Exogenously applied hexaconazole ameliorates salinity stress by inducing an antioxidant defense system in Brassica napus L. plants

Akbari, Gholam Ali; Hojati, Mostafa; Modarres‐Sanavy, Seyed Ali Mohammad; Ghanati, Faezeh

doi:10.1016/j.pestbp.2011.04.008

Cited by 20 publications

(14 citation statements)

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“…The protective roles of POD, APX, and CAT against oxidative burst have also been reported in paclobutrazol-treated barley [58], quinoa [19] C. roseus [26], and Chinese bayberry [59] under various environmental stress conditions. Our findings are also similar to the previous reports in which triazole treatments increased the activities of antioxidant enzymes and delayed the leaf senescence rate in different crops [5,14,60]. Similarly, Wang et al [9] showed that the increased rate of ROS generation and the decreased activities of SOD, CAT, and APX in the leaves are strongly responsible for the accelerated leaf senescence in rice.…”

Section: Discussionsupporting

confidence: 92%

Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage

Kamran

Ahmad

et al. 2020

Agronomy

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In the present study, we examined the potential role of paclobutrazol in delaying leaf senescence, in causing changes in the activities of antioxidants, and in the maintenance of photosynthetic activity during the senescence process, and, therefore, on the grain yield of maize under semiarid field conditions. Maize seeds were pretreated with 0 (CK), 200 (PS1), 300 (PS2), and 400 (PS3) mg paclobutrazol L−1. Our results indicated that elevated levels of reactive oxygen species (ROS) and higher accumulation of malondialdehyde (MDA) contents were positively associated with accelerated leaf senescence during the grain-filling periods. The leaf senescence resulted in the disintegration of the photosynthetic pigments and reduced the net photosynthetic rate after silking. However, the resultant ROS burst (O2− and H2O2) was lessened and the leaf senescence and chlorophyll degradation were evidently inhibited in leaves of paclobutrazol-treated maize plants, which was strongly linked with upregulated activities of antioxidant enzymes in treated plants. The enhanced chlorophyll contents and availability of a greater photosynthetic active green leaf area during the grain filling period facilitated the maintenance of higher photosynthetic rate, and light-harvesting efficiency of photosynthesis associated with photosystem II (PSII) resulted in higher kernel number ear−1 and thousand kernel weights, and thus increased the final grain yield. The average maize grain yield was increased by 18.8% to 55.6% in paclobutrazol treatments, compared to untreated control. Among the various paclobutrazol treatments, PS2 (300 mg L−1) treatment showed the most promising effects on enhancing the activities of antioxidative enzymes, delaying leaf senescence and improving the yield of maize. Thus, understanding this effect of paclobutrazol on delaying leaf senescence introduces new possibilities for facilitating yield improvement of maize under semiarid conditions.

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Section: Discussionsupporting

confidence: 92%

Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage

Kamran

Ahmad

et al. 2020

Agronomy

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“…24‐EBL increased RWC and Ψ md of salt‐stressed canola, which indicates that 24‐EBL improved plant water status, as also observed in salt‐stressed canola treated with hexaconazole (Akbari et al . ). Remote infrared thermography is widely used in diagnosing plant stress, and is now used in phenotype screening of physiological status and detecting genetic variations because of the close relationship between temperature and stomatal conductance under water deficit conditions, such as drought and salt stress (Jones et al .…”

Section: Discussionmentioning

confidence: 97%

Effects of 24‐epibrassinolide on plant growth, osmotic regulation and ion homeostasis of salt‐stressed canola

et al. 2013

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This study evaluated effects of foliar spraying 24-epibrassinoide (24-EBL) on the growth of salt-stressed canola. Seedlings at the four-leaf stage were treated with 150 mM NaCl and different concentrations of 24-EBL (10(-6), 10(-8), 10(-10), 10(-12) M) for 15 days. A concentration of 10(-10) M 24-EBL was chosen as optimal and used in a subsequent experiment on plant biomass and leaf water potential parameters. The results showed that 24-EBL mainly promoted shoot growth of salt-stressed plants and also ameliorated leaf water status. Foliar spraying of salt-stressed canola with 24-EBL increased osmotic adjustment ability in all organs, especially in younger leaves and roots. This was mainly due to an increase of free amino acid content in upper leaves, soluble sugars in middle leaves, organic acids and proline in lower leaves, all of these compounds in roots, as well as essential inorganic ions. Na(+) and Cl(-) sharply increased in different organs under salt stress, and 24-EBL reduced their accumulation. 24-EBL improved the uptake of K(+), Ca(2+), Mg(2+) and NO3(-) in roots, which were mainly transported to upper leaves, while NO3(-) was mainly transported to middle leaves. Thus, 24-EBL improvements in ion homeostasis of K(+)/Na(+), Ca(2+)/Na(+), Mg(2+)/Na(+) and NO3(-)/Cl(-), especially in younger leaves and roots, could be explained. As most important parts, younger leaves and roots were the main organs protected by 24-EBL via improvement in osmotic adjustment ability and ion homeostasis. Further, physiological status of growth of salt-stressed canola was ameliorated after 24-EBL treatment.

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“…Canola (Brassica napus L.) is a moderately salt-tolerant crop, grown mainly for its edible oil (Akbari et al 2011). However, its production and quality are greatly reduced by soil salinity (Ruiz andBlumwald 2001, Lomonte et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Difference in Sodium Spatial Distribution in the Shoot of Two Canola Cultivars Under Saline Stress

Yang

Zheng

Liu

et al. 2012

Plant and Cell Physiology

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Among different mechanisms of salt resistance, regulation of ion distribution among various tissues and intracellular compartmentation are of great importance. In this study, we investigated the effects of salt stress on growth, photosynthesis, and Na(+) accumulation and distribution in leaf apoplast and symplast of two canola (Brassica napus L.) cultivars (NYY 1 and BZY 1). The results showed that the declines in shoot dry mass, leaf water potential and net photosynthetic rate of BZY 1 (salt sensitive) were higher than those of NYY 1 (salt resistant) in response to salt stress. Stomatal limitation to photosynthesis was mainly affected under moderate salinity, whereas the reduction in assimilation rate under severe salt stress was due to both stomatal and non-stomatal limitations. We also found that more Na(+) was distributed to leaf veins in NYY 1 than in BZY 1; simultaneously, less Na(+) accumulated in the leaf blade in NYY 1 than in BZY 1. The percentage of Na(+) in the leaf symplast in NYY 1 was markedly lower than that in BZY 1. Also, Na(+) diffusion in leaves through apoplastic and symplastic pathways of BZY 1 was stronger than that in NYY 1, and the transpiration rate in BZY 1, especially at the leaf edges, decreased more than in NYY 1. Our results showed that NYY 1 accumulated less Na(+) in the shoot, especially in leaf blades, and confined Na(+) to the apoplast to avoid leaf salt toxicity, which could be one reason for the higher resistance of NYY 1 than BZY 1 plants to salt stress.

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Exogenously applied hexaconazole ameliorates salinity stress by inducing an antioxidant defense system in Brassica napus L. plants

Cited by 20 publications

References 50 publications

Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage

Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage

Effects of 24‐epibrassinolide on plant growth, osmotic regulation and ion homeostasis of salt‐stressed canola

Difference in Sodium Spatial Distribution in the Shoot of Two Canola Cultivars Under Saline Stress

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