Effects of lead toxicity on growth and cell wall extensibility in rice seedlings

Hossain, Mohammad Talim; Soga, Kouichi; Wakabayashi, Kazuyuki; Hoson, Takayuki

doi:10.3329/bjb.v44i2.38526

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Our study showed that compared with AC, L and H treatments significantly reduced plant height, root length, dry weight, and fresh weight of rice seedlings. The results showed that Pb toxicity had inhibitory effect on rice seedling biomass accumulation, which was consistent with previous research results (Hussain et al 2018;Mishra and Choudhuri 1998). In addition, compared with AC, there was no significant change in rice dry matter rate under L and H treatments.…”

Section: The Effects On the Rice Seedlings Under Pb Stresssupporting

confidence: 91%

High Concentration of CO2 Improve the Pb Resistance of Oryza sativa L. Seedlings by Enhancing Photosynthesis and Regulating Plant Endogenous Hormones

Wang

Zou

et al. 2021

J Plant Growth Regul

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Rice seedlings were treated with different concentrations of Pb solutions or /and CO 2 (Pb 0 μM + CO 2 400 ± 20 μmol/mol, AC; Pb 0 μM + 800 ± 20 µmol/mol, EC; Pb 50 μM + CO 2 400 ± 20 μmol/mol, L; Pb 150 μM + CO 2 400 ± 20 μmol/mol, H; Pb 50 μM + CO 2 400 ± 20 μmol/mol, EC + L; Pb 150 μM + CO 2 800 ± 20 μmol/mol, EC + H;), so as to study the effects of Pb stress and/or elevated CO 2 on growth, photosynthesis, and endogenous hormones. We measured the biomass, photosynthetic gas exchange parameters, fluorescence parameters and their curves (O-J-I-P, Variable fluorescence) and the contents and ratio of endogenous hormones in rice seedlings. The results show that: (1) Both L and H had negative effects on the growth of rice seedlings. However, H treatment had a significant negative effect on PSII of rice seedlings, but L treatment had no significant effect. In addition, JA (jasmonic acid) and ABA (abscisic acid) were significantly associated with the decrease of G S in Rice under Pb stress. (2) Under EC treatment, the secretion of growth hormones increased significantly. More importantly, the content of JA increased significantly while G S decreased, but ABA did not, which may mean that JA is more sensitive to stomatal regulation under EC. (3) Compared with L and H, EC + L and EC + H manifested in the enhancement of photosynthetic performance and adjustment of hormone ratio. Compound treatment significantly increased the ratio of "promoting-hormone to ABA" compare with L and H treatment. The biomass accumulation of rice seedlings increased significantly after being affected by changes in hormone ratios and enhanced photosynthesis. Therefore, the high concentration CO 2 reduces the harm of Pb to a certain extent. However, this relief is also limited. Compared with H, EC + H has no alleviating effect on rice seedling most growth and photosynthetic parameters.

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Section: The Effects On the Rice Seedlings Under Pb Stresssupporting

confidence: 91%

High Concentration of CO2 Improve the Pb Resistance of Oryza sativa L. Seedlings by Enhancing Photosynthesis and Regulating Plant Endogenous Hormones

Wang

Zou

et al. 2021

J Plant Growth Regul

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“…Water deficit reportedly decreased the cell wall extensibility in the hypocotyl of soybean (Wu et al 2005), and drought stress decreased the cell wall elasticity in rose leaves (Al-Yasi et al 2020). Si application was shown to increase the leaf cell wall extensibility in rice, oat, and wheat seedlings (Hossain et al 2002), and lead exposure reduced the leaf cell wall extensibility in rice (Hossain et al 2015). NH4 + -toxicity reportedly increases the cell wall rigidity, which limits the expansion of leaf cells (Podgórska et al 2017).…”

Section: Introductionmentioning

confidence: 98%

Differential responses of roots for varying tolerance to salinity stress in wheat with special reference to elasticity

