Silicon increases cell wall thickening and lignification in rice (Oryza sativa) root tip under excess Fe nutrition

Mehrabanjoubani, Pooyan; Abdolzadeh, Ahmad; Sadeghipour, Hamid Reza; Aghdasi, Mahnaz; Bagherieh‐Najjar, Mohammad B.

doi:10.1016/j.plaphy.2019.09.047

Cited by 38 publications

(12 citation statements)

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“…28,41,42 Additionally, Si application can promote Casparian band formation 43 and earlier initiation of lignin polymerization and thus enhance retardation of excess Fe on outliers of roots. 44 Excess Fe on a root surface could accelerate the formation of iron plaque, 45 Table 1 the "barrier" effect of which could result in reducing the accumulation of Cd in rice tissues. 46 Additionally, Si applications could regulate Cd transporters and phytochelatin gene transcription to reduce Cd uptake and translocation at the molecular level.…”

Section: Discussionmentioning

confidence: 99%

“…Si is not regarded as an essential element for plants, but it can alleviate the phytotoxicity induced by non-essential heavy metals and excess essential elements, including Cd stress. , Si can ameliorate Cd translocation in rice via various mechanisms occurring within the rice plant . In root, Si could be tightly bound to the plant cell walls, forming organosilicon (Si–O–C linkage), and compartmentalized into the vacuoles, which could co-localize Cd and form insoluble Cd–Si complexes in the cell wall to reduce Cd toxicity. ,, Additionally, Si application can promote Casparian band formation and earlier initiation of lignin polymerization and thus enhance retardation of excess Fe on outliers of roots . Excess Fe on a root surface could accelerate the formation of iron plaque, the “barrier” effect of which could result in reducing the accumulation of Cd in rice tissues .…”

Section: Discussionmentioning

confidence: 99%

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Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Zhou

Gao

Cui

et al. 2021

ACS Agric. Sci. Technol.

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Minimization of cadmium (Cd) in edible parts of crops is regarded as an effective approach for reducing the threat of Cd to public health. Beneficial elements selenium (Se) and silicon (Si) have been shown to promote rice growth and to reduce the rice Cd concentration under Cd stress. We performed a field experiment that highlighted the role of stem nodes and foliar Si and Se sprayings on the accumulation of Cd in 14 rice tissues, including brown rice, husk, panicle, four nodes, four internodes, and three leaves. The results indicated that foliar Se and Si applications significantly decreased brown rice Cd concentrations by 56% and 50% from 1.5 mg kg–1 to 0.66 and 0.75 mg kg–1, respectively. The applications of Se and Si were mainly through the reduction of the accumulation of Cd in rice roots by 27% and 32%, resulting in decreases in Cd in nodes by 53–76% and 26–60% respectively, while Cd concentrations were not significantly reduced in leaves and internodes. The first node beneath the panicle (N I) also played a critical role in the allocation of Cd within rice plants, whereas foliar Se and Si sprayings significantly reduced the extent of transfer of Cd from node I to the first internode and rice grain and significantly increased the extent of transfer of Cd to the flag leaf. However, N III had no effects on the transport of Cd to upper organs and N II promoted the translocation of Cd to upper organs after applications of Se and Si. Applications of Se and Si also improve the uptake of most of the mineral nutrients in N I. Overall, reduction of Cd in rice root and nodes and allocation of Cd in N I are the key steps in the accumulation of Cd in brown rice.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Zhou

Gao

Cui

et al. 2021

ACS Agric. Sci. Technol.

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“…Besides, PM NADPH oxidase binding to intercellular SOD is also the main factor of apoplastic H 2 O 2 production. Excessive Fe treatment signi cantly increased apoplastic H 2 O 2 content in rice roots primarily due to greater activities of both NADPH oxidase and SOD (Mehrabanjoubani et al 2019). Similarly, Fe-induced activation of NADPH oxidase (Fig.…”

Section: Effects Of Different Treatments On Cw-bound Gpx and Capx Act...mentioning

confidence: 99%

“…5c) in wheat roots was responsible for apoplastic H 2 O 2 accumulation when wheat roots were exposed to excessive Fe concentration. The study of Mehrabanjoubani et al (2019) suggested an important role of CW-bound POD in conjunction with NADPH oxidase and SOD in development of ligni ed tissues in the rice root apical part under excess Fe nutrition. Therefore, the presence of different Zn concentration signi cantly inhibited the activities of NADPH oxidase and apoplastic SOD signi cantly in Fe-stressed roots, thus reducing lignin content but obviously promoting root growth when wheat seedlings were exposed to Fe treatment.…”

Section: Effects Of Different Treatments On Cw-bound Gpx and Capx Act...mentioning

confidence: 99%

WITHDRAWN: Lignin metabolism involved in zinc-alleviating effects on iron-induced phytotoxicity in wheat roots

