Cite this article: | 孙齐状,王龙,赵鹏,等.不同磷效率品种小麦对镉和铅吸收和积累的差异分析[J].灌溉排水学报,0,():-. |
| sunqihzunag,wanglong,zhaopeng,et al.不同磷效率品种小麦对镉和铅吸收和积累的差异分析[J].灌溉排水学报,0,():-. |
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DOI: |
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Differential Analysis in the Uptake and Accumulation of Cadmium and Lead by Wheat Varieties with Different Phosphorus Efficiency |
sunqihzunag1, wanglong2, zhaopeng1, huangshaomin3, xiaoyatao4, suifuqin1, qinshiyu1
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1.Henan Agricultural University;2.Henan Agricultural University,;3.Henan Academy of Agricultural Sciences;4.Institute of Farmland Irrigation of CAAS
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Abstract: |
【Objective】To determine the differences in the uptake, translocation and accumulation of phosphorus (P), cadmium (Cd) and lead (Pb) and their interrelationships by different P efficiency wheat varieties.【Method】A single-factor experiment of P, Cd and Pb was set up under indoor culture to analyze the uptake and translocation characteristics and their interrelationships by different phosphorus efficiency wheat varieties. Secondly, a randomized group experiment was conducted under field conditions in the moderately polluted area of Cd and Pb to further verify the differences in the accumulation of P, Cd and Pb by these wheat varieties.【Result】The average P content in the roots of HP varieties was 7.69 mg/g, significantly lower than that of LP varieties, which was 8.36 mg/g (P<0.05), while the average P content in the shoots of HP varieties was 9.73 mg/g, significantly higher than 8.19 mg/g (P<0.05) of the LP varieties, and the P transport coefficient of HP varieties was 1.45, significantly higher than that of the LP variety at 1.19 (P<0.05). The kinetic characteristics of Cd and Pb uptake by roots and shoots were well in accordance with Michaelis-Menten equation (R2>0.94), and their maximum absorption rates (Vmax) were significantly different among varieties (P<0.05). The Vmax of the HP variety roots for Cd and Pb was 23.9 μg/g/d and 411 μg/g/d, which was very significantly lower than that of the LP variety with 80.0 μg/g/d and 835 μg/g/d (P<0.01), while the Vmax of Cd and Pb in the shoots was largest for HP varieties (6.42 μg/g/d and 212 μg/g/d, respectively) and lowest for LP varieties (2.96 μg/g/d, 80.0 μg/g/d, respectively). Correlation analysis showed that both Cd and Pb transport coefficients were highly significantly negatively correlated with root P content (r=-0.638 and -0.714, respectively, P<0.01), while Cd transport coefficient was highly significantly positively correlated with P transport coefficient (r=0.671, P<0.01) and Pb transport coefficient was positively correlated with P transport coefficient but did not reach a significant level (r=0.391, P>0.05). It indicated that the increase of root P content helps to reduce the translocation of Cd and Pb to the shoot, while the increase in the translocation coefficient of P does not promote the translocation of Pb to the shoot, but significantly promotes the translocation of Cd.【Conclusion】The roots of LP varieties showed high uptake but low translocation of P, Cd and Pb, while HP varieties showed low uptake but high translocation of P, Cd and Pb. This suggests that LP varieties are more suitable for growing in soils with safe utilization levels of Cd and Pb. |
Key words: phosphorus efficiency; wheat; cadmium; lead; uptake characteristics |
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