Cadmium translocation by contractile roots differs from that in regular, non-contractile roots
© The Author 2015. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissionsoup.com..
BACKGROUND AND AIMS: Contractile roots are known and studied mainly in connection with the process of shrinkage of their basal parts, which acts to pull the shoot of the plant deeper into the ground. Previous studies have shown that the specific structure of these roots results in more intensive water uptake at the base, which is in contrast to regular root types. The purpose of this study was to find out whether the basal parts of contractile roots are also more active in translocation of cadmium to the shoot.
METHODS: Plants of the South African ornamental species Tritonia gladiolaris were cultivated in vitro for 2 months, at which point they possessed well-developed contractile roots. They were then transferred to Petri dishes with horizontally separated compartments of agar containing 50 µmol Cd(NO3)2 in the region of the root base or the root apex. Seedlings of 4-d-old maize (Zea mays) plants, which do not possess contractile roots, were also transferred to similar Petri dishes. The concentrations of Cd in the leaves of the plants were compared after 10 d of cultivation. Anatomical analyses of Tritonia roots were performed using appropriately stained freehand cross-sections.
KEY RESULTS: The process of contraction required specific anatomical adaptation of the root base in Tritonia, with less lignified and less suberized tissues in comparison with the subapical part of the root. These unusual developmental characteristics were accompanied by more intensive translocation of Cd ions from the basal part of contractile roots to the leaves than from the apical-subapical root parts. The opposite effects were seen in the non-contractile roots of maize, with higher uptake and transport by the apical parts of the root and lower uptake and transport by the basal part.
CONCLUSIONS: The specific characteristics of contractile roots may have a significant impact on the uptake of ions, including toxic metals from the soil surface layers. This may be important for plant nutrition, for example in the uptake of nutrients from upper soil layers, which are richer in humus in otherwise nutrient-poor soils, and also has implications for the uptake of surface-soil pollutants.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2015 |
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| Erschienen: |
2015 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:115 |
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| Enthalten in: |
Annals of botany - 115(2015), 7 vom: 21. Juni, Seite 1149-54 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Lux, Alexander [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 19.02.2016 Date Revised 13.11.2018 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1093/aob/mcv051 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM248676776 |
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| 100 | 1 | |a Lux, Alexander |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Cadmium translocation by contractile roots differs from that in regular, non-contractile roots |
| 264 | 1 | |c 2015 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 19.02.2016 | ||
| 500 | |a Date Revised 13.11.2018 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © The Author 2015. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissionsoup.com. | ||
| 520 | |a BACKGROUND AND AIMS: Contractile roots are known and studied mainly in connection with the process of shrinkage of their basal parts, which acts to pull the shoot of the plant deeper into the ground. Previous studies have shown that the specific structure of these roots results in more intensive water uptake at the base, which is in contrast to regular root types. The purpose of this study was to find out whether the basal parts of contractile roots are also more active in translocation of cadmium to the shoot | ||
| 520 | |a METHODS: Plants of the South African ornamental species Tritonia gladiolaris were cultivated in vitro for 2 months, at which point they possessed well-developed contractile roots. They were then transferred to Petri dishes with horizontally separated compartments of agar containing 50 µmol Cd(NO3)2 in the region of the root base or the root apex. Seedlings of 4-d-old maize (Zea mays) plants, which do not possess contractile roots, were also transferred to similar Petri dishes. The concentrations of Cd in the leaves of the plants were compared after 10 d of cultivation. Anatomical analyses of Tritonia roots were performed using appropriately stained freehand cross-sections | ||
| 520 | |a KEY RESULTS: The process of contraction required specific anatomical adaptation of the root base in Tritonia, with less lignified and less suberized tissues in comparison with the subapical part of the root. These unusual developmental characteristics were accompanied by more intensive translocation of Cd ions from the basal part of contractile roots to the leaves than from the apical-subapical root parts. The opposite effects were seen in the non-contractile roots of maize, with higher uptake and transport by the apical parts of the root and lower uptake and transport by the basal part | ||
| 520 | |a CONCLUSIONS: The specific characteristics of contractile roots may have a significant impact on the uptake of ions, including toxic metals from the soil surface layers. This may be important for plant nutrition, for example in the uptake of nutrients from upper soil layers, which are richer in humus in otherwise nutrient-poor soils, and also has implications for the uptake of surface-soil pollutants | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Apoplasmic barrier | |
| 650 | 4 | |a Casparian band | |
| 650 | 4 | |a Cd | |
| 650 | 4 | |a Tritonia gladiolaris | |
| 650 | 4 | |a Zea mays | |
| 650 | 4 | |a cadmium | |
| 650 | 4 | |a contractile roots | |
| 650 | 4 | |a endodermis | |
| 650 | 4 | |a heavy metal uptake | |
| 650 | 4 | |a maize | |
| 650 | 4 | |a root translocation | |
| 650 | 4 | |a soil pollution | |
| 650 | 7 | |a Soil Pollutants |2 NLM | |
| 650 | 7 | |a Cadmium |2 NLM | |
| 650 | 7 | |a 00BH33GNGH |2 NLM | |
| 700 | 1 | |a Lackovič, Andrej |e verfasserin |4 aut | |
| 700 | 1 | |a Van Staden, Johannes |e verfasserin |4 aut | |
| 700 | 1 | |a Lišková, Desana |e verfasserin |4 aut | |
| 700 | 1 | |a Kohanová, Jana |e verfasserin |4 aut | |
| 700 | 1 | |a Martinka, Michal |e verfasserin |4 aut | |
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