College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, China.
PLoS One. 2013;8(3):e59715. doi: 10.1371/journal.pone.0059715. Epub 2013 Mar 27.
Sunflower broomrape is a noxious parasitic weed which has caused severe damage to crop ecosystems. Trap crops can release a mixture of allelochemicals to induce the germination of sunflower broomrape. We studied the allelopathic effects of soybean on sunflower broomrape. Fourteen common soybean cultivars were grown in pots. Samples were collected from soybean plants and rhizosphere soil at five growth stages (V1, V3, V5, R2, and R4). The allelopathic effects of soybean reached highest at the