Zhang

et al. 2022

Preprint

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In order to reveal the mechanisms of Fe-inhibited plant root growth and Zn-alleviating effects on iron (Fe) toxicity, wheat cultivars Xihan 4 seedlings were used to investigate the relationship between root growth and synthetic metabolism of lignin in response to 300 µM Fe stress alone or in combination with 50 or 250 µM zinc (Zn). Fe-alone-exposed roots exhibited significant increase of cell wall lignin content and the stimulation of phenylalanine ammonia-lyase (PAL), 4-coumarate:CoA ligase (4CL), cinnamyl alcohol dehydrogenase (CAD), laccase (LAC), cell wall bound guaiacol peroxidase activity (CW-bound GPX) and conifers alcohol peroxidase (CAPX) activities as well as the up-regulation of TaPAL, Ta4CL, TaCAD and TaLAC expression. In comparison with Fe stress alone, the presence of Zn effectively alleviated the changes of these parameters in Fe-treated roots. And also, the results of lignin staining in the root tissue were consistent with those of lignin detection in wheat seedlings under different treatments. Further study showed the increase of apoplastic hydrogen peroxide (H2O2) content in conjunction with the stimulation of CW-bound nicotinamide adenine dinucleotide (NADH) oxidase, plasma membrane (PM) nicotinamide adenine dinucleotide phosphate (NADPH) oxidase and apoplastic superoxide dismutase (SOD) in Fe-alone-stressed roots compared with untreated ones, but Fe + Zn treatment partially reversed the changes of these parameters in comparison with Fe exposure alone. Furthermore, the application of exogenous H2O2 not only enhanced the amount of cell wall lignin in Zn + Fe-treated roots but also significantly blocked Zn-alleviating effect on Fe-induced inhibition of root growth. In conclusion, the inhibition of root growth was associated with the increased accumulation of cell wall lignin in response to Fe exposure alone, which was due to the stimulation of lignin metabolizing enzymes and the up-regulation of related enzyme gene expression and the increase of apoplastic H2O2 generation in wheat roots under Fe exposure alone. It was also suggested that Zn-alleviating effect on Fe-induced inhibition of root growth might be related to the reduction of lignin content of root cell wall resulting from the decrease of apoplastic H2O2 content when wheat seedlings were exposed to Fe + Zn treatment.

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“…The activity of PAL varied with the development stage of plants and the differentiation degree of cells and tissues [ 37 , 38 ]. Under excess Fe nutrition, plant growth was suppressed, and the activity of PAL was enhanced [ 39 ], indicating that the increase in PAL activity might inhibit plant growth. In our study, the activity and relative expression of PAL decreased with ETH treatment ( Figure 5 ), indicating that the ETH might have induced adventitious rooting by reducing PAL activity and its gene expression.…”

Section: Discussionmentioning

confidence: 99%

Identification of Key Genes during Ethylene-Induced Adventitious Root Development in Cucumber (Cucumis sativus L.)

Deng

Wang

Zhang

et al. 2022

IJMS

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Ethylene (ETH), as a key plant hormone, plays critical roles in various processes of plant growth and development. ETH has been reported to induce adventitious rooting. Moreover, our previous studies have shown that exogenous ETH may induce plant adventitious root development in cucumber (Cucumis sativus L.). However, the key genes involved in this process are still unclear. To explore the key genes in ETH-induced adventitious root development, we employed a transcriptome technique and revealed 1415 differentially expressed genes (DEGs), with 687 DEGs up-regulated and 728 DEGs down-regulated. Using Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis, we further identified critical pathways that were involved in ETH-induced adventitious root development, including carbon metabolism (starch and sucrose metabolism, glycolysis/gluconeogenesis, citrate cycle (TCA cycle), oxidative phosphorylation, fatty acid biosynthesis, and fatty acid degradation), secondary metabolism (phenylalanine metabolism and flavonoid biosynthesis) and plant hormone signal transduction. In carbon metabolism, ETH reduced the content of sucrose, glucose, starch, the activity of sucrose synthase (SS), sucrose–phosphate synthase (SPS) and hexokinase (HK), and the expressions of CsHK2, pyruvate kinase 2 (CsPK2), and CsCYP86A1, whereas it enhanced the expressions of β-amylase 1 (CsBAM1) and β-amylase 3 (CsBAM3). In secondary metabolism, the transcript levels of phenylalanine ammonia-lyase (CsPAL) and flavonoid 3′-monooxygenase (CsF3′M) were negatively regulated, and that of primary-amine oxidase (CsPAO) was positively regulated by ETH. Additionally, the indole-3-acetic acid (IAA) content and the expressions of auxin and ETH signaling transduction-related genes (auxin transporter-like protein 5 (CsLAX5), CsGH3.17, CsSUAR50, and CsERS) were suppressed, whereas the abscisic acid (ABA) content and the expressions of ABA and BR signaling transduction-related genes (CsPYL1, CsPYL5, CsPYL8, BRI1-associated kinase 1 (CsBAK1), and CsXTH3) were promoted by ETH. Furthermore, the mRNA levels of these genes were confirmed by real-time PCR (RT-qPCR). These results indicate that genes related to carbon metabolism, secondary metabolite biosynthesis, and plant hormone signaling transduction are involved in ETH-induced adventitious root development. This work identified the key pathways and genes in ETH-induced adventitious rooting in cucumber, which may provide new insights into ETH-induced adventitious root development and will be useful for investigating the molecular roles of key genes in this process in further studies.

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Silicon increases cell wall thickening and lignification in rice (Oryza sativa) root tip under excess Fe nutrition

Cited by 38 publications

References 42 publications

Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

Influence of Silicon and Selenium and Contribution of the Node to Cadmium Allocation and Toxicity in Rice

WITHDRAWN: Lignin metabolism involved in zinc-alleviating effects on iron-induced phytotoxicity in wheat roots

Identification of Key Genes during Ethylene-Induced Adventitious Root Development in Cucumber (Cucumis sativus L.)

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