Differential assembly of polypeptides of the light-harvesting 2 complex encoded by distinct operons during acclimation of Rhodobacter sphaeroides to low light intensity

Photosynthetic microorganisms are able to modify their chemical composition, cellular structure, and organization of their chloroplasts in response to the level of irradiance. The photosynthetic apparatus adjusts itself to any new light regime by changing the ultrastructural properties of the chloroplast to provide space and area needed to match other biochemical changes in order to optimize light harvesting and utilization. Acclimation to low light intensity is characterized by an increase in thylakoid number in cyanobacteria, and in the chloroplast volume in eukaryotic plants. In the Eukaryota, these changes allow the packaging of more thylakoids within this organelle to harbor the addition of photosynthetic complexes, i.e., light harvesting antennae, reaction centers, and electron transport components. These changes are essential for optimal operation of the photosynthetic apparatus at low light intensity, mainly to increase the absorption of light energy. Acclimation to high irradiance is characterized by a reduction of the surface density of thylakoid membranes and reduction in the specific volume of the chloroplast. The accumulation of storage bodies containing starch and lipids is yet another typical feature of high light acclimated cells in response to the high rate of photosynthetic activity.

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Proteomic Analysis of the Developing Intracytoplasmic Membrane in Rhodobacter sphaeroides During Adaptation to Low Light Intensity

Recent Advances in Phototrophic Prokaryotes - Advances in Experimental Medicine and Biology ◽

10.1007/978-1-4419-1528-3_10 ◽

2010 ◽

pp. 161-178 ◽

Cited By ~ 18

Author(s):

Kamil Woronowicz ◽

Robert A. Niederman

Keyword(s):

Light Intensity ◽

Rhodobacter Sphaeroides ◽

Proteomic Analysis ◽

Intracytoplasmic Membrane ◽

Low Light ◽

Low Light Intensity

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A New Type of Light-Harvesting Complex Detected when Growing Rhodopseudomonas palustris under Low Light Intensity Conditions

Doklady Biochemistry and Biophysics ◽

10.1134/s160767292002012x ◽

2020 ◽

Vol 491 (1) ◽

pp. 101-104

Author(s):

O. P. Serdyuk ◽

L. D. Smolygina ◽

A. A. Ashikhmin

Keyword(s):

Light Intensity ◽

Light Harvesting ◽

Rhodopseudomonas Palustris ◽

Low Light ◽

Light Harvesting Complex ◽

Low Light Intensity ◽

New Type

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Response of Photosynthesis and Chlorophyll Fluorescence Parameters of Castanopsis kawakamii Seedlings to Forest Gaps

Forests ◽

10.3390/f11010021 ◽

2019 ◽

Vol 11 (1) ◽

pp. 21

Author(s):

Zhong-sheng He ◽

Rong Tang ◽

Meng-jia Li ◽

Meng-ran Jin ◽

Cong Xin ◽

...

Keyword(s):

Chlorophyll Fluorescence ◽

Light Intensity ◽

Seedling Growth ◽

Group Treatment ◽

Control Group ◽

Low Light ◽

Chlorophyll Fluorescence Parameters ◽

Forest Gaps ◽

Low Light Intensity ◽

Weak Light

Light is a major environmental factor limiting the growth and survival of plants. The heterogeneity of the light environment after gap formation in forest influences the leaf chlorophyll contents, net photosynthetic rate (Pn), and chlorophyll fluorescence, thus influencing the growth and regeneration of Castanopsis kawakamii seedlings. The aim of this study was to explore the effects of weak light on the photosynthetic physiology of C. kawakamii seedlings in forest gaps and non-gaps. The results showed that (1) the contents of chlorophyll a (Chl-a), chlorophyll b (Chl-b), and total chlorophyll (Chl-T) in forest gaps were lower than in non-gaps. Seedlings tended to increase chlorophyll content to absorb light energy to adapt to low light intensity in non-gap environments. (2) The Pn values of C. kawakamii seedlings in forest gaps were significantly higher than in non-gaps, and forest gaps could improve the seedlings’ photosynthetic capacity. (3) The C. kawakamii seedlings in forest gaps were more sensitive to weak light and control group treatment, especially the tall seedlings, indicating that seedlings require more light to satisfy their growth needs in the winter. The seedlings in non-gaps demonstrated better adaptability to low light intensity. The light intensity was not adequate in weak light conditions and limited seedling growth. We suggest that partial forest selection cutting could improve light intensity in non-gaps, thus promoting seedling growth and regeneration of C. kawakamii more effectively in this forest.

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