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CAT and MDH improve the germination and alleviate the oxidative stress of cryopreserved Paeonia and Magnolia pollen

100%

Jia M. X. , Jiang X. R. , Xu J. , Di W. , Shi Y. , Liu Y.

Acta Physiologiae Plantarum

2018

tom 40

nr 02

Researches have reported that reactive oxygen species (ROS)-induced oxidative stress plays an important role in cell cryodamage during cryopreservation. In the current study, pollen from Magnolia denudata and Paeonia lactiflora ‘Zi Feng Chao Yang’ was cryopreserved and incubated with exogenous catalase (CAT) and malate dehydrogenase (MDH) immediately after thawing. The effect of CAT and MDH on the germination of cryopreserved pollen was measured. Based on that, the ROS level, lipid peroxidation and antioxidants activities in fresh pollen, cryopreserved pollen added with or without CAT or MDH were determined to investigate their relationship with oxidative stress. Pollen from Magnolia and Paeonia showed a significant loss of germination, but marked increase of ROS and malondialdehyde (MDA) production after cryostorage. Antioxidant profiles in them were also enhanced. CAT and MDH addition increased the post-LN pollen germination of Magnolia and Paeonia significantly. Their germination rate achieved the highest with 100 IU ml⁻¹ MDH and 400 IU ml⁻¹ CAT application, respectively. Compared to their untreated controls, ROS and MDA accumulation reduced significantly in cryopreserved Magnolia pollen treated with 100 IU ml⁻¹ MDH, while superoxide dismutase (SOD) activity improved markedly. In the case of Paeonia, significantly lower level of ROS and MDA, but higher activity of CAT and SOD were observed in cryopreserved pollen treated with 400 IU ml⁻¹ CAT. In conclusion, pollen deterioration after cryopreservation is associated with ROS-induced oxidative stress. Exogenous CAT and MDH can reduce the oxidative damage through the activity stimulation of antioxidant enzymes, and play a protective role in the pollen during cryopreservation.

Effect of an essential oils blend on growth performance, and selected parameters of oxidative stress and antioxidant defence of Escherichia coli challenged piglets

100%

Jiang X. R. , Li X. L. , Awati A. , Bento H. , Zhang H. J. , Bontempo V.

tom 26

nr 1

This study evaluated the effect of diet supplementation with an essential oil blend (13.5% thymol and 4.5% cinnamaldehyde, EO) on growth performance and selected parameters of oxidative stress and antioxidant defence in Escherichia coli challenged piglets. Ninety-six weaned piglets were allocated into 4 experimental treatments (6 replicates per treatment with 4 piglets per replicate) for 35 days arranged in a 2×2 factorial design: diet [a basal diet without additive (CT) or with 50 mg · kg−1 EO] and E. coli challenge [sham (−) or infected (+)]. On day 8, half of the piglets from each dietary group was orally inoculated with 4 ml of E. coli O149:F4 (K88). The E. coli challenge increased the level of malondialdehyde (MDA) in piglet serum on day 9 (P < 0.01), and tended to reduce average daily feed intake (P = 0.08) and average daily gain (P = 0.08) from day 7 to day 35. Dietary EO addition did not affect growth performance but tended to reduce MDA content in piglet serum in comparison with CT group on day 9 (P = 0.07). Neither EO addition nor E. coli challenge influenced antioxidative enzymes (superoxide dismutase and glutathione peroxidase) activity. The obtained results suggest that EO rich in thymol and cinnamaldehyde had tendency to reduce serum lipid peroxidation level by EO addition, however no such effect was observed in piglets challenged by E. coli. So, further studies are needed to confirm the EO influence on systemic antioxidant defence of weaned piglets.