Effects of endogenous ascorbic acid on resistance to high-temperature stress in excised rice leaves

Ascorbic acid (Asc) is a major plant antioxidant. L-galactono-1,4-lactone dehydrogenase (GLDH) is an enzyme that catalyzes the last step of Asc biosynthesis in higher plants. Effects of endogenous Asc on resistance to high-temperature stress were studied by using GLDH-overexpressed (GO-2) and GLDH-s...

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Bibliographic Details
Published in:Photosynthetica 2018-12, Vol.56 (4), p.1453-1458
Main Authors: Zhang, Q.L., Wei, Y.X., Peng, C.L.
Format: Article
Language:English
Subjects:
Acid resistance
Antioxidants
Ascorbic acid
Biomedical and Life Sciences
Biosynthesis
Brief Communication
Chlorophyll
Leaves
Life Sciences
Lipid peroxidation
Peroxidation
Photosystem II
Plant Physiology
Plants (botany)
Proteins
Reactive oxygen species
Ribulose-bisphosphate carboxylase
Rice
Stress
Stresses
Temperature effects
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Summary:Ascorbic acid (Asc) is a major plant antioxidant. L-galactono-1,4-lactone dehydrogenase (GLDH) is an enzyme that catalyzes the last step of Asc biosynthesis in higher plants. Effects of endogenous Asc on resistance to high-temperature stress were studied by using GLDH-overexpressed (GO-2) and GLDH-suppressed transgenic rice (GI-2) as experimental materials. After high-temperature treatment, the maximal quantum yield of PSII was significantly lower in GI-2, and higher in GO-2 compared to wild type rice. The content of reactive oxygen species (ROS) was the highest in GI-2. The higher Asc content resulted in lower lipid peroxidation in GO-2. The contents of chlorophyll, soluble proteins, and Rubisco large and small subunit were positively correlated to the Asc content. These results show that the higher Asc content reduced the accumulation of ROS and maintained the function of rice leaves. We suggest that the higher Asc content could improve the rice resistance to high-temperature stress.
ISSN:0300-3604
1573-9058
DOI:10.1007/s11099-018-0836-2