Rice Science ›› 2022, Vol. 29 ›› Issue (2): 189-196.DOI: 10.1016/j.rsci.2022.01.007

• Research Paper • Previous Articles    

Epoxiconazole Improved Photosynthesis, Yield Formation, Grain Quality and 2-Acetyl-1-Pyrroline Biosynthesis of Fragrant Rice

Luo Haowen1,2,3, He Longxin1,2,3, Du Bin1,2,3, Pan Shenggang1,2,3, Mo Zhaowen1,2,3, Yang Shuying4, Zou Yingbin4, Tang Xiangru1,2,3()   

  1. 1State Key Laboratory for Conservation and Utilization of Subtropical Agricultural Bioresources, South China Agricultural University, Guangzhou 510642, China
    2Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
    3Guangzhou Key Laboratory for Science and Technology of Aromatic Rice, Guangzhou 510642, China
    4College of Agronomy, Hunan Agricultural University, Changsha 410128, China
  • Received:2021-05-07 Accepted:2021-08-02 Online:2022-03-28 Published:2022-02-09
  • Contact: Tang Xiangru


Epoxiconazole is a triazole compound. However, the effects of epoxiconazole on crop productivity and quality were rarely reported. In this study, we investigated the effects of epoxiconazole application on yield formation, grain quality attributes, and 2-acetyl-1-pyrroline (2-AP) content in fragrant rice. A three-year field experiment was carried out with a fragrant rice variety, Meixiangzhan 2. At the heading stage, 0, 0.02, 0.04, 0.08, 0.16 and 0.32 g/L epoxiconazole solutions were foliar applied to fragrant rice plants, respectively. The results showed that epoxiconazole application significantly increased grain yield, seed-setting rate and 1000-grain weight. Chlorophyll content and net photosynthetic rate of fragrant rice during the grain-filling stage significantly increased due to epoxiconazole application. Foliar application of epoxiconazole at 0.08 g/L increased grain protein content and decreased both chalky rice rate and chalkiness area ratio of fragrant rice. Epoxiconazole also substantially increased grain 2-AP content by inducing the regulation in contents of related synthetic precursors, including proline, pyrroline-5- carboxylic acid, ∆1-pyrroline and methylglyoxal. Overall, foliar application of epoxiconazole could be used for the improvement in grain yield, grain quality and 2-AP content in fragrant rice production when applied concentration at 0.08-0.32 g/L. Our findings provided the new roles of epoxiconazole in crop production.

Key words: epoxiconazole, fragrant rice, 2-acetyl-1-pyrroline, yield formation, grain quality