Cui Baoling, Luo Haowen, Yao Xiangbin, Xing Pipeng, Deng Sicheng, Zhang Qianqian, Yi Wentao, Gu Qichang, Peng Ligong, Yu Xianghai, Zuo Changjian, Wang Jingjing, Wang Yangbo, Tang Xiangru
State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou 510642, China.
Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China.
Plants (Basel). 2024 Aug 14;13(16):2253. doi: 10.3390/plants13162253.
Cadmium (Cd) pollution restricts the rice growth and poses a threat to human health. Nanosized selenium (NanoSe) is a new nano material. However, the effects of NanoSe application on aromatic rice performances under Cd pollution have not been reported. In this study, a pot experiment was conducted with two aromatic rice varieties and a soil Cd concentration of 30 mg/kg. Five NanoSe treatments were applied at distinct growth stages: (T1) at the initial panicle stage, (T2) at the heading stage, (T3) at the grain-filling stage, (T1+2) at both the panicle initial and heading stages, and (T1+3) at both the panicle initial and grain-filling stages. A control group (CK) was maintained without any application of Se. The results showed that, compared with CK, the T1+2 and T1+3 treatments significantly reduced the grain Cd content. All NanoSe treatments increased the grain Se content. The grain number per panicle, 1000-grain weight, and grain yield significantly increased due to NanoSe application under Cd pollution. The highest yield was recorded in T3 and T1+3 treatments. Compared with CK, all NanoSe treatments increased the grain 2-acetyl-1-pyrroline (2-AP) content and impacted the content of pyrroline-5-carboxylic acid and 1-pyrroline which are the precursors in 2-AP biosynthesis. In conclusion, the foliar application of NanoSe significantly reduced the Cd content, increased the Se content, and improved the grain yield and 2-AP content of aromatic rice. The best amendment was applying NanoSe at both the panicle initial and grain-filling stages.
镉（Cd）污染会抑制水稻生长，并对人类健康构成威胁。纳米硒（NanoSe）是一种新型纳米材料。然而，关于在镉污染条件下施用纳米硒对香稻性能的影响尚未见报道。本研究采用两个香稻品种，土壤镉浓度为30 mg/kg进行盆栽试验。在不同生长阶段设置了5种纳米硒处理：（T1）在始穗期，（T2）在抽穗期，（T3）在灌浆期，（T1+2）在始穗期和抽穗期，（T1+3）在始穗期和灌浆期。设置不施用硒的对照组（CK）。结果表明，与CK相比，T1+2和T1+3处理显著降低了籽粒镉含量。所有纳米硒处理均提高了籽粒硒含量。在镉污染条件下，施用纳米硒显著增加了每穗粒数、千粒重和籽粒产量。T3和T1+3处理的产量最高。与CK相比，所有纳米硒处理均提高了籽粒2-乙酰-1-吡咯啉（2-AP）含量，并影响了2-AP生物合成前体吡咯啉-5-羧酸和1-吡咯啉的含量。综上所述，叶面喷施纳米硒显著降低了镉含量，提高了硒含量，改善了香稻的籽粒产量和2-AP含量。最佳处理方式是在始穗期和灌浆期均施用纳米硒。
