Impact of osmotic stress on seedling growth observations, membrane characteristics and antioxidant defense system of different wheat genotypes

Mickky, Bardees M.; Aldesuquy, H. S.

doi:10.1016/j.ejbas.2016.10.001

Cited by 46 publications

(40 citation statements)

References 24 publications

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“…Because the radicle grows to be in direct contact with the culture medium, water is absorbed from the culture medium and then the plumule supplies it to the rest of the plant (Cavallaroa et al, 2016;Laghmouchi et al, 2017). Accordingly, PL and RL provide an important instance whereby plants can be studied in how they respond to environmental stress (Mickky and Aldesuquy, 2017). The strongest possibility to grow in arid and saline areas occurs for plants that can maintain a longer plumule and radicle when exposed to stress conditions (Goatley et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Screening and Selection of Twenty Iranian Wheatgrass Genotypes for Tolerance to Salinity Stress during Seed Germination and Seedling Growth Stage

Sheikh-Mohamadi

Etemadi

Nikbakht

et al. 2017

horts

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Desert wheatgrass (Agropyron desertorum L.), tall wheatgrass (Agropyron elongatum L.), and crested wheatgrass (Agropyron cristatum L.) are native cool-season grass species that exhibit potential as a low-input turfgrass. An increased understanding of the biochemical and physiological responses of wheatgrass species and genotypes to salt stress conditions is important for developing genotypes with enhanced tolerance to salinity. The objective of this study was to characterize the physiological and antioxidative properties in 20 Iranian wheatgrass genotypes and to observe their responses to salinity stress during seed germination and seedling growth stage. A completely randomized factorial design was used with two types of factors, four levels of salinity (0, 50, 100, and 150 mm of NaCl), wheatgrass genotypes, and three replicates. In this experiment, the results demonstrated that salinity limits the germination of Iranian wheatgrass genotype seeds. The result of this study showed that among the wheatgrass genotypes, ‘AD1’, ‘AD3,’ ‘AC6’, and ‘FA’ took the shortest average time to germinate. Higher levels of final germination percentage (FGP) were observed in ‘AD2’, ‘AD3’, and ‘AE5’ under salinity stress than other genotypes throughout the experiment. During a prolonged period of study, ‘AD1’ had greater rate of germination (GR) than other genotypes. Out of the 21 genotypes, five genotypes (‘AD1’, ‘AD2’, ‘AD3’, ‘AE5’, and ‘FA’ genotypes) were in the range of “salinity tolerant genotypes” cluster. The ‘AD1’, ‘AD2’, ‘AD3’, ‘AE5’, and ‘FA’ genotypes generally performed better than other genotypes under salinity conditions, mainly through maintaining higher enzymatic activities such as superoxide dismutase (SOD) (EC 1.15.1.1), catalase (CAT) (EC 1.11.1.6), ascorbate peroxidase (APX) (EC 1.11.1.11) and peroxidase (POD) (EC 1.111.1.7), and nonenzymatic antioxidant activities by glutathione (GSH). The ‘AD1’, ‘AD2’, ‘AD3’, ‘AE5’, and ‘FA’ genotypes also had higher proline levels and more of total nonstructural carbohydrates (TNC) content, lower malondialdehyde (MDA) content, and lower hydrogen peroxide content (H2O2).

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Section: Resultsmentioning

confidence: 99%

Screening and Selection of Twenty Iranian Wheatgrass Genotypes for Tolerance to Salinity Stress during Seed Germination and Seedling Growth Stage

Sheikh-Mohamadi

Etemadi

Nikbakht

et al. 2017

horts

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“…Under drought stress (Bani Seuf 7, Shandaweel 1 and Sakha 95) were tolerant genotypes, (Misr 2, Sohag 4 and Misr 1) were moderate genotypes, while (Giza 168, Misr 3 and Sids 12) were sensitive genotypes. In this regard, (Mickky et al 2017) studied some morphological traits on wheat seedlings after exposing wheat seedlings to PEG treatments and Sids 13 seemed to be the most tolerant variety followed by Masr 1, Masr 2, Gimmaza 9, Gimmaza 11, Sids 12, Sakha 93, Sakha 94, and Giza 186 and finally came Shandawel 1 with the maximum sensitivity. On the other hand, our results showed that under salinity stress, the tolerant genotypes included (Misr 2, Bani Seuf 7 and Sohag 4), the moderate genotypes included (Shandaweel 1and Sakha 95), and the sensitive genotypes included (Sids 12, Giza 168, Misr 1 and Misr 3).…”

