The influence of antimycin A on pigment composition and functional activity of photosynthetic apparatus in Triticum aestivum L. under high temperature
Autor: | Anna Batjuka, Nataļja Škute, Aleksandrs Petjukevičs |
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Rok vydání: | 2017 |
Předmět: |
0106 biological sciences
0301 basic medicine Chlorophyll a Physiology Chemistry food and beverages Plant physiology Plant Science Antimycin A Photosynthetic pigment Photochemistry Photosynthesis 01 natural sciences Acclimatization 03 medical and health sciences chemistry.chemical_compound Horticulture Pigment 030104 developmental biology Chlorophyll visual_art visual_art.visual_art_medium 010606 plant biology & botany |
Zdroj: | Photosynthetica. 55:251-263 |
ISSN: | 1573-9058 0300-3604 |
DOI: | 10.1007/s11099-016-0231-9 |
Popis: | The purpose of the current investigation was to evaluate the influence of antimycin A (AA) as an activator of the alternative respiratory pathway (AP) on photosynthetic pigment composition and functional activity of the photosynthetic apparatus of wheat seedlings (Triticum aestivum L.) under exposure to high temperature as well as their acclimation. Our results indicated that a significant decrease (44–74%) of photosynthetic pigment contents was caused by a long-term exposure to high temperature (42°C), while the short-term exposure resulted in 20–46% decline. However, a combined effect of AA and long-term high temperature reduced the total pigment contents by 28–41%. Our results demonstrated that the reduction of the chlorophyll a/b ratio was less significant under the combined effect of AA and high temperature than that under the stressful condition without AA. We observed that short-term and long-term high temperature modified PSII functionality of the first leaves in wheat seedlings, which was manifested by the low maximal quantum yield of PSII photochemistry, maximum fluorescence yield in the dark-adapted state, and by high minimum fluorescence yield in the dark-adapted state. The quantum yield of PSII photochemistry decreased rapidly by 16–24% under the combination of AA and high temperature. Overall, these results suggest that the activation of the alternative pathway, induced by AA, contributed to the stabilization of the photosynthetic apparatus in wheat seedlings under high temperature. |
Databáze: | OpenAIRE |
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