We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Physiological responses of Gracilaria lemaneiformis to copper stress.
- Authors
Zhu Xi-feng; Zou Ding-hui; Jian Jian-bo; Chen Wei-zhou; Liu Hui-hui; Du Hong
- Abstract
Gracilaria lemaneiformis was exposed to 0, 25, 50, 100, 250 and 500 μg∙L-1 of Cu2+ to study its physiological responses to Cu2+ stress. When the Cu2+ concentration was =50 μg∙L-1, the relative growth rate (RGR) of G. lemaneiformis decreased significantly, and the optimal quantum yield (Fv/Fm), the maximum relative electron transfer rate (rETRmax), and the relative electron transfer efficiency (a) exhibited the same variation trend, compared with the control. With the increase of Cu2+ concentration, the maximum net photosynthetic rate (Pmax) and light saturation point (LSP) decreased significantly, light compensation point (LCP) had a significant increase, while chlorophyll a, carotenoid, and phycobiliprotein contents decreased after an initial increase. When the Cu2+ concentration reached 500 μg∙L-1, the chlorophyll a, carotenoid, and phycobiliprotein contents decreased significantly. It was suggested that G. leman eiformis could tolerate low concentration Cu2+ stress, but its physiological activities were inhibited markedly when exposed to =50 μg∙L-1 of Cu2+.
- Subjects
RED algae; GRACILARIA; PHYSIOLOGICAL effects of copper; BIOTIC communities; CHARGE exchange; PHOTOSYNTHESIS; CHLOROPHYLL; CAROTENOIDS; PHYCOBILIPROTEINS
- Publication
Yingyong Shengtai Xuebao, 2009, Vol 20, Issue 6, p1438
- ISSN
1001-9332
- Publication type
Article