Song Jiaping, Liu Xiaodong, Wang Zhangmin, Zhang Zezhou, Chen Qingqing, Lin Zhi-Qing, Yuan Linxi, Yin Xuebin
School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China.
Jiangsu Bio-Engineering Research Center for Selenium/Advanced Lab for Functional Agriculture, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, China.
Front Plant Sci. 2022 May 11;13:889459. doi: 10.3389/fpls.2022.889459. eCollection 2022.
Crop biofortification with inorganic selenium (Se) fertilizer is a feasible strategy to improve the health of residents in Se-deficient areas. For eco-friendly crop Se biofortification, a comprehensive understanding of the effects of Se on crop and soil nematodes is vital. In this study, a rice pot experiment was carried out to test how selenite supply (untreated control (0), 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 100, or 200 mg Se kg) in soil affected rice growth, rice Se accumulation, and soil nematode abundance and composition. The results showed that selenite supply (5-200 mg kg) generally increased the number of rice tillers, rice yield, and Se concentrations in rice grains. In soil under 10 mg kg Se treatment, the genus composition of nematodes changed significantly compared with that in the control soil. With increased Se level (> 10 mg kg), soil nematode abundance decreased significantly. Correlation analysis also demonstrated the positive relationships between soil Se concentrations (total Se and bioavailable Se) with rice plant parameters (number of rice tillers, rice yield, and grain Se concentration) and negative relationships between soil Se concentrations (total Se and bioavailable Se) with soil nematode indexes (nematode abundance and relative abundance of ). This study provides insight into balancing Se biofortification of rice and soil nematode community protection and suggests the effective concentrations for total Se (1.45 mg kg) and bioavailable Se (0.21 mg kg) to soil nematode abundances at 20% level (EC20) as soil Se thresholds. At Se concentrations below these thresholds, rice plant growth and Se accumulation in the grain will still be promoted, but the disturbance of the soil nematodes would be negligible.
使用无机硒肥料对作物进行生物强化是改善缺硒地区居民健康的一种可行策略。对于生态友好型作物硒生物强化而言，全面了解硒对作物和土壤线虫的影响至关重要。本研究进行了一项水稻盆栽试验，以测试土壤中不同亚硒酸盐供应量（未处理对照（0）、5、10、15、20、25、30、35、40、45、50、100或200 mg Se kg）如何影响水稻生长、水稻硒积累以及土壤线虫丰度和组成。结果表明，亚硒酸盐供应（5 - 200 mg kg）总体上增加了水稻分蘖数、水稻产量和水稻籽粒中的硒浓度。在10 mg kg硒处理的土壤中，线虫的属组成与对照土壤相比有显著变化。随着硒水平升高（> 10 mg kg），土壤线虫丰度显著降低。相关性分析还表明，土壤硒浓度（总硒和生物可利用硒）与水稻植株参数（水稻分蘖数、水稻产量和籽粒硒浓度）之间呈正相关，与土壤线虫指标（线虫丰度和相对丰度）之间呈负相关。本研究为平衡水稻硒生物强化和土壤线虫群落保护提供了见解，并提出了土壤总硒（1.45 mg kg）和生物可利用硒（0.21 mg kg）在20%水平（EC20）下对土壤线虫丰度的有效浓度作为土壤硒阈值。在这些阈值以下的硒浓度下，水稻植株生长和籽粒中的硒积累仍将得到促进，但对土壤线虫的干扰可以忽略不计。
