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Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice
Zinc (Zn) deficiency is one of the leading nutrient disorders in rice (Oryza sativa). Many studies have identified Zn-efficient rice genotypes, but causal mechanisms for Zn deficiency tolerance remain poorly understood. Here, we report a detailed study of the impact of Zn deficiency on crown root de...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4815024/ https://www.ncbi.nlm.nih.gov/pubmed/27066060 http://dx.doi.org/10.3389/fpls.2016.00428 |
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author | Nanda, Amrit K. Wissuwa, Matthias |
author_facet | Nanda, Amrit K. Wissuwa, Matthias |
author_sort | Nanda, Amrit K. |
collection | PubMed |
description | Zinc (Zn) deficiency is one of the leading nutrient disorders in rice (Oryza sativa). Many studies have identified Zn-efficient rice genotypes, but causal mechanisms for Zn deficiency tolerance remain poorly understood. Here, we report a detailed study of the impact of Zn deficiency on crown root development of rice genotypes, differing in their tolerance to this stress. Zn deficiency delayed crown root development and plant biomass accumulation in both Zn-efficient and inefficient genotypes, with the effects being much stronger in the latter. Zn-efficient genotypes had developed new crown roots as early as 3 days after transplanting (DAT) to a Zn deficient field and that was followed by a significant increase in total biomass by 7 DAT. Zn-inefficient genotypes developed few new crown roots and did not increase biomass during the first 7 days following transplanting. This correlated with Zn-efficient genotypes retranslocating a higher proportion of shoot-Zn to their roots, compared to Zn-inefficient genotypes. These latter genotypes were furthermore not efficient in utilizing the limited Zn for root development. Histological analyses indicated no anomalies in crown tissue of Zn-efficient or inefficient genotypes that would have suggested crown root emergence was impeded. We therefore conclude that the rate of crown root initiation was differentially affected by Zn deficiency between genotypes. Rapid crown root development, following transplanting, was identified as a main causative trait for tolerance to Zn deficiency and better Zn retranslocation from shoot to root was a key attribute of Zn-efficient genotypes. |
format | Online Article Text |
id | pubmed-4815024 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-48150242016-04-08 Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice Nanda, Amrit K. Wissuwa, Matthias Front Plant Sci Plant Science Zinc (Zn) deficiency is one of the leading nutrient disorders in rice (Oryza sativa). Many studies have identified Zn-efficient rice genotypes, but causal mechanisms for Zn deficiency tolerance remain poorly understood. Here, we report a detailed study of the impact of Zn deficiency on crown root development of rice genotypes, differing in their tolerance to this stress. Zn deficiency delayed crown root development and plant biomass accumulation in both Zn-efficient and inefficient genotypes, with the effects being much stronger in the latter. Zn-efficient genotypes had developed new crown roots as early as 3 days after transplanting (DAT) to a Zn deficient field and that was followed by a significant increase in total biomass by 7 DAT. Zn-inefficient genotypes developed few new crown roots and did not increase biomass during the first 7 days following transplanting. This correlated with Zn-efficient genotypes retranslocating a higher proportion of shoot-Zn to their roots, compared to Zn-inefficient genotypes. These latter genotypes were furthermore not efficient in utilizing the limited Zn for root development. Histological analyses indicated no anomalies in crown tissue of Zn-efficient or inefficient genotypes that would have suggested crown root emergence was impeded. We therefore conclude that the rate of crown root initiation was differentially affected by Zn deficiency between genotypes. Rapid crown root development, following transplanting, was identified as a main causative trait for tolerance to Zn deficiency and better Zn retranslocation from shoot to root was a key attribute of Zn-efficient genotypes. Frontiers Media S.A. 2016-03-31 /pmc/articles/PMC4815024/ /pubmed/27066060 http://dx.doi.org/10.3389/fpls.2016.00428 Text en Copyright © 2016 Nanda and Wissuwa. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Plant Science Nanda, Amrit K. Wissuwa, Matthias Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice |
title | Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice |
title_full | Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice |
title_fullStr | Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice |
title_full_unstemmed | Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice |
title_short | Rapid Crown Root Development Confers Tolerance to Zinc Deficiency in Rice |
title_sort | rapid crown root development confers tolerance to zinc deficiency in rice |
topic | Plant Science |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4815024/ https://www.ncbi.nlm.nih.gov/pubmed/27066060 http://dx.doi.org/10.3389/fpls.2016.00428 |
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