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Combination of High Zn Density and Low Phytic Acid for Improving Zn Bioavailability in Rice ( Oryza stavia L.) Grain
Rice ( IF 5.5 ) Pub Date : 2021-02-27 , DOI: 10.1186/s12284-021-00465-0
Yin Wang , Yusha Meng , Yanping Ma , Lei Liu , Dianxing Wu , Xiaoli Shu , Liqing Pan , Qixian Lai

Background

Zn deficiency is one of the leading public health problems in the world. Staple food crop, such as rice, cannot provide enough Zn to meet the daily dietary requirement because Zn in grain would chelate with phytic acid, which resulted in low Zn bioavailability. Breeding new rice varieties with high Zn bioavailability will be an effective, economic and sustainable strategy to alleviate human Zn deficiency.

Results

The high Zn density mutant LLZ was crossed with the low phytic acid mutant Os-lpa-XS110–1, and the contents of Zn and phytic acid in the brown rice were determined for the resulting progenies grown at different sites. Among the hybrid progenies, the double mutant always displayed significantly higher Zn content and lower phytic acid content in grain, leading to the lowest molar ratio of phytic acid to Zn under all environments. As assessed by in vitro digestion/Caco-2 cell model, the double mutant contained the relatively high content of bioavailable Zn in brown rice.

Conclusions

Our findings suggested pyramiding breeding by a combination of high Zn density and low phytic acid is a practical and useful approach to improve Zn bioavailability in rice grain.



中文翻译:

高锌密度和低植酸组合提高水稻(Zn)生物利用度

背景

锌缺乏是世界上主要的公共卫生问题之一。大米等主要粮食作物无法提供足够的锌以满足日常饮食需求,因为谷物中的锌会与植酸螯合,导致锌的生物利用度低。选育具有高锌生物利用度的水稻新品种将是减轻人类锌缺乏的有效,经济和可持续的策略。

结果

高锌密度突变体LLZ与低植酸突变体Os-lpa-XS110-1杂交,并测定了糙米中锌和植酸的含量,以了解在不同位点生长的后代。在杂种后代中,双突变体始终显示出谷物中较高的锌含量和较低的植酸含量,从而导致在所有环境下植酸与锌的摩尔比最低。通过体外消化/ Caco-2细胞模型评估,该双突变体包含糙米中相对较高的可生物利用的Zn含量。

结论

我们的研究结果表明,通过高锌密度和低植酸的组合进行金字塔育种是提高水稻籽粒锌生物利用度的实用方法。

更新日期:2021-02-28
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