Exogenous spermidine enhances the photosynthesis and ultrastructure of lettuce seedlings under high-temperature stress

2022 ◽  
Vol 291 ◽  
pp. 110570
Author(s):  
Xiaoyu Yang ◽  
Yingyan Han ◽  
Jinghong Hao ◽  
Xiaoxiao Qin ◽  
Chaojie Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
High Temperature Stress ◽  
Exogenous Spermidine

scholarly journals Exogenous Spermidine Alleviates the Oxidative Damage in Cucumber Seedlings Subjected to High Temperatures

2012 ◽  
Vol 137 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Jing Tian ◽  
Li-Ping Wang ◽  
Yan-Juan Yang ◽  
Jin Sun ◽  
Shi-Rong Guo
Keyword(s):  
High Temperature ◽  
Oxidative Damage ◽  
Temperature Stress ◽  
Heat Tolerance ◽  
Antioxidant Activities ◽  
Foliar Spray ◽  
High Temperature Stress ◽  
Antioxidant Ability ◽  
Cucumber Seedlings ◽  
Exogenous Spermidine

Heat tolerance is considered to be an essential feature for cucumber (Cucumis sativus) production, and it has been suggested that higher antioxidant ability could prevent the oxidative damage in plants caused by high-temperature stress. We aimed to investigate whether the application of exogenous spermidine (Spd) increases antioxidant activities and, therefore, elevates the heat tolerance of cucumber. Cucumber seedlings (cv. Jinchun No. 4) showing moderate heat tolerance were grown in climate chambers to investigate the effects of exogenous Spd (1 mm) foliar spray treatment on the activities and isozyme levels of antioxidative enzymes under both high-temperature stress 42/32 °C (day/night) and normal temperature 28/18 °C (day/night). On high-temperature stress, the activities of superoxide dismutase and ascorbate peroxidase were significantly reduced; the catalase activity was initially lower and then increased, whereas the peroxidase activity was initially higher and then decreased. The levels of these isozymes also changed differently. On treatment with exogenous Spd, the activities of these antioxidant enzymes were noticeably enhanced, and the isozyme zymogram expression had some changes. It was concluded that foliar spray with Spd effectively improved the total antioxidant ability of cucumber seedlings and, therefore, enhanced the tolerance of the plants to high-temperature stress.

scholarly journals Effects of Exogenous Spermidine on Carbon and Nitrogen Metabolism in Tomato Seedlings under High Temperature

2016 ◽  
Vol 141 (4) ◽  
pp. 381-388 ◽  
Author(s):  
Xi Shan ◽  
Heng Zhou ◽  
Ting Sang ◽  
Sheng Shu ◽  
Jin Sun ◽  
...  
Keyword(s):  
High Temperature ◽  
Plant Growth ◽  
Temperature Stress ◽  
Glutamate Synthase ◽  
High Temperature Stress ◽  
Negative Effects ◽  
Tomato Seedlings ◽  
N Assimilation ◽  
N Metabolism ◽  
Exogenous Spermidine

We investigated the effects of exogenous spermidine (Spd) on the carbohydrate, nitrogen (N), and endogenous polyamine status of tomato (Solanum lycopersicum) seedlings exposed to high-temperature stress [38/28 °C (day/night)]. High-temperature stress reduced the contents of pyruvate and succinate and inhibited plant growth. The application of exogenous Spd alleviated the inhibition of plant growth induced by high temperature, and also led to an increase in pyruvate, citrate, and succinate levels. High temperature markedly increased the NH4+-N content and reduced the activities of nitrate reductase (NR), glutamine synthetase (GS), and glutamate dehydrogenase (GDH). Spd significantly alleviated the negative effects on NH4+-N assimilation induced by high-temperature stress. Moreover, Spd significantly increased the activities of NR and GDH in the high-temperature-stressed tomato leaves. In contrast, Spd application to high-temperature-stressed plant leaves counteracted high-temperature-induced mRNA expression changes in N metabolism. Spd significantly upregulated the transcriptional levels of NR, nitrite reductase, GS, GDH, and glutamate synthase (GOGAT). In addition, exogenous Spd significantly increased endogenous polyamines. These results suggest that Spd could improve carbohydrate and N status through regulating the gene expression and activity of key enzymes for N metabolism, thus confers the tolerance to high temperature on tomato seedlings.

Assessment of wheat (Triticum aestivum L.) genotypes for high temperature stress tolerance using physico-chemical analysis

2020 ◽  
Vol 53 (2) ◽  
Author(s):  
Khalil Ahmed Laghari ◽  
Abdul Jabbar Pirzada ◽  
Mahboob Ali Sial ◽  
Muhammad Athar Khan ◽  
Jamal Uddin Mangi
Keyword(s):  
Triticum Aestivum ◽  
High Temperature ◽  
Chemical Analysis ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Triticum Aestivum L ◽  
High Temperature Stress ◽  
Physico Chemical
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