Effects of brassinosteroids on the plant responses to environmental stresses

Bajguz, Andrzej; Hayat, Shamsul

doi:10.1016/j.plaphy.2008.10.002

Cited by 782 publications

(471 citation statements)

References 59 publications

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“…It has been reported earlier that BRs induced the expression of biosynthetic genes of proline (Ozdemir et al 2004). Moreover, BRs also increased proline content as well as the activity of antioxidant enzymes in sorghum plants, exposed to osmotic, Cd, Al, Ni and Cu stresses (Bajguz and Hayat 2009).…”

Section: Discussionmentioning

confidence: 62%

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Yusuf

Fariduddin

Ahmad

et al. 2014

Physiol Mol Biol Plants

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The role of 28-homobrassinolide (HBL) in countering nickel-induced oxidative damage through overexpression of antioxidant enzymes and proline in Vigna radiata has been investigated. Two varieties of V. radiata, one sensitive to Ni (PDM-139) and the other tolerant to Ni (T-44), were sown in the soil fed with different levels (0, 50, 100 or 150 mg kg −1 ) of Ni, and at 29-day stage, foliage of plants was applied with deionized water (control), 10 −8 or 10 −6 M of HBL. The plants were sampled at 45-day stage of growth to assess various physiological as well as biochemical characteristics. The remaining plants were allowed to grow up to maturity to study the yield characteristics. The growth traits, leghemoglobin, nitrogen and carbohydrate content in the nodules, leaf chlorophyll content, photosynthesis efficiency, leaf water potential, activities of nitrate reductase, carbonic anhydrase and nitrogenase decreased proportionately with the increasing concentrations of nickel, whereas electrolyte leakage, various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and accumulation of proline increased at 45-day stage. However, the exogenously applied HBL to the nickel-stressed or non-stressed plants improved growth, nodulation and photosynthesis and further enhanced the various antioxidant enzymes viz. catalase, peroxidase and superoxide dismutase and accumulation of proline. The deleterious impact of Ni on the plants was concentration dependent where HBL applied to the foliage induced overexpression of antioxidant enzyme and accumulation of proline (osmolyte) which could have conferred tolerance to Ni up to 100 mg kg −1 , resulting in improved growth, nodulation, photosynthesis and yield attributes.

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Section: Discussionmentioning

confidence: 62%

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Yusuf

Fariduddin

Ahmad

et al. 2014

Physiol Mol Biol Plants

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“…Brassinosteroids are steroidal plant hormones involved in a wide range of developmental processes as well as in plant responses to environmental stresses via activation of different protective mechanisms (for review see [ 1 ]). To date the mechanisms by which these compounds are involved in plant stress responses are not clear.…”

mentioning

confidence: 99%

“…It has been shown that the EBR application exerts a direct role in the regulation of plant photosynthesis [ 2 ]. Several studies have also reported the role of EBR in the protection of photosynthetic apparatus against environmental stresses by enhancing plant tolerance to abiotic stresses [ 1,[3][4][5] ]. Brassinosteroid-enhanced stress tolerance was proposed to relate to increased activity of the reactive oxygen species scavenging system -antioxidant enzymes (via accumulation of abscisic acid) and with increased content of ascorbic acid and carotenoids [ 1,3,5 ].…”

mentioning

confidence: 99%

Effects of 24-epibrassinolide Pre-treatment on UV-B-Induced Changes in the Pigment Content of Pea Leaves

Dobrikova¹,

Vladkova²,

Stanoeva³

et al. 2013

Proceeding BAS

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In the present work, the effects of 24-epibrassinolide (EBR) on the UV-Binduced changes in the pigment content of pea leaves were studied. Control (non-EBR-treated) and EBR-treated plants were irradiated with UV-B for 3 h and pigment analysis was performed after 24 and 48 h. The results show that EBR spraying of plants 48 h prior to UV-B exposure alleviates its detrimental effect on chlorophyll a and b (Chl a and Chl b) content in comparison with control pea leaves. An increase in carotenoids (Car) and UV-B absorbing compounds was also observed at low dose of UV-B radiation. For the first time, it is shown that UV-B damage effect on control leaves is accompanied by a significant (more than 50%) increase in their pheophytin a (Pheo a) content 48 h after the UV-B exposure and that the EBR pre-treatment prevents the increase of Pheo a content in UV-B irradiated leaves. In addition, it is demonstrated that EBR application modifies UV-B-induced alterations of energy distribution between the main pigment-protein complexes in pea thylakoid membranes.

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“…AMF plants also efficiently absorb micronutrients, magnesium, and calcium including iron, zinc, and boron (Garg & Pandey, 2014), which are essential in various plant functions. Similarly, it has also been reported that HBL increases K + /Na + ratio and stimulates uptake of N, P, K, and other mineral elements (Ekinci et al., 2012) through enhanced proton pumping of sodium ion, which might be one of the mechanisms in stress tolerance of cucumber cultivars (Bajguz & Hayat, 2009; Hayat et al., 2014). It is interesting to observe the combination of HBL spraying intervals and AMF showed more pronounced effects in improvement of growth parameters, perhaps due to their additive effects as reported by Ghazanfar et al.…”

Section: Discussionmentioning

confidence: 99%

The combination of arbuscular mycorrhizal fungi inoculation (Glomus versiforme) and 28‐homobrassinolide spraying intervals improves growth by enhancing photosynthesis, nutrient absorption, and antioxidant system in cucumber (Cucumis sativus L.) under salinity

Ahmad

Hayat

Ali

et al. 2018

Ecology and Evolution

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Salinity is one of the major obstacles in the agriculture industry causing huge losses in productivity. Several strategies such as plant growth regulators with arbuscular mycorrhizal fungi (AMF) have been used to decrease the negative effects of salt stress. In our experiment, 28‐homobrassinolide (HBL) with spraying intervals was combined with AMF (Glomus versiforme) in cucumber cultivars Jinyou 1# (salt sensitive) and (Changchun mici, in short, CCMC, salt tolerant) under NaCl (100 mmol/L). Studies have documented that the foliar application of HBL and AMF colonization can enhance tolerance to plants under stress conditions. However, the mechanism of the HBL spraying intervals after 15 and 30 days in combination with AMF in cucumber under salt stress is still unknown. Our results revealed that the HBL spraying interval after 15 days in combination with AMF resulted in improved growth, photosynthesis, and decreased sodium toxicity under NaCl. Moreover, the antioxidant enzymes SOD (superoxide dismutase; EC 1.15.1.1) and POD activity (peroxidase; EC 1.11.1.7) showed a gradual increase after every 10 days, while the CAT (catalase; EC 1.11.1.6) increased after 30 days of salt treatments in both cultivars. This research suggests that the enhanced tolerance to salinity was mainly related to elevated levels of antioxidant enzymes and lower uptake of Na+, which lowers the risk of ion toxicity and decreases cell membrane damage.

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Effects of brassinosteroids on the plant responses to environmental stresses

Cited by 782 publications

References 59 publications

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Brassinosteroid-mediated evaluation of antioxidant system and nitrogen metabolism in two contrasting cultivars of Vigna radiata under different levels of nickel

Effects of 24-epibrassinolide Pre-treatment on UV-B-Induced Changes in the Pigment Content of Pea Leaves

The combination of arbuscular mycorrhizal fungi inoculation (Glomus versiforme) and 28‐homobrassinolide spraying intervals improves growth by enhancing photosynthesis, nutrient absorption, and antioxidant system in cucumber (Cucumis sativus L.) under salinity

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