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Sporophytic photosynthesis and gametophytic growth of the kelp Ecklonia stolonifera affected by ocean acidification and warming
Author(s) -
Gao Xu,
Choi Han Gil,
Park Seo Kyoung,
Kim Ju Hyoung,
Yu Ok Hwan,
Nam Ki Wan
Publication year - 2019
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13957
Subject(s) - sporophyte , gametophyte , biology , botany , photosynthesis , kelp , effects of global warming on oceans , algae , ecology , global warming , climate change , pollen
Juvenile sporophytes and gametophytes of Ecklonia stolonifera were incubated in combinations of three pCO 2 levels (360, 720 and 980 ppmv) and two temperatures (10 and 15°C for sporophytes; 15 and 20°C for gametophytes) to examine potential effects of climate change on photosynthesis and growth. Sporophytes had significantly higher maximum quantum yields (F v /F m ) and maximum relative electron transport rates (rETR max ) at 720 ppmv than 360 and 980 ppmv. Also, these parameters were significantly lower at higher temperature of 15°C than at 10°C. Growth of female gametophytes was maximal at 360 ppmv rather than enriched pCO 2 levels. Female gametophytes had significantly lower growth at higher temperature of 20°C than at 15°C. These results indicate effects of elevated pCO 2 varied between generations: stimulating sporophytic photosynthesis and inhibiting gametophytic growth. Ocean acidification and warming would constitute a grave threat to seedling cultivation of E. stolonifera caused by growth inhibition of gametophytes at high pCO 2 levels and temperatures.