Division of Nematology, ICAR-Indian Agricultural Research Institute, New Delhi, India.
Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India.
J Environ Sci Health B. 2021;56(9):801-808. doi: 10.1080/03601234.2021.1956249. Epub 2021 Jul 31.
A series of chalcones () were synthesized, characterized (using IR and 1H NMR techniques), and evaluated with an objective to manage rice root-knot nematode (RRKN) () both under pluronic gel and field conditions. Out of these fourteen compounds, 1-(4-fluoro-phenyl)-3-phenyl-propenone () and 1,3-diphenyl-propenone () showed promising and dose dependent activity at 10, 20, and 40 mg L. A significant reduction in penetration of second stage juveniles (Js) in rice roots was observed in compounds (9.5-12.0 Js/plant) and (10.5-13.4 Js/plant) compared to control plants (PB1121) (13.5-23.6 Js/plant) in pluronic gel study. The results of field trials indicated that , showed significantly ( ≤ 0.05) better plant growth on 28 days after sowing (DAS) compared to . Both and reduced gall formation significantly than carbofuran 3 G @1 kg a.i./ha. However, lower concentrations were less effective in field in reducing the gall formation. Also, a significant reduction in the number of galls was observed when soil was drenched with @ 40 mg L. However, root dipping was not as effective as soil drenching. The study revealed that both the chalcones have the potential for effective management of RRKN in fields, and can be a better alternative to carbofuran.
合成了一系列查耳酮化合物，通过红外光谱（IR）和 1H 核磁共振（1H NMR）技术对其进行了表征，并进行了评价，旨在通过普朗尼克凝胶和田间条件来防治水稻根结线虫（RRKN）。在这 14 种化合物中，1-（4-氟苯基）-3-苯基丙烯酮（）和 1,3-二苯基丙烯酮（）在 10、20 和 40 mg/L 时表现出有希望的、剂量依赖性的活性。在普朗尼克凝胶研究中，化合物 （9.5-12.0 Js/plant）和 （10.5-13.4 Js/plant）与对照植物（PB1121）（13.5-23.6 Js/plant）相比，显著减少了第二阶段幼虫（J）在水稻根系中的穿透。田间试验结果表明，与对照药剂相比，化合物 和 在播种后 28 天（DAS）显著（≤0.05）提高了植物生长。与 3G 克百威 @1 公斤有效成分/公顷相比，化合物 和 都显著减少了根瘤的形成。然而，在田间条件下，较低的浓度在减少根瘤形成方面效果较差。当用 40mg/L 的溶液对土壤进行淋灌时，还观察到根结数量显著减少。然而，根浸处理不如土壤淋灌有效。该研究表明，两种查尔酮化合物都有可能有效地防治田间 RRKN，可以作为克百威的替代品。
