Yiran Cheng, Yuanjiang He, Jia Chen, Weiping Li, Wenhui Xiang, Xing Chen, Dan Long, Jian Zeng, Yang Liu, Dongwei Wang, Dandan Wu, Lina Sha, Xing Fan, Haiqin Zhang, Houyang Kang, Yonghong Zhou, Yong Ren, Yi Wang
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引用次数: 0
Abstract
Aims
Wheat easily absorbs Cadmium (Cd) from soils and accumulates in its grains. Nitrogen (N) fertilizer management has been used to limit grain Cd concentrations in wheat, but the effects of compound fertilizers (NPK-N) are unclear.
Methods
Here, three years’ of field experiments were conducted to evaluate the effects of NPK-N on grain Cd concentration and yield of 50 wheat cultivars. A high-Cd accumulating cultivar Chuanmai 68 (CM68) and a low-Cd accumulating Mianmai 902 (MM902) were further used to reveal the physiological and molecular mechanisms of the Cd transport pathway.
Results
The results showed that NPK-N application significantly reduced grain Cd accumulation in all 50 wheat cultivars compared to amide N fertilize (urea-N) application. MM902 showed lower Cd uptake before anthesis, higher Cd export from plant during grain filling, and lower grain Cd concentration than CM68. Meanwhile, NPK-N application significantly reduced grain Cd concentration in CM68 (39.70%) and MM902 (35.12%), as well as Cd uptake, but promoted Cd export compared to urea-N. Besides, the expression levels of TaIRT1 (Iron Regulated Transporter 1) and TaCCX2 (Cation/Ca Exchanger 2) were associated with Cd uptake and export, respectively. Overexpression of TaIRT1 increased Cd uptake and grain Cd concentration in rice.
Conclusions
Our study showed that NPK-N application can limit grain Cd concentration and increase grain yield of wheat. The different grain Cd concentrations between CM68 and MM902 are mainly results from the different Cd uptake before anthesis and Cd export during grain filling. The results provide a theoretical basis for safe and high-quality wheat production by NPK-N application.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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