Laboratory of Biological Oxidations, Department of Biochemistry, State University of Maringa, 87020900 Maringa, Brazil.
Department of Engineering and Exact Sciences, Federal University of Paraná, 85950000 Palotina, Brazil.
J Agric Food Chem. 2020 Mar 11;68(10):3006-3016. doi: 10.1021/acs.jafc.9b06304. Epub 2020 Feb 27.
An increase in crop competitiveness relative to weed interference has the potential to reduce crop yield losses. In this study, the effects of phytoalexin resveratrol were examined in L. (corn) and in the weed species (Dammer) O'Donell (morning glory). At a concentration range from 220 to 2200 μM resveratrol exerted a stimulus on seedling growth that was more pronounced at low concentrations; in the weed species , resveratrol exerted inhibitory action on seedling growth in all of the assayed concentration range. In , resveratrol also inhibited the respiratory activity of the primary roots. In mitochondria isolated from roots, resveratrol at concentrations above 440 μM inhibited the respiration coupled to ADP phosphorylation and the activities of NADH-oxidase, succinate-oxidase, and ATPsynthase. These effects were not reproduced in grown in the presence of resveratrol as the respiratory activities of the roots were not affected. The finding that the resveratrol exerts beneficial effects on growth of seedlings and inhibits the growth of heightens the potential of resveratrol application for crop protection.
作物相对于杂草干扰的竞争力增加有可能降低作物产量损失。在这项研究中，研究了植物抗毒素白藜芦醇对玉米和杂草旋花（牵牛）的影响。在 220 至 2200 μM 的浓度范围内，白藜芦醇对幼苗生长表现出刺激作用，在低浓度下更为明显；在杂草旋花中，白藜芦醇在所有测定的浓度范围内对幼苗生长均表现出抑制作用。在玉米中，白藜芦醇还抑制了初生根的呼吸活性。在从玉米根分离的线粒体中，浓度高于 440 μM 的白藜芦醇抑制了与 ADP 磷酸化偶联的呼吸作用以及 NADH-氧化酶、琥珀酸氧化酶和 ATP 合酶的活性。在有白藜芦醇存在的情况下生长的玉米中，这些作用没有重现，因为根的呼吸活性没有受到影响。白藜芦醇对玉米幼苗生长有益，对旋花生长有抑制作用，这提高了白藜芦醇在作物保护中的应用潜力。
