Photosynthesis of <Emphasis Type="Italic">Rehmannia glutinosa</Emphasis> subjected to drought stress is enhanced by choline chloride through alleviating lipid peroxidation and increasing proline accumulation |
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Authors: | Huijie Zhao Jinfang Tan Chunmiao Qi |
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Institution: | (1) College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, P.R. China |
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Abstract: | Rehmannia glutinosa seedlings were pretreated with choline chloride (CC) in concentrations of 0, 0.7, 2.1 and 3.5 mM, and then subjected to drought
and rewatering treatment to study the effects of CC on the generation of reactive oxygen species (O2−, H2O2), lipid peroxidation, proline accumulation, water status and photosynthesis. The results showed that pretreatment with CC
alleviated the inhibition of SOD and APX activity caused by drought stress, and therefore, the rate of O2− production and H2O2 concentration were reduced and lipid peroxidation decreased in pretreated plants. CC pretreatment also accelerated accumulation
of proline, maintained higher Ψw and RWC, deferred leaf water loss during drought stress and retarded the drop in proline
concentration after rewatering. Consequently, drought-induced decreases in Fm/F0, Fv/Fm, ΦPS2, qP, and A and increase in qNP were inhibited and the recovery of photosynthesis after rewatering was quicker in pretreated plants. Although differences
in Fv/Fm, ΦPS2 and qP between treatments were not significant, there was a general trend that the effects of CC increased with the rise of its
concentrations. The data suggested that 2.1 mM of CC be suitable for alleviating lipid peroxidation, promoting proline accumulation,
retarding leaf water loss and improving photosynthesis of R. glutinosa seedlings under drought stress. |
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Keywords: | Antioxidative enzymes Choline chloride Drought stress Osmotic regulation Photosynthesis Rehmannia glutinosa |
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