The Contribution of Zn Uptake and Grain Zn Loading Intensity to Achieving Zn Biofortification Breeding Targets in Rice
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| Názov: | The Contribution of Zn Uptake and Grain Zn Loading Intensity to Achieving Zn Biofortification Breeding Targets in Rice |
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| Autori: | Rakotondramanana, Mbolatantely, Stangoulis, James, Grenier, Cécile, Wissuwa, Matthias |
| Prispievatelia: | RIOU, Christine |
| Zdroj: | Journal of Plant Nutrition and Soil Science |
| Informácie o vydavateľovi: | Wiley, 2025. |
| Rok vydania: | 2025 |
| Predmety: | grain zinc, zinc translocation, [SDV.SA.STA] Life Sciences [q-bio]/Agricultural sciences/Sciences and technics of agriculture, Oryza sativa, fertilisation, genotypic variation, [SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants genetics, biomasse, zinc concentrations, essai de variété, grain, riz, [SDV.SA] Life Sciences [q-bio]/Agricultural sciences, variété, zinc, gene-bank accessions, légume racine, [SDV.BV.AP] Life Sciences [q-bio]/Vegetal Biology/Plant breeding, génotype, amélioration des plantes, expression des gènes |
| Popis: | BackgroundIncreasing Zinc (Zn) concentrations in rice grains is targeted in Zn‐biofortification breeding but most rice varieties have grain Zn concentrations far below breeding targets.AimsHigh‐Zn donors have been identified and our aim is to investigate whether higher grain Zn concentrations in these donors were the result of superior Zn uptake during the reproductive stage, of higher Zn loading intensities or caused by an extended Zn loading period.MethodsField experiments comparing two high‐Zn donors to two low‐Zn modern varieties were conducted over two seasons in Madagascar and tissue Zn concentrations and content determined from heading to maturity.ResultsZn uptake between heading and maturity was not limiting grain Zn concentrations. Neither did studied genotypes differ significantly in the duration of Zn loading, which peaked 8–12 days after flowering and strongly decreased thereafter, even in high‐Zn donors. Instead, the Zn loading intensity during grain filling differed with peak loading rates exceeding 60 ng Zn day−1 in high‐Zn donors compared to 13–37 ng Zn day−1 in low‐Zn varieties. This high Zn loading intensity was further evident when Zn and biomass grain loading rates were compared. Donor IRIS‐9368 loaded up to 40 ng Zn mg−1 grain biomass compared to 12–21 ng Zn mg−1 in low‐Zn varieties. This high loading intensity resulted in a zinc harvest index of 47.7% in IRIS‐9368 compared to 26.1% for local variety X265 despite similar reproductive‐stage Zn uptake.ConclusionsWe hypothesize that xylem‐to‐phloem transfer of Zn at upper nodes is more efficient in high‐Zn donor IRIS‐9368. |
| Druh dokumentu: | Article |
| Popis súboru: | text; application/pdf |
| Jazyk: | English |
| ISSN: | 1522-2624 1436-8730 |
| DOI: | 10.1002/jpln.12013 |
| Prístupová URL adresa: | http://agritrop.cirad.fr/613112/ https://hal.inrae.fr/hal-05058393v2 https://doi.org/10.1002/jpln.12013 https://hal.inrae.fr/hal-05058393v2/document |
| Rights: | CC BY |
| Prístupové číslo: | edsair.doi.dedup.....74f986b3ff11a5cda98a738da99e0919 |
| Databáza: | OpenAIRE |
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Nájsť tento článok vo Web of Science | Abstrakt: | BackgroundIncreasing Zinc (Zn) concentrations in rice grains is targeted in Zn‐biofortification breeding but most rice varieties have grain Zn concentrations far below breeding targets.AimsHigh‐Zn donors have been identified and our aim is to investigate whether higher grain Zn concentrations in these donors were the result of superior Zn uptake during the reproductive stage, of higher Zn loading intensities or caused by an extended Zn loading period.MethodsField experiments comparing two high‐Zn donors to two low‐Zn modern varieties were conducted over two seasons in Madagascar and tissue Zn concentrations and content determined from heading to maturity.ResultsZn uptake between heading and maturity was not limiting grain Zn concentrations. Neither did studied genotypes differ significantly in the duration of Zn loading, which peaked 8–12 days after flowering and strongly decreased thereafter, even in high‐Zn donors. Instead, the Zn loading intensity during grain filling differed with peak loading rates exceeding 60 ng Zn day−1 in high‐Zn donors compared to 13–37 ng Zn day−1 in low‐Zn varieties. This high Zn loading intensity was further evident when Zn and biomass grain loading rates were compared. Donor IRIS‐9368 loaded up to 40 ng Zn mg−1 grain biomass compared to 12–21 ng Zn mg−1 in low‐Zn varieties. This high loading intensity resulted in a zinc harvest index of 47.7% in IRIS‐9368 compared to 26.1% for local variety X265 despite similar reproductive‐stage Zn uptake.ConclusionsWe hypothesize that xylem‐to‐phloem transfer of Zn at upper nodes is more efficient in high‐Zn donor IRIS‐9368. |
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| ISSN: | 15222624 14368730 |
| DOI: | 10.1002/jpln.12013 |