Section: Discussionmentioning

confidence: 99%

Drought and salinity stress response in wheat: physiological andTaNACgene expression analysis in contrasting Egyptian wheat genotypes

2020

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Drought and salinity are significant stressors for crop plants, including wheat. The relationship between physiological mechanisms and gene expression is important for stress tolerance. NAC transcription factors (TFs) play vital roles in abiotic stress. In this study, we assessed the expression of four TaNAC genes with some physiological traits of nine Egyptian wheat genotypes under different concentrations of PEG and NaCl. All the physiological traits that we assessed declined under both stress conditions in all genotypes. In addition, all the genes that we measured were induced under both stress conditions in young leaves. Shandaweel 1, Bani Seuf 7, Sakha 95, and Misr 2 genotypes showed higher gene expression and were linked with a better genotypic performance in physiological traits under both stress conditions. In addition, we found an association between the expression of NAC genes and physiological traits. Overall, NAC genes may act as beneficial markers for selecting for genotypic tolerance to these stress conditions in wheat.

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“…The goal of the research presented here was to investigate adaptation to osmotic stress at germination in diverse landraces of chiles collected from different cultivation regimes and ecozones within southern Mexico. We used polyethylene-glycol (PEG) to induce osmotic stress at the seed stage, as has been done in germination studies of other cultivated and wild species [32][33][34][35][36][37][38][39][40]. In most prior studies, PEG solutions were used to identify cultivars which perform well under both stress and un-stressed conditions, whereas here we aimed to identify G×E interactions among populations as an indication of local adaptation to drought stress.…”

Section: Introductionmentioning

confidence: 99%

Germination response of diverse wild and landrace chile peppers (Capsicumspp.) under drought stress simulated with polyethylene glycol

Bernau

Barbolla

McHale

et al. 2020

Preprint

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AbstractResponses to drought within a single species may vary based on plant development stage, drought severity, and the avoidance or tolerance mechanisms employed. Early drought stress can restrict emergence and seedling growth. Thus, in areas where water availability is limited, rapid germination leading to early plant establishment may be beneficial. Alternatively, germination without sufficient water to support the seedling may lead to early senescence, so reduced germination under low moisture conditions may be adaptive at the level of the population. We studied the germination response to osmotic stress of diverse chile pepper germplasm collected in southern Mexico from varied ecozones, cultivation systems, and of named landraces. Drought stress was simulated using polyethylene glycol solutions. Overall, survival time analysis revealed delayed germination at the 20% concentration of PEG across all ecozones. The effect was most pronounced in the genotypes from hotter, drier ecozones. Additionally, accessions from wetter and cooler ecozones had the fastest rate of germination. Moreover, accessions of the landraces Costeño Rojo and Tusta germinated more slowly and incompletely if sourced from a drier ecozone than a wetter one, indicating that slower, reduced germination under drought stress may be an adaptive avoidance mechanism. Significant differences were also observed between named landraces, with more domesticated types from intensive cultivation systems nearly always germinating faster than small-fruited backyard- or wild-types, perhaps due to the fact that the smaller-fruited accessions have generally undergone less selection. Thus, we conclude that there is evidence of local adaptation to both ecozone of origin and source cultivation system in germination characteristics of diverse chile peppers.

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Impact of osmotic stress on seedling growth observations, membrane characteristics and antioxidant defense system of different wheat genotypes

Abstract: View related articles View Crossmark data Citing articles: 2 View citing articles Full Length Article Impact of osmotic stress on seedling growth observations, membrane characteristics and antioxidant defense system of different wheat genotypes

Cited by 46 publications

References 24 publications

Screening and Selection of Twenty Iranian Wheatgrass Genotypes for Tolerance to Salinity Stress during Seed Germination and Seedling Growth Stage

Screening and Selection of Twenty Iranian Wheatgrass Genotypes for Tolerance to Salinity Stress during Seed Germination and Seedling Growth Stage

Drought and salinity stress response in wheat: physiological andTaNACgene expression analysis in contrasting Egyptian wheat genotypes

Germination response of diverse wild and landrace chile peppers (Capsicumspp.) under drought stress simulated with polyethylene glycol

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