Suitable stocking density of fish in paddy field contributes positively to 2‐acetyl‐1‐pyrroline synthesis in grain and improves rice quality

作者：Qi Wang, Meijuan Li, Jiaen Zhang, Ziqiang Liu, Kai Yang, Hong‐ru Li, Mingzhu Luo · 发表于：Journal of the Science of Food and Agriculture · 年份：2023 · DOI：10.1002/jsfa.12597 · 被引用次数：7 · 研究领域：GABA and Rice Research、Rice Cultivation and Yield Improvement、Agricultural Systems and Practices

BACKGROUND: Fragrant rice is increasingly popular with the public owing to its fresh aroma, and 2-acetyl-1-pyrroline (2-AP) is the main characteristic component of the aroma in fragrant rice. Rice-fish co-culture is an environmentally friendly practice in sustainable agriculture. However, the effect of rice-fish co-culture on 2-AP in grains has received little study. A conventional fragrant rice (Meixiangzhan 2) was used, and a related field experiment during three rice growing seasons was conducted to investigate the effects of rice-fish co-culture on 2-AP, as well as the rice quality, yield, plant nutrients, and precursors and enzyme activities of 2-AP biosynthesis in leaves. This study involved three fish stocking density treatments (i.e. 9000 (D1), 15 000 (D2), and 21 000 (D3) fish fries per hectare) and rice monocropping. RESULTS: Rice-fish co-culture increased the 2-AP content in grains by 2.5-49.4% over that of the monocropping, with significant increases in the early and late rice seasons of 2020. Rice-fish co-culture treatments significantly promoted seed-setting rates by 3.39-7.65%, and improved leaf nutrients and rice quality. Notably, the D2 treatment significantly increased leaf total nitrogen (TN), total phosphorus (TP), and total potassium (TK) contents and the head rice rate at maturity stage, while significantly decreased chalkiness degree. There was no significant difference in rice yield. CONCLUSION: . © 2023 Society of Chemical Industry.