Vitalini Sara, Orlando Francesca, Vaglia Valentina, Bocchi Stefano, Iriti Marcello
Department of Agricultural and Environmental Sciences, Università degli Studi di Milano, 20133 Milan, Italy.
Department of Molecular and Translational Medicine (DMMT), Università degli Studi di Brescia, 25123 Brescia, Italy.
Plants (Basel). 2020 Mar 4;9(3):324. doi: 10.3390/plants9030324.
The phytotoxic relationships between crops and weeds can cover a role in weed management, reducing the use of chemical herbicides. Starting from the organic farmers' experience, the study aimed to define the inhibitory action of Lam., used as a cover crop before rice sowing, against (Ard.) Fritsch, one of the main rice weeds. In vitro 7-day assays were carried out in Petri dishes to compare the effect of different Lam. parts, in the form of aqueous extract or powder, on the seed germination and seedling growth of L. and and to verify the hypothesis of a higher susceptibility of the weed. The total polyphenolic content, as the potential source of allelochemicals, in the parts was measured. The results showed that both species suffer the phytotoxic action of , but a more marked effect against . was recorded. In according with the polyphenol quantities, stem and inflorescence extracts showed the more significant species-specific inhibition. In all assays, the weed showed a stronger reduction in the root length and seedling vigor index, and, in some cases, also in the germination percentage and shoot length compared to rice.
作物与杂草之间的植物毒性关系在杂草管理中发挥作用，可减少化学除草剂的使用。本研究从有机农户的经验出发，旨在确定水稻播种前用作覆盖作物的[植物名称1拉丁文]对水稻主要杂草之一[植物名称2拉丁文]的抑制作用。在培养皿中进行了为期7天的体外试验，以比较不同形式（水提取物或粉末）的[植物名称1拉丁文]各部分对[植物名称2拉丁文]和[植物名称3拉丁文]种子萌发和幼苗生长的影响，并验证杂草具有更高敏感性这一假设。测定了[植物名称1拉丁文]各部分中作为化感物质潜在来源的总多酚含量。结果表明，两个物种均受到[植物名称1拉丁文]的植物毒性作用，但对[植物名称2拉丁文]的作用更为显著。与多酚含量一致，茎和花序提取物表现出更显著的物种特异性抑制作用。在所有试验中，与水稻相比，杂草的根长和幼苗活力指数下降更为明显，在某些情况下，发芽率和地上部分长度也有所下降。
