| 曾涛,武永福,孟媛,张亮,李科,韩萍,姚志龙.水分管理配施锰肥对牡蛎壳粉调控水稻镉吸收的影响[J].农业环境科学学报,2024,43(5):1017-1028. |
| 水分管理配施锰肥对牡蛎壳粉调控水稻镉吸收的影响 |
| Effects of water management combined with manganese fertilizer on regulation of cadmium uptake by rice with application of oyster shell powder |
| 投稿时间：2023-11-13 |
| DOI：10.11654/jaes.2023-0956 |
| 中文关键词: 水稻 镉吸收转运 牡蛎壳粉 锰肥 |
| 英文关键词: rice Cd uptake and translocation oyster shell powder manganese fertilizer |
| 基金项目:陇东学院博士基金项目（XYBYZK2204）；国家自然科学基金青年科学基金项目（32001200） |
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| 中文摘要: |
| 为研究水分管理配施锰肥对牡蛎壳粉调控水稻Cd吸收转运的效果，采用盆栽试验，在两种水分管理（持续淹水、干湿交替）条件下，分析了水稻抽穗前后牡蛎壳粉配施不同用量硫酸锰肥（0、50、100 mg·kg-1）对根际土壤Cd、Mn形态及含量和水稻Cd、Mn含量分布以及水稻根系Cd吸收转运OsNramp5基因表达的影响。结果表明：单施牡蛎壳粉（OS处理）在两种水分条件下均显著降低了土壤有效态Cd和有效态Mn含量，在持续淹水条件下对糙米Cd含量没有显著影响，但在干湿交替条件下显著降低了糙米中Cd含量。在持续淹水条件下，与OS处理相比，牡蛎壳粉配施锰肥（OSMn处理）可使土壤有效态Mn含量显著增加5.4%~10.9%；OSMn处理根OsNramp5相对表达量上调85.6%~105.9%，促进了水稻对Cd的吸收；OSMn50处理铁膜、根和秸秆中Cd含量分别增加了46.9%、52.9%、33.7%，但秸秆-糙米中Cd的转移系数降低了47.8%，糙米中Cd含量降低了30.0%，随着Mn肥添加量增加，OSMn100处理铁膜-根、秸秆-糙米中Cd的转移量分别增加了35.3%、23.9%，糙米中Cd含量增加了25.2%。在干湿交替条件下，随着Mn肥添加量增加，OSMn处理土壤有效态Mn、土壤无定形和游离态Mn氧化物含量显著增加，而土壤有效态Cd含量逐渐降低；与OS处理相比，OSMn50处理根OsNramp5的相对表达量增加了256.8%~322.8%，显著增加了水稻不同部位Mn含量，但对糙米和根中Cd含量没有显著影响；OSMn100处理秸秆-糙米中Cd的转移系数增加了38.9%，水稻糙米中Cd含量增加了15.3%。研究表明，在持续淹水条件下，牡蛎壳粉配施50 mg·kg-1Mn肥可进一步降低水稻糙米中Cd含量，但过量配施Mn肥会促进水稻籽粒中Cd的累积，与干湿交替相比，牡蛎壳粉配施Mn肥在持续淹水条件下能更有效地降低糙米Cd累积。 |
| 英文摘要: |
| This study was conducted to study the effect of water management combined with Mn fertilizer on the regulation of Cd uptake and transport in rice. In this study, oyster shell powder was applied to a pot experiment under different water management conditions（continuous flooding and alternating flooding and drying）. The effects of oyster shell powder combined with different amounts of manganese sulfate fertilizer（0, 50, 100 mg·kg-1） on the morphology and content of Cd and Mn in rhizosphere soil, content of Cd and Mn in rice, and the expression of OsNramp5 gene in root were analyzed. The results showed that a single application of oyster shell powder（OS treatment） could significantly decrease soil available Cd and available Mn contents under both water management conditions. Under continuous flooding conditions, OS treatment had no significant effect on Cd content in brown rice, but significantly reduced Cd content in brown rice under alternating flooding and drying conditions compared with CK treatment. Under continuous flooding conditions, compared with OS treatment, oyster shell powder combined with manganese sulfate fertilizer（OSMn treatment） could significantly increase the soil available Mn content by 5.4%-10.9%. The relative expression of OsNramp5 in roots treated with OSMn was upregulated by 85.6%-105.9%, which promoted the absorption of Cd in rice. OSMn50 treatment increased the content of Cd in iron plaque, root and straw by 46.9%, 52.9%, and 33.7%, respectively, but decreased the transfer coefficient of Cd in straw-brown rice by 47.8% and the content of Cd in brown rice by 30.0%. The transfer coefficients of Cd in iron plaque-root and straw-brown rice were increased by 35.3% and 23.9%, respectively, and the content of Cd in brown rice increased by 25.2% when treated with OSMn100. Under alternating flooding and drying, OSMn treatment significantly increased the content of available Mn, amorphous, and free Mn oxides in soil, while the content of soil available Cd decreased gradually with the increase of Mn fertilizer addition. Compared with OS treatment, OSMn50 treatment up-regulated the relative expression of OsNramp5 in root by 256.8%-322.8%, which significantly increased Mn content in different parts of rice, but had no significant effect on Cd content in brown rice and root. The transfer coefficient of Cd in straw-brown rice increased by 38.9%, and the Cd content in straw-brown rice increased by 15.3% when treated with OSMn100. The above results showed that oyster shell powder combined with 50 mg·kg-1 Mn fertilizer further reduced the Cd content in brown rice, but excessive Mn fertilizer promoted the accumulation of Cd in rice grains under continuous flooding conditions. In addition, compared with alternate flooding and drying, oyster shell powder combined with Mn fertilizer was more effective in reducing the accumulation of Cd in brown rice under continuous flooding conditions. |
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