Raw data: Grain Zn concentrations and yields of Zn-biofortified and Zn-efficient rice genotypes under contrasting growth conditions

The data sets reveal grain Zn biofortfication performance of Zn-efficient and Zn-biofortified rice genotypes grown in different seasons in contrasting soils. Specifically, This study investigated grain yields and grain Zn concentrations of Zn-biofortified rice genotypes compared with Zn-efficient and -inefficient genotypes in field experiments in the Philippines in four contrasting paddy soils: one Zn-sufficient and three Zn-deficient with deficiency associated with (1) strongly reducing conditions and high soil organic C content; (2) high soil pH and presence of free calcium carbonate; and (3) strongly-weathered soil. In wet season 2012, results revealed that Zn-biofortified genotypes achieved both grain yield (4.0 t ha-1) and grain Zn concentration (30 mg kg-1) targets compared with Zn-efficient, Check and Zn-inefficient genotypes when grown under Zn-sufficient conditions (IRRI soils). Conversely, when grown in Zn-deficient soils (Bohol and Bukidnon), only the Zn-biofortified genotypes were able to achieve, or come close to, the Zn concentration requirement but not the yield target. Zn fertilization during the wet season 2014 significantly improved grain Zn concentration in Zn deficient soils but not the grain yield suggesting that grain yield was limited by other soil constraints rather than Zn deficiency. Further, results from two seasons in Zn-sufficient IRRI soils revealed that only the Zn fertilized rice genotypes were able to achieve the Zn biofortification target during the wet season, while during dry season, regardless of Zn treatments (no Zn and plus Zn), grain Zn levels were all above the threshold. This suggests that Zn fertilization should be given more importance during the wet season than the dry season particularly in soils with adequate levels of Zn that could become readily available to plants as a result of greater oxidation. Location of experiment: Bay, Bukidon, Bohol and IRRI Years/Season: 2012-2015/ Wet and Dry seasons

本数据集揭示了不同季节种植于不同类型土壤中的耐锌（Zn-efficient）水稻基因型与锌生物强化型（Zn-biofortified）水稻基因型的籽粒锌生物强化表现。具体而言，本研究在菲律宾的4种差异化稻田土壤中开展田间试验，对比分析了锌生物强化型水稻基因型与耐锌、不耐锌（Zn-inefficient）水稻基因型的籽粒产量及籽粒锌浓度；4种土壤分别为1种锌充足型土壤与3种锌缺乏型土壤：(1) 伴随强还原环境与高土壤有机碳含量的锌缺乏土壤；(2) 高pH且含游离碳酸钙的锌缺乏土壤；(3) 强风化型锌缺乏土壤。
2012年湿季试验结果显示，在国际水稻研究所（IRRI）的锌充足试验田土壤中，锌生物强化型水稻基因型的籽粒产量（4.0 t·ha⁻¹）与籽粒锌浓度（30 mg·kg⁻¹）均达到目标值，表现优于耐锌基因型、对照（Check）基因型与不耐锌基因型。反之，在波荷（Bohol）与布基农（Bukidnon）的锌缺乏土壤中种植时，仅锌生物强化型水稻基因型能够达到或接近籽粒锌浓度要求，但未能达成产量目标。
2014年湿季施加锌肥可显著提升锌缺乏土壤中水稻的籽粒锌浓度，但对籽粒产量无明显改善，这表明籽粒产量受限的原因并非锌缺乏，而是其他土壤限制因子。进一步对国际水稻研究所（IRRI）锌充足土壤开展的两季试验结果表明，仅施加锌肥的水稻基因型可在湿季达成锌生物强化目标；而在旱季，无论是否施加锌肥（不施锌与施锌处理），籽粒锌浓度均高于阈值。这提示，相较于旱季，湿季更应重视锌肥施用，尤其在因氧化作用增强而使植物可快速利用有效锌的充足锌土壤中。
试验地点：Bay、布基农（Bukidnon）、波荷（Bohol）及国际水稻研究所（IRRI）；试验年份与季别：2012-2015年，湿季与旱季。