Inhibitory effects of redroot pigweed and crabgrass on switchgrass germination and growth-from lab to field

文献类型： 外文期刊

第一作者： Hou, Xincun

作者： Hou, Xincun;Yue, Yuesen;Guo, Qiang;Zhao, Chunqiao;Fan, Xifeng;Wu, Juying;Hu, Xu

作者机构：

关键词： Allelopathy; Redroot pigweed; Crabgrass; Weed; Switchgrass; Biomass

期刊名称：PLANT ECOLOGY （ 影响因子：1.859； 五年影响因子：2.196 ）

ISSN： 1385-0237

年卷期： 2021 年 222 卷 11 期

页码：

收录情况： SCI

摘要： Interactions between weeds and crops often occur by resource competition or allelopathy. However, it is still unknown how local weed species influence artificially introduced switchgrass. In this study, four experiments were conducted to evaluate the inhibitory effects of redroot pigweed (Amaranthus retroflexus) and crabgrass (Digitaria sanguinalis) on germination and growth of the lowland tetraploid switchgrass cultivar 'Alamo' (Panicum virgatum cv. Alamo). Switchgrass germination was significantly inhibited in Petri dishes, with 48.1% and 33.9% inhibitions on germination rate by redroot pigweed and crabgrass root aqueous extracts, respectively, at 0.1 g mL(-1) concentration. Significant inhibitory effects on switchgrass seedling biomass were observed at 5:5 ratio with redroot pigweed and crabgrass in glass jars, with 61.6% and 53.4% inhibitions on plant biomass, respectively. Under the same root segregation, redroot pigweed had a stronger inhibitory effect on switchgrass seedling growth than crabgrass. Growth of transplanted switchgrass seedlings was significantly inhibited by local weeds in the field, with 46.2% and 11.7% inhibitions on shoot biomass during the first and second growing seasons, respectively. However, no significant growth reduction in switchgrass was detected in the third growing season. These findings further our understanding of weed-crop interactions and could help develop weeds management strategies with ecological security.

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