Yang

Feng

et al. 2021

Plant Growth Regul

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Two salt-sensitive (Yongliang-15, GS-6058) and two salt-tolerant (JS-7, Xinchun-31) wheat cultivars were used to investigate the extension, extensibility (viscoelastic parameters), and chemical composition of the cell walls in their root elongation regions (apical 10 mm-long root segments), under salinity stress. The elasticity of the root cell wall, indicated by E0, significantly decreased in the salt-sensitive cultivars, whereas the E0 in the salt-tolerant cultivars was maintained at the same level as that in the non-saline condition. Root extension and the differences among cultivars were largely dependent on elastic extension, which accounts for one-half to two-thirds of the total extension. Viscosity, indicated by η0, and the plastic extension of the root cell walls did not change across the treatments and cultivars. The significant decrease in cell wall elasticity in the root elongation region was one of the factors that depressed root growth in salt-sensitive cultivars under the saline condition. The well-maintained elasticity of salt-tolerant cultivars alleviated the depression of root growth by NaCl. Cell wall elasticity was positively correlated with the relative pectin and hemicellulose I contents and negatively correlated with the relative cellulose content. Under saline conditions, the relative hemicellulose II content did not change in the salt-sensitive cultivars; however, it decreased in the salt-tolerant ones. Thus, changes in chemical composition of the cell wall were correspond with the cell wall extensibility and root growth in wheat cultivars with different degrees of salt tolerance.

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“…Similarly, lead (Pb) accumulates mainly in the roots, where it has a high affinity for galacturonic acid [ 28 ], which may change pectin structure and decrease cell wall extensibility. Finally, Pb has been found to reduce cell wall extensibility by influencing the synthesis of cell wall polysaccharides [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Cell Wall Components and Extensibility Regulate Root Growth in Suaeda salsa and Spinacia oleracea under Salinity

Liu

Shao

Feng

et al. 2022

Plants

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Understanding the role of root cell walls in the mechanism of plant tolerance to salinity requires elucidation of the changes caused by salinity in the interactions between the mechanical properties of the cell walls and root growth, and between the chemical composition of the cell walls and root growth. Here, we investigated cell wall composition and extensibility of roots by growing a halophyte (Suaeda salsa) and a glycophyte (Spinacia oleracea) species under an NaCl concentration gradient. Root growth was inhibited by increased salinity in both species. However, root growth was more strongly reduced in S. oleracea than in S. salsa. Salinity reduced cell wall extensibility in S. oleracea significantly, whereas treatment with up to 200 mM NaCl increased it in S. salsa. Meanwhile, S. salsa root cell walls exhibited relatively high cell wall stiffness under 300 mM NaCl treatment, which resist wall deformation under such stress conditions. There was no decrease in pectin content with salinity treatment in the cell walls of the elongation zone of S. salsa roots. Conversely, a decrease in pectin content was noted with increasing salinity in S. oleracea, which might be due to Na+ accumulation. Cellulose content and uronic acid proportions in pectin increased with salinity in both species. Our results suggest that (1) cell wall pectin plays important roles in cell wall extension in both species under salinity, and that the salt tolerance of glycophyte S. oleracea is affected by the pectin; (2) cellulose limits root elongation under saline conditions in both species, but in halophytes, a high cell wall content and the proportion of cellulose in cell walls may be a salt tolerance mechanism that protects the stability of cell structure under salt stress; and (3) the role of the cell wall in root growth under salinity is more prominent in the glycophyte than in the halophyte.

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Effects of lead toxicity on growth and cell wall extensibility in rice seedlings

Cited by 4 publications

References 3 publications

High Concentration of CO2 Improve the Pb Resistance of Oryza sativa L. Seedlings by Enhancing Photosynthesis and Regulating Plant Endogenous Hormones

High Concentration of CO2 Improve the Pb Resistance of Oryza sativa L. Seedlings by Enhancing Photosynthesis and Regulating Plant Endogenous Hormones

Differential responses of roots for varying tolerance to salinity stress in wheat with special reference to elasticity

Cell Wall Components and Extensibility Regulate Root Growth in Suaeda salsa and Spinacia oleracea under Salinity

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