Exogenous application of hydrogen peroxide alleviates drought stress in cucumber seedlings
By Y. Sun, Hao Wang, S. Liu, X. Peng. 2016
90 citations recorded by the source corpus.
Abstract Drought limits plant growth and crop yield worldwide and more frequent occurrences of water shortages are expected according to climate change projections. However, relatively little is known about whether the spraying of plants leaves with hydrogen peroxide (H 2 O 2 ) would alleviate the symptoms of drought stress. In this study, 3-week-old cucumber seedlings exposed to different soil water contents (non-limiting soil water conditions, medium drought, and severe drought) were foliar-sprayed with 1.5 mM H 2 O 2 . Growth, photosynthesis and oxidative defense system were determined after one week of treatment. Results showed that exogenous H 2 O 2 significantly increased biomass, leaf relative water content (RWC) and chlorophyll content, coupled with increased net photosynthetic rate ( P n ), especially under medium drought. Meanwhile, superoxide anion radicals (O 2 − ), electrolyte leakage and malondialdehyde (MDA) levels decreased whereas the activities of key antioxidant enzymes superoxide dismutase (SOD) and peroxidase (POD) as well as soluble sugar and proline contents increased in H 2 O 2 -treated plants. Hence, exogenously applied H 2 O 2 considerably improved drought tolerance of cucumber plants by increasing the plant antioxidative defense system and the capacity for osmotic adjustment to alleviate membrane lipid peroxidation and to reestablish cell turgor, and thereby increasing photosynthesis, particularly under medium drought.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/6bac86ffb85fbc59f08406eb5a1e456254b48bd9
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In Plant Science
Citations in the corpus
- Reactive Oxygen Species and Antioxidant Defense in Plants under Abiotic Stress: Revisiting the Crucial Role of a Universal Defense Regulator (2020, background): “In addition, H2O2 is a critical component of stress response regulation in crop plants such as rice [13], wheat [14], maize [15], mung bean [16], soybean [17], cucumber [18], sour orange [19], strawberry [20], basil [21], and rapeseed [22].”
- Exogenous salicylic acid and hydrogen peroxide attenuate drought stress in rice (2020, background): “…both H2O2 or SA application increased the RWC, and application of SA and low dose of H2O2 decreased Pro content, but high dose of H2O2 showed no effect on Pro content (Figure 2C, D), as also observed in Cymbopogn flexuosus and cucumber under drought (Idrees et al. 2010, Sun et al. 2016).”