Cheah Boon Huat, Chuang Wen-Po, Lo Jing-Chi, Li Yi, Cheng Chih-Yun, Yang Zhi-Wei, Liao Chung-Ta, Lin Ya-Fen
Department of Agronomy, National Taiwan University, Taipei 10617, Taiwan.
Department of Horticulture and Biotechnology, Chinese Culture University, Taipei 11114, Taiwan.
Plants (Basel). 2022 Apr 19;11(9):1104. doi: 10.3390/plants11091104.
Metals that accumulate in plants may confer protection against herbivorous insects, a phenomenon known as elemental defense. However, this strategy has not been widely explored in important crops such as rice ( L.), where it could help to reduce the use of chemical pesticides. Here, we investigated the potential of copper (Cu) and iron (Fe) micronutrient supplements for the protection of rice against a major insect pest, the rice leaffolder (). We found that intermediate levels of Cu (20 μM CuSO) and high concentrations of Fe (742 μM Fe) did not inhibit the growth of larvae but did inhibit rice root growth and reduce grain yield at the reproductive stage. In contrast, high levels of Cu (80 μM CuSO) inhibited larval growth and pupal development but also adversely affected rice growth at the vegetative stage. Interestingly, treatment with 10 μM CuSO had no adverse effects on rice growth or yield components at the reproductive stage. These data suggest that pest management based on the application of Cu may be possible, which would be achieved by a higher effective pesticide dose to prevent or minimize its phytotoxicity effects in plants.
在植物中积累的金属可能会赋予植物抵御食草昆虫的能力，这一现象被称为元素防御。然而，在水稻等重要作物中，这种策略尚未得到广泛探索，而在水稻中它可能有助于减少化学农药的使用。在此，我们研究了补充微量营养元素铜（Cu）和铁（Fe）对水稻抵御主要害虫稻纵卷叶螟的潜力。我们发现，中等水平的铜（20 μM硫酸铜）和高浓度的铁（742 μM铁）不会抑制稻纵卷叶螟幼虫的生长，但会抑制水稻根系生长并降低生殖阶段的谷物产量。相比之下，高水平的铜（80 μM硫酸铜）会抑制稻纵卷叶螟幼虫生长和蛹的发育，但在营养生长阶段也会对水稻生长产生不利影响。有趣的是，用10 μM硫酸铜处理对生殖阶段的水稻生长或产量构成没有不利影响。这些数据表明，基于施用铜的害虫管理可能是可行的，这可以通过更高的有效农药剂量来实现，以防止或最小化其对植物的植物毒性影响。
