Mbolatantely Rakotondramanana, James Stangoulis, Cécile Grenier, Matthias Wissuwa
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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<sup>−1</sup> in high-Zn donors compared to 13–37 ng Zn day<sup>−1</sup> 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<sup>−1</sup> grain biomass compared to 12–21 ng Zn mg<sup>−1</sup> 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.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>We hypothesize that xylem-to-phloem transfer of Zn at upper nodes is more efficient in high-Zn donor IRIS-9368.</p>\n </section>\n </div>","PeriodicalId":16802,"journal":{"name":"Journal of Plant Nutrition and Soil Science","volume":"188 4","pages":"639-649"},"PeriodicalIF":2.8000,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jpln.12013","citationCount":"0","resultStr":"{\"title\":\"The Contribution of Zn Uptake and Grain Zn Loading Intensity to Achieving Zn Biofortification Breeding Targets in Rice\",\"authors\":\"Mbolatantely Rakotondramanana, James Stangoulis, Cécile Grenier, Matthias Wissuwa\",\"doi\":\"10.1002/jpln.12013\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Background</h3>\\n \\n <p>Increasing Zinc (Zn) concentrations in rice grains is targeted in Zn-biofortification breeding but most rice varieties have grain Zn concentrations far below breeding targets.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Aims</h3>\\n \\n <p>High-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.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>Field 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.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>Zn 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<sup>−1</sup> in high-Zn donors compared to 13–37 ng Zn day<sup>−1</sup> 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<sup>−1</sup> grain biomass compared to 12–21 ng Zn mg<sup>−1</sup> in low-Zn varieties. 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引用次数: 0
摘要
背景提高水稻籽粒锌含量是锌生物强化育种的目标,但大多数水稻品种籽粒锌含量远低于育种目标。高锌供体已经确定,我们的目的是研究这些供体中较高的籽粒锌浓度是由于生殖阶段锌吸收较好、锌负荷强度较高还是由于锌负荷期延长所致。方法对两个高锌供体和两个低锌现代品种在马达加斯加进行了两个季节的田间试验,测定了抽穗至成熟期的组织锌浓度和含量。结果抽穗至成熟期的锌吸收不限制籽粒锌浓度。研究的基因型在锌负荷持续时间上也没有显著差异,开花后8-12天达到峰值,此后急剧下降,即使在高锌供体中也是如此。相反,灌浆过程中锌的加载强度不同,高锌供体的峰值加载率超过60 ng Zn d - 1,而低锌品种的峰值加载率为13 ~ 37 ng Zn d - 1。当比较Zn和生物量籽粒加载速率时,这种高Zn加载强度进一步明显。供体IRIS-9368的生物量可达40 ng Zn mg - 1,而低锌品种的生物量为12-21 ng Zn mg - 1。这种高负荷强度导致IRIS-9368的锌收获指数为47.7%,而本地品种X265的锌收获指数为26.1%。结论高锌供体IRIS-9368的上节木质部向韧皮部的锌转移效率更高。
The Contribution of Zn Uptake and Grain Zn Loading Intensity to Achieving Zn Biofortification Breeding Targets in Rice
Background
Increasing Zinc (Zn) concentrations in rice grains is targeted in Zn-biofortification breeding but most rice varieties have grain Zn concentrations far below breeding targets.
Aims
High-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.
Methods
Field 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.
Results
Zn 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.
Conclusions
We hypothesize that xylem-to-phloem transfer of Zn at upper nodes is more efficient in high-Zn donor IRIS-9368.
期刊介绍:
Established in 1922, the Journal of Plant Nutrition and Soil Science (JPNSS) is an international peer-reviewed journal devoted to cover the entire spectrum of plant nutrition and soil science from different scale units, e.g. agroecosystem to natural systems. With its wide scope and focus on soil-plant interactions, JPNSS is one of the leading journals on this topic. Articles in JPNSS include reviews, high-standard original papers, and short communications and represent challenging research of international significance. The Journal of Plant Nutrition and Soil Science is one of the world’s oldest journals. You can trust in a peer-reviewed journal that has been established in the plant and soil science community for almost 100 years.
Journal of Plant Nutrition and Soil Science (ISSN 1436-8730) is published in six volumes per year, by the German Societies of Plant Nutrition (DGP) and Soil Science (DBG). Furthermore, the Journal of Plant Nutrition and Soil Science (JPNSS) is a Cooperating Journal of the International Union of Soil Science (IUSS). The journal is produced by Wiley-VCH.
Topical Divisions of the Journal of Plant Nutrition and Soil Science that are receiving increasing attention are:
JPNSS – Topical Divisions
Special timely focus in interdisciplinarity:
- sustainability & critical zone science.
Soil-Plant Interactions:
- rhizosphere science & soil ecology
- pollutant cycling & plant-soil protection
- land use & climate change.
Soil Science:
- soil chemistry & soil physics
- soil biology & biogeochemistry
- soil genesis & mineralogy.
Plant Nutrition:
- plant nutritional physiology
- nutrient dynamics & soil fertility
- ecophysiological aspects of plant nutrition.