Blue-Light Regulated Expression of Genes for Two Early Steps of Chlorophyll Biosynthesis in Chlamydomonas Reinhardtii

1995 ◽  
pp. 2845-2850
Author(s):  
Gail L. Matters ◽  
Samuel I. Beale
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Blue Light ◽  
Chlorophyll Biosynthesis ◽  
Expression Of Genes ◽  
Regulated Expression

scholarly journals LTS3 gene controls light-independent chlorophyll biosynthesis in green algae Chlamydomonas reinhardtii

2010 ◽  
Vol 8 (2) ◽  
pp. 35-44
Author(s):  
Elena M Chekunova ◽  
Natalya V Savelieva
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Positional Cloning ◽  
Chlorophyll Biosynthesis ◽  
Plant Cells ◽  
Expression Of Genes ◽  
Gata Transcription Factor ◽  
Pigment Contents ◽  
Genes Encoding ◽  
Activity Of Enzymes ◽  
Mg Chelatase

The genetic control of light-independent chlorophyll biosynthesis in plant cells has been investigated using Chlamydomonas reinhardtii Lts3-mutants defective in dark chlorophyll biosynthesis on the stage before protochlorophyllide to chlorophyllide conversion. In heterotrophic conditions the mutants are unable to synthesize chlorophyll and accumulate protoporphyrins, after illumination they are greening. The mutants were tested for pigment contents, activity of enzymes and expression of the genes, encoding these enzymes. The LTS3 gene has been identified by positional cloning, and the predicted LTS3 protein appeared to be a GATA transcription factor, which activate the expression of genes encoded chlorophyll biosynthesis enzymes: Mg-chelatase and glutamate 1-semialdehyde aminotransferase in the dark, and possibly, important for adaptation of plant cells for autotrophic conditions. 

scholarly journals A Simple and Low-Cost Strategy to Improve Conidial Yield and Stress Resistance of Trichoderma guizhouense through Optimizing Illumination Conditions

2022 ◽  
Vol 8 (1) ◽  
pp. 50
Author(s):  
Yifan Li ◽  
Xiya Meng ◽  
Degang Guo ◽  
Jia Gao ◽  
Qiwei Huang ◽  
...  
Keyword(s):  
Blue Light ◽  
Stress Responses ◽  
Stress Resistance ◽  
Low Cost ◽  
Hog Pathway ◽  
Precise Control ◽  
Blue Light Receptor ◽  
Expression Of Genes ◽  
Low Cost Strategy ◽  
Stress Related Genes

Light is perceived by photoreceptors in fungi and further integrated into the stress-activated MAPK HOG pathway, and thereby potentially activates the expression of genes for stress responses. This indicates that the precise control of light conditions can likely improve the conidial yield and stress resistance to guarantee the low cost and long shelf life of Trichoderma-based biocontrol agents and biofertilizers. In this study, effects of wavelengths and intensities of light on conidial yield and stress tolerance to osmotic, oxidative and pH stresses in Trichoderma guizhouense were investigated. We found that 2 μmol photons/(m2 × s) of blue light increased the conidial yield more than 1000 folds as compared to dark condition and simultaneously enhanced conidial stress resistance. The enhanced conidial stress resistance is probably due to the upregulated stress-related genes in blue light, which is under the control of the blue light receptor BLR1 and the MAP kinase HOG1.

scholarly journals The function of PROTOPORPHYRINOGEN IX OXIDASE in chlorophyll biosynthesis requires oxidised plastoquinone in Chlamydomonas reinhardtii

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Pawel Brzezowski ◽  
Brigitte Ksas ◽  
Michel Havaux ◽  
Bernhard Grimm ◽  
Marie Chazaux ◽  
...  
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Chlorophyll Biosynthesis

A short overview of chlorophyll biosynthesis in algae

Biologia ◽  
2008 ◽  
Vol 63 (6) ◽  
Author(s):  
Eliška Gálová ◽  
Iveta Šalgovičová ◽  
Viktor Demko ◽  
Katarína Mikulová ◽  
Andrea Ševčovičová ◽  
...  
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Metabolic Activity ◽  
Chlorophyll Biosynthesis ◽  
Enzymatic Reaction ◽  
Continuous Light ◽  
Present Knowledge ◽  
The Other ◽  
Natural Pigments ◽  
Short Overview

AbstractChlorophylls are the most abundant classes of natural pigments and their biosynthesis is therefore a major metabolic activity in the ecosphere. Two pathways exist for chlorophyll biosynthesis, one taking place in darkness and the other requiring continuous light as a precondition. The key process for Chl synthesis is the reduction of protochlorophyllide (Pchlide). This enzymatic reaction is catalysed by two different enzymes — DPOR (dark-operative Pchlide oxidoreductase) or the structurally distinct LPOR (light-dependent Pchlide oxidoreductase). DPOR which consists of three subunits encoded by three plastid genes in eukaryotes was subject of our study. A short overview of our present knowledge of chlorophyll biosynthesis in Chlamydomonas reinhardtii in comparison with other plants is presented.

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