Photosynthetica 2000, 38(1):29-35 | DOI: 10.1023/A:1026735605804

Analysis of Some Barley Chlorophyll Mutants and Their Response to Temperature Stress

E. Gálová1, B. Böhmová1, A. Ševčovičová1
1 Department of Genetics, Faculty of Natural Sciences, Comenius University, Bratislava, Slovak Republic

Six barley chlorophyll (Chl) mutants, viridis, flavoviridis, chlorina, xanhta, lutea, and albina, differed in the contents of Chl (a+b) and carotenoids (Cars). In accordance with their Chl-deficient phenotype, the Chl a and b and Car contents of mutants decreased from viridis to albina, only xantha had the same or even higher concentration of Cars as the wild type plant. The albina mutant completely lacked and xantha had a significantly reduced photosynthetic activity. We found quantitative differences in protein contents between wild type and mutant plants, with the lowest concentration per fresh mass in the albina mutant. Chl fluorescence analysis revealed that heat-treated barley leaves of both the wild type and Chl mutants had a lower photosystem 2 efficiency than the untreated ones. With 35S-methionine labelling and SDS-PAGE we found that six to nine de novo synthetized proteins appeared after heat shock (2 h, 42 °C) in the wild type and Chl mutants. In albina the expression of heat shock proteins (HSPs) was reduced to 50 % of that in the wild type. Hence mainly albina mutants, with a completely destroyed proteosynthetic apparatus of the chloroplasts, are able to synthesize a small set of HSPs. The albina mutant is a very useful tool for the study of different gene expression of chloroplast and nuclear DNA.

Additional key words: fluorescence; heat-shock proteins; Hordeum vulgare; proteins; RNA; SDS-PAGE

Prepublished online: October 1, 2000; Published: April 1, 2000  Show citation

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Gálová, E., Böhmová, B., & Ševčovičová, A. (2000). Analysis of Some Barley Chlorophyll Mutants and Their Response to Temperature Stress. Photosynthetica, 38(1), 29-35. doi: 10.1023/A:1026735605804
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