. katadae and its photosynthetic and biochemical response to different temperatures and irradiances, so as to provide the theoretical basis for the formulation of cultivation strategy of free-living conchocelis. The free-living conchocelis exhibited higher growth rate (RGR), net photosynthetic rates (PN), maximum relative electron transport rates (rETR(max)), and maximal photochemical efficiency of PS II (F-v/F-m) at 16-20 degrees C and 60-80 mu mol photons m(-2) s(-1). Light saturation point of the free-living conchocelis is 60.3-85.2 mu mol photons m(-2) s(-1), and low light compensation point is 6.1-13.7 mu mol photons m(-2) s(-1) in the range of 16-25 degrees C. The greatly reduced values of RGR, PN, F-v/F-m, rETR(max), Y(II), and E-k (minimum saturating irradiance) indicated that damage to the photosynthetic apparatus and photoinhibition occurred in the free-living conchocelis of N. katadae under high temperature of 23-25 degrees C and high light intensity (100-200 mu mol photons m(-2) s(-1)). High values of F-v/F-m and alpha (initial slope of the RLC) were both observed at low light intensities (10-80 mu mol photons m(-2) s(-1)), suggesting that this conchocelis is low light adapted. The content of glutathione, proline, peroxidase, ascorbate peroxidase (APX), and abscisic acid (ABA) all presented at high levels at 10 mu mol photons m(-2) s(-1), indicating that these compounds probably play an important role under low light stress in the free-living conchocelis. High temperature (24 degrees C) and high light intensities (100-150 mu mol photons m(-2) s(-1)) both led to reactive oxygen species accumulation. Compared to the control, the activities of antioxidant enzymes (superoxide dismutase, catalase, and glutathione reductase) were substantially enhanced at 24 degrees C and 100 mu mol photons m(-2) s(-1), and ascorbic acid content in 24 degrees C group was relatively higher, suggesting that these compounds probably play a crucial role in defensive reactions against high-temperature-induced or high light-induced oxidative stress in the conchocelis. Based on these results, it was proposed that the optimal cultivation conditions for free-living conchocelis of N. katadae were at 16-20 degrees C and 60-80 mu mol photons m(-2) s(-1).

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