Radial widening of the Casparian strip follows induced radial expansion of endodermal cells

Yokoyama, Masaki; Karahara, Ichirou

doi:10.1007/s004250100536

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…A correlation between the width of the radial wall and that of the strip has been observed even in intact cells (Yokoyama and Karahara 2001). This suggests a pre-determined relationship between the radial growth of wall and Casparian strip.…”

Section: Functional Significance Of Changes In Casparian Strip Develomentioning

confidence: 93%

Development of the Casparian strip in primary roots of maize under salt stress

Karahara

Ikeda

Kondo

et al. 2004

Planta

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136

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The Casparian strip in the endodermis of vascular plant roots appears to play an important role in preventing the influx of salts into the stele through the apoplast under salt stress. The effects of salinity on the development and morphology of the Casparian strip in primary roots of maize ( Zea mays L.) were studied. Compared to the controls, the strip matured closer to the root tip with increase in the ambient concentration of NaCl. During growth in 200 mM NaCl, the number and the length of the endodermal cells in the region between the root tip and the lowest position of the endodermal strip decreased, as did the apparent rate of production of cells in single files of endodermal cells (the rate of cell formation being equal to the rate at which cells are lost from the meristem). The estimated time required for an individual cell to complete the formation of the strip after generation of the cell in the presence of 200 mM NaCl was not very different from that required in controls. Thus, salinity did not substantially affect the actual process of formation of the strip in individual cells. The radial width of the Casparian strip, a morphological parameter that should be related to the effectiveness of the strip as a barrier, increased in the presence of 200 mM NaCl. The mean width of the lignified region was 0.92 microm in distilled water and 1.33 microm in 200 mM NaCl at the lowest position of the strip. The mean width of the strip relative to that of the radial wall at this position was significantly greater after growth in the presence of 200 mM NaCl than in the controls, namely, 20.5% in distilled water and 33.9% in 200 mM NaCl. These observations suggest that the function of the strip is enhanced under salt stress.

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Section: Functional Significance Of Changes In Casparian Strip Develomentioning

confidence: 93%

Development of the Casparian strip in primary roots of maize under salt stress

Karahara

Ikeda

Kondo

et al. 2004

Planta

Self Cite

136

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“…1A-H). 4,5 Consequently, the primary walls become encrusted and sometimes thickened by the continuous deposition of phenolic and lipophilic biopolymers, blocking the submicroscopic capillaries in the primary cell wall and reducing apoplastic transport. Most importantly, the cell membrane of the endodermal cell is tightly attached to the primary cell wall at the Casparian strips, and it does not detach from the cell wall even if the tissue is exposed to severe plasmolysis.…”

Section: Introductionmentioning

confidence: 99%

Casparian strip development and its potential function in salt tolerance

Chen

Cai

et al. 2011

Plant Signaling & Behavior

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107

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“…Although oxygen loss, drought and salinity can influence the development and chemical nature of CSs in different rice cultivars, [15][16][17][18][19] few investigations have considered the development and formation of endo-and exdodermal CSs in the roots of rice cultivars with different salt tolerance under normal growing conditions.…”

mentioning

confidence: 99%

“…3 Therefore, the structure, 7-9 chemical nature, [10][11][12] and physiological function 13,14 of endo-and exdodermal CSs in roots have been the focus of many investigations. Although oxygen loss, drought and salinity can influence the development and chemical nature of CSs in different rice cultivars, [15][16][17][18][19] few investigations have considered the development and formation of endo-and exdodermal CSs in the roots of rice cultivars with different salt tolerance under normal growing conditions.…”

mentioning

confidence: 99%

Development of Casparian strip in rice cultivars

Cai

Chen

Zhou

et al. 2011

Plant Signaling & Behavior

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Plant roots are in direct contact with the soil environment and thus particularly affected by unfavorable conditions. To withstand the surrounding environment, roots have developed anatomical and physiological adaptations. The development of Casparian strips (CSs) in the root endo-and exodermis is one such strategy. [1][2][3] In roots of most species, the sequence of development of the endo-and exodermis is roughly the same and involves two consecutive developmental stages: (1) formation of CSs in radial and transverse walls impregnating the primary cell wall pores with lipophilic and aromatic substances and (2) deposition of suberin lamellae to the inner surface of anticlinal and tangential cell walls. [4][5][6] A major function of the CS is to block the non-selective apoplastic bypass flow of water and ions into the stele.3 Therefore, the structure, 7-9 chemical nature, [10][11][12] and physiological function 13,14 of endo-and exdodermal CSs in roots have been the focus of many investigations. Although oxygen loss, drought and salinity can influence the development and chemical nature of CSs in different rice cultivars, [15][16][17][18][19] few investigations have considered the development and formation of endo-and exdodermal CSs in the roots of rice cultivars with different salt tolerance under normal growing conditions.In the present paper, light microscopy and Fourier transform infrared (FTIR) spectroscopy were used to examine the cytochemistry and root anatomy of isolated CSs. The aim was to compare anatomical development and chemical characteristics of the endoand exdodermal CSs of three rice (Oryza sativa L.) cultivars having different salt tolerance in north China: the salt-tolerant Liaohan 109 and two widely grown cultivars, Tianfeng 202 and Nipponbare.The development of casparian strips (cSs) on the endo-and exodermis and their chemical components in roots of three cultivars of rice (Oryza sativa) with different salt tolerance were compared using histochemistry and Fourier transform infrared (FTIr) spectroscopy. The development and deposition of suberin lamellae of cSs on the endo-and exodermis in the salt-tolerant cultivar Liaohan 109 was earlier than in the moderately tolerant cultivar Tianfeng 202 and the sensitive cultivar Nipponbare. The detection of chemical components indicated major contributions to the structure of the outer part from aliphatic suberin, lignin and cell wall proteins and carbohydrates to the rhizodermis, exodermis, sclerenchyma and one layer of cortical cells in series (OPr) and the endodermal casparian strip. Moreover, the amounts of these major chemical components in the outer part of the Liaohan 109 root were higher than in Tianfeng 202 and Nipponbare, but there was no distinct difference in endodermal cSs among the three rice cultivars. The results suggest that the exodermis of the salt-tolerant cultivar Liaohan 109 functions as a barrier for resisting salt stress. Development of Casparian strips and suberin lamellae on the endo-and exodermis. Casparian strips in the end...

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Radial widening of the Casparian strip follows induced radial expansion of endodermal cells

Cited by 11 publications

References 21 publications

Development of the Casparian strip in primary roots of maize under salt stress

Development of the Casparian strip in primary roots of maize under salt stress

Casparian strip development and its potential function in salt tolerance

Development of Casparian strip in rice cultivars

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