The role of root apoplastic transport barriers in salt tolerance of rice (Oryza sativa L.)

Krishnamurthy, Pannaga; Ranathunge, Kosala; Franke, Rochus; Shetty, Shekar; Schreiber, Lukas; Mathew, M. K.

doi:10.1007/s00425-009-0930-6

Cited by 217 publications

(214 citation statements)

References 81 publications

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“…It is known that other environmental stresses might accelerate the development of exo-and endodermis (Enstone et al 2002). For example, apoplasmic barriers developed closer to the root apex in plants suffered by high salinity (Reinhardt & Rost 1995;Karahara et al 2004;Krishnamurthy et al 2009) and by drought stress (North & Nobel 1995).…”

Section: Discussionmentioning

confidence: 99%

Anatomical differences of poplar (Populus × euramericana clone I-214) roots exposed to zinc excess

et al. 2012

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Poplar is one of the suitable candidates for phytoremediation due to extensive root system, fast growth rate, easy propagation and high biomass production. Zinc (Zn) is an essential element, but at high concentration becomes toxic to plants, similarly like cadmium (Cd). In order to evaluate the effect of Zn on root tissue development we conducted experiments with poplar (Populus ×euramericana clone I-214) grown in hydroponics. Plants were treated with low (control) and excess level of Zn (1 mM). Changes in the development of apoplasmic barriers -Casparian bands and suberin lamellae in endodermis, as well as lignification of xylem vessels have been investigated. We found that both apoplasmic barriers developed closer to the root apex in higher Zn-treated root when compared with control root. Similar changes were observed in lignification of xylem vessels. For localization of Zn within root tissues, cryo-SEM/EDXMA analyses were used. Most of Zn was localized in the cortical tissues and four-time less Zn was determined in the inner part of the root below the endodermis. This indicates that endodermis serves as efficient barrier of apoplasmic Zn transport across the poplar root.

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Section: Discussionmentioning

confidence: 99%

Anatomical differences of poplar (Populus × euramericana clone I-214) roots exposed to zinc excess

et al. 2012

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“…Several class III peroxidases are glycosylated in many residues and it confers stability to high temperature and pH variation (Mathé et al, 2010). Plants can express several peroxidases involved in different physiological process such as defense mechanisms acting against pathogens (Kuzaniak and Sklodowska, 2005;Almagro et al, 2009), hormone regulation (Gutiérrez et al, 2009), lignin biosynthesis, oxidation of lignin precursor phenols (Fagerstedt et al, 2010), and responses to abiotic stresses including UV radiation and drought (Kim et al, 2007;Krishnamurthy et al, 2009). The relationship between peroxidase and water stress is related to protection of plant tissues against the oxidative stress built up under this condition (Reddy et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Purification and characterization of a peroxidase present in xilopodium exsudates of umbu plants (Spondias tuberosa A.)

Pinto¹,

Ribeiro²,

Araujo³

et al. 2015

Afr. J. Biotechnol.

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Umbu plants are drought resistant trees which are able to store water and several other substances into its adapted root, named xylopodium. The exsudate from xilopodium is a natural solution rich in salts, sugars and a little concentration of proteins. In this work, we report the purification of a peroxidase (POX) from umbu xilopodium exsudate by direct extraction from polyacrylamide electrophoresis gels. Umbu POX showed optimum activity at pHs around 6.0 to 7.0 and high thermal resistance after incubation at 70°C for 6 min. POX activity present in crude extracts was more heat-resistant than in its purified form. When assayed with metal ions, umbu POX activity was shown to be inhibited by Mn 2+ and stimulated by Ca 2+ and Mg 2+ ; it was also inhibited by sodium azide (concentrations higher then 1 mM) and not inhibited by either EDTA or tropolone. POX Km values for guaiacol and methylcatechol substrates were 6.83 and 22.25, respectively. The enzyme is proposed to be a guaiacol peroxidase and was seen to be located at higher concentrations in the outermost layers of xylopodium tissue, such as the endoderm.

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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.…”

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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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The role of root apoplastic transport barriers in salt tolerance of rice (Oryza sativa L.)

Cited by 217 publications

References 81 publications

Anatomical differences of poplar (Populus × euramericana clone I-214) roots exposed to zinc excess

Anatomical differences of poplar (Populus × euramericana clone I-214) roots exposed to zinc excess

Purification and characterization of a peroxidase present in xilopodium exsudates of umbu plants (Spondias tuberosa A.)

Development of Casparian strip in rice cultivars

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