Galactolipase activity but not the level of high-melting-point phosphatidylglycerol is related to chilling tolerance in differentially sensitive Zea mays inbred lines
| Autor: | Z. Kaniuga, V. Sa˛czyn′ska, E. Mis′kiewicz |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Phosphatidylglycerol fungi Environmental factor food and beverages Plant Science General Medicine Biology medicine.disease_cause Chloroplast Horticulture chemistry.chemical_compound Enzyme Biochemistry chemistry Inbred strain Galactolipase parasitic diseases medicine lipids (amino acids peptides and proteins) Poaceae Agronomy and Crop Science Galactolipase activity |
| Zdroj: | Plant cell reports. 17(11) |
| ISSN: | 1432-203X |
| Popis: | Galactolipase activity, the level of high-melting-point phosphatidylglycerol (HMP-PG) as well as degradation of lipids during chilling and rewarming were studied in seedlings of maize inbred lines with different chilling responses. In aged chloroplasts of chilling-sensitive (CS) lines, galactolipase activity was considerably higher than that determined in aged chloroplasts isolated from chilling-tolerant (CT) ones. Chilling of seedlings at 5 °C for 6 days induced neither loss of chlorophyll content nor visible changes in the leaves, while a slight decline in total acyl lipid content by about 15.5% and 12.5% in CS and CT lines, respectively, was observed. Among total acyl lipids, only monogalactosyldiacylglycerol (MGDG) levels were decreased significantly upon chilling. Following return to the original growth conditions for 4 days, visible chilling injury in seedlings as well as essential differences in the decrease in total acyl lipids by about 53% and 20% in CS and CT lines, respectively, were found. These changes were accompanied by more extensive degradation of MGDG, digalactosyldiacylglycerol and phosphatidylglycerol in CS than in CT lines. As the levels of HMP-PG in fresh leaves were the same in all four lines of maize, it seems that galactolipase activity and not the level of HMP-PG is related to chilling response in maize. |
| Databáze: | OpenAIRE |
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