Effects of temperature and nitrogen nutrient on the growth and photophysiology of Gracilariopsis lemaneiformis

doi:10.14088/j.cnki.issn0439-8114.2023.12.018

Abstract

Abstract: The cultivated Gracilariopsis lemaneiformis was used as the experimental material, and two temperature levels（LT：20 ℃;HT：24 ℃） and three nitrogen nutrient concentrations（LN：3.1 μmol/L;MN：30.1 μmol/L;HN：103.1 μmol/L） were set to study the effects of temperature and nitrogen nutrient concentration changes on the growth and photophysiology of G. lemaneiformis. The results showed that temperature, nitrogen nutrient and their interaction had significant effects on the relative growth rate （RGR） of G. lemaneiformis （P<0.05）. The RGR increased with the temperature and nitrogen nutrient concentration increment separately. Further fluorescence parameters showed that the effective photosynthetic quantum yield [Y（II）] of HT treatment fluctuated in the range of 0.18~0.24, which was higher than that of LT treatment under the same nitrogen nutrient concentration and HN promoted the improvement of its Y（II）under the same temperature. Temperature had a significant effect on the maximum relative electron transfer rate （rETR_max, P<0.05）, nitrogen nutrient had a significant effect on the rETR_max, light utilization efficiency （α） and saturation irradiance （I_k）（P<0.05）and their interaction had a significant effect on the α （P<0.05）. Furthermore, temperature, nitrogen nutrient and their interaction had significant effects on the photosynthetic pigments contents of G. lemaneiformis （P<0.05）. Nitrogen and the interaction had significant effects on the SP content（P<0.05）. Under LT or HT, the contents of chlorophyll a （Chl a）, carotenoids （Car）, and SP increased evidently with the increase of nitrogen nutrient concentration （P<0.05）. Our findings suggested that HN and HT significantly promoted the growth of G. lemaneiformis, which provided the theoretical data for the cultivation of G. lemaneiformis in response to environmental changes in the thermal discharge area of Tianwan Nuclear Power Station.

Key words: Gracilariopsis lemaneiformis, temperature, nitrogen nutrient, growth, photophysiology

CLC Number:

CHEN Ze-yu, DING Yu-hao, WANG Jing-wen, NI Jia-xuan, HE Hao-lin, XU Jia-tao, JIANG Shu-ying, WANG Jin-guo. Effects of temperature and nitrogen nutrient on the growth and photophysiology of Gracilariopsis lemaneiformis[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(12): 94-101.

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