Zinc allocation and re-allocation in rice

Aims Agronomy and breeding actively search for options to enhance cereal grain Zn density. Quantifying internal (re-)allocation of Zn as affected by soil and crop management or genotype is crucial. We present experiments supporting the development of a conceptual model of whole plant Zn allocation a...

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Main Authors: Tjeerdjan eStomph, Wen eJiang, Peter van der Putten, Paul Christiaan Struik
Format: Article
Language:English
Published: Frontiers Media S.A. 2014-01-01
Series:Frontiers in Plant Science
Subjects:
Online Access:http://journal.frontiersin.org/Journal/10.3389/fpls.2014.00008/full
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spelling doaj-dd662aea40aa4c82aba3feeb2c7634d12020-11-24T23:57:06ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2014-01-01510.3389/fpls.2014.0000874235Zinc allocation and re-allocation in riceTjeerdjan eStomph0Wen eJiang1Peter van der Putten2Paul Christiaan Struik3Wageningen UniversityQingdao Agricultural UniversityWageningen UniversityWageningen UniversityAims Agronomy and breeding actively search for options to enhance cereal grain Zn density. Quantifying internal (re-)allocation of Zn as affected by soil and crop management or genotype is crucial. We present experiments supporting the development of a conceptual model of whole plant Zn allocation and re-allocation in rice. <br/>Methods Two solution culture experiments using 70Zn applications at different times during crop development and an experiment on within-grain distribution of Zn are reported. In addition, results from two earlier published experiments are re-analysed and re-interpreted. <br/>Results A budget analysis showed that plant zinc accumulation during grain filling was larger than zinc allocation to the grains. Isotope data showed that zinc taken up during grain filling was only partly transported directly to the grains and partly allocated to the leaves. Zinc taken up during grain filling and allocated to the leaves replaced zinc re-allocated from leaves to grains. Within the grains, no major transport barrier was observed between vascular tissue and endosperm. At low tissue Zn concentrations, rice plants maintained concentrations of about 20 mg Zn kg-1 dry matter in leaf blades and reproductive tissues, but let Zn concentrations in stems, sheath and roots drop below this level. When plant zinc concentrations increased, Zn levels in leaf blades and reproductive tissues only showed a moderate increase while Zn levels in stems, roots and sheath increased much more and in that order. <br/>Conclusions In rice, the major barrier to enhanced zinc allocation towards grains is between stem and reproductive tissues. Enhancing root to shoot transfer will not contribute proportionally to grain zinc enhancement.http://journal.frontiersin.org/Journal/10.3389/fpls.2014.00008/fullOryza sativaricestable isotope70Znzinc allocationre-allocation
collection DOAJ
language English
format Article
sources DOAJ
author Tjeerdjan eStomph
Wen eJiang
Peter van der Putten
Paul Christiaan Struik
spellingShingle Tjeerdjan eStomph
Wen eJiang
Peter van der Putten
Paul Christiaan Struik
Zinc allocation and re-allocation in rice
Frontiers in Plant Science
Oryza sativa
rice
stable isotope
70Zn
zinc allocation
re-allocation
author_facet Tjeerdjan eStomph
Wen eJiang
Peter van der Putten
Paul Christiaan Struik
author_sort Tjeerdjan eStomph
title Zinc allocation and re-allocation in rice
title_short Zinc allocation and re-allocation in rice
title_full Zinc allocation and re-allocation in rice
title_fullStr Zinc allocation and re-allocation in rice
title_full_unstemmed Zinc allocation and re-allocation in rice
title_sort zinc allocation and re-allocation in rice
publisher Frontiers Media S.A.
series Frontiers in Plant Science
issn 1664-462X
publishDate 2014-01-01
description Aims Agronomy and breeding actively search for options to enhance cereal grain Zn density. Quantifying internal (re-)allocation of Zn as affected by soil and crop management or genotype is crucial. We present experiments supporting the development of a conceptual model of whole plant Zn allocation and re-allocation in rice. <br/>Methods Two solution culture experiments using 70Zn applications at different times during crop development and an experiment on within-grain distribution of Zn are reported. In addition, results from two earlier published experiments are re-analysed and re-interpreted. <br/>Results A budget analysis showed that plant zinc accumulation during grain filling was larger than zinc allocation to the grains. Isotope data showed that zinc taken up during grain filling was only partly transported directly to the grains and partly allocated to the leaves. Zinc taken up during grain filling and allocated to the leaves replaced zinc re-allocated from leaves to grains. Within the grains, no major transport barrier was observed between vascular tissue and endosperm. At low tissue Zn concentrations, rice plants maintained concentrations of about 20 mg Zn kg-1 dry matter in leaf blades and reproductive tissues, but let Zn concentrations in stems, sheath and roots drop below this level. When plant zinc concentrations increased, Zn levels in leaf blades and reproductive tissues only showed a moderate increase while Zn levels in stems, roots and sheath increased much more and in that order. <br/>Conclusions In rice, the major barrier to enhanced zinc allocation towards grains is between stem and reproductive tissues. Enhancing root to shoot transfer will not contribute proportionally to grain zinc enhancement.
topic Oryza sativa
rice
stable isotope
70Zn
zinc allocation
re-allocation
url http://journal.frontiersin.org/Journal/10.3389/fpls.2014.00008/full
work_keys_str_mv AT tjeerdjanestomph zincallocationandreallocationinrice
AT wenejiang zincallocationandreallocationinrice
AT petervanderputten zincallocationandreallocationinrice
AT paulchristiaanstruik zincallocationandreallocationinrice
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