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Accumulation of copper in brown rice and effect of copper on rice growth and grain yield in different rice cultivars

机译：不同水稻品种糙米中铜的积累及其对水稻生长和籽粒产量的影响

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摘要

A pot experiment with 38 commonly cultured rice cultivars showed that the effect of Cu (100 mg kg~(-1)) on rice growth, grain yield and accumulation of Cu in brown rice varied greatly with different cultivars. Although the average Cu concentration in brown rice of the 38 cultivars was significantly increased (P < 0.01) compared with the control, in none of the cultivars did Cu concentration in brown rice exceed the maximum permissible limit of 10 mg Cu kg~(-1). This suggests that rice grown in Cu-contaminated paddy soil (100 mg Cu kg~(-1)) will not adversely affect human health through the food chain. Because of the significant negative correlation between grain weight and Cu concentration in brown rice with the soil Cu treatment, screening for cultivars with low Cu accumulation in brown rice and high grain yield for Cu-contaminated areas is feasible. The present research led to the recommendation of three such cultivars: Jiahua, Zhenxian 866, Zhe 733. The average grain yield under Cu treatment (100 mg Cu kg~(-1) soil) was significantly (P < 0.01) reduced compared with the control. The decreases or increases of grain yields mainly resulted from the combined effects of the panicles per pot, spikelets per panicle and filled spikelets per panicle under the soil Cu treatment. Furthermore, there were significant (r = 0.869, P < 0.01) positive correlations between the RC (relative changes) of spikelets per panicle and filled spikelets per panicle under the soil Cu treatment.
机译：通过对38个常用水稻品种的盆栽试验表明，Cu（100 mg kg〜（-1））对糙米中水稻生长，籽粒产量和Cu积累的影响随不同品种而有很大差异。尽管与对照相比，38个品种的糙米中平均Cu浓度显着增加（P <0.01），但在所有品种中，糙米中的Cu浓度均未超过最大允许限量10 mg Cu kg〜（-1）。 ）。这表明在铜污染的水稻土上种植的水稻（100 mg Cu kg〜（-1））不会通过食物链对人类健康产生不利影响。由于土壤铜处理使糙米中的粒重与铜含量之间存在显着的负相关关系，因此在糙米中筛选低铜积累和高Cu污染地区谷物产量的品种是可行的。本研究结果推荐了三个这样的品种：嘉化，镇县866，浙733。在Cu处理下（100 mg Cu kg〜（-1）土壤），平均籽粒产量明显低于（P <0.01）。控制。籽粒单产的降低或增加主要是由于土壤铜处理下每盆穗，每穗小穗和每穗实穗的综合影响。此外，在土壤铜处理下，每穗小穗的RC（相对变化）与每穗实心小穗的RC（相对变化）之间存在显着的正相关（r = 0.869，P <0.01）。

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