Supramolecular architecture of photosynthetic membrane in red algae in response to nitrogen starvation



Zhao, Long-Sheng, Su, Hai-Nan, Li, Kang, Xie, Bin-Bin, Liu, Lu-Ning ORCID: 0000-0002-8884-4819, Zhang, Xi-Ying, Chen, Xiu-Lan, Huang, Feng, Zhou, Bai-Cheng and Zhang, Yu-Zhong
(2016) Supramolecular architecture of photosynthetic membrane in red algae in response to nitrogen starvation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS, 1857 (11). pp. 1751-1758.

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Abstract

The availability of nitrogen is one of the most important determinants that can limit the growth of photosynthetic organisms including plants and algae; however, direct observations on the supramolecular architecture of photosynthetic membranes in response to nitrogen stress are still lacking. Red algae are an important evolutionary group of algae which contain phycobilisomes (PBSs) on their thylakoid membranes, as do cyanobacteria. PBSs function not only as light-harvesting antennae but also as nitrogen storage. In this report, alterations of the supramolecular architecture of thylakoid membranes from red alga Porphyridium cruentum during nitrogen starvation were characterized. The morphology of the intact thylakoid membrane was observed to be round vesicles. Thylakoid membranes were reduced in content and PBSs were degraded during nitrogen starvation. The size and density of PBSs were both found to be reduced. PBS size decreased by less than one-half after 20days of nitrogen starvation, but their hemispherical morphology was retained. The density of PBSs on thylakoid membranes was more seriously affected as time proceeded. Upon re-addition of nitrogen led to increasing of PBSs on thylakoid membranes. This work reports the first direct observation on alterations in the supramolecular architecture of thylakoid membranes from a photosynthetic organism in response to nitrogen stress.

Item Type: Article
Uncontrolled Keywords: Red algae, Phycobilisome, Nitrogen starvation, Photosynthesis, Atomic force microscopy
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2016 07:40
Last Modified: 19 Jan 2023 07:30
DOI: 10.1016/j.bbabio.2016.08.005
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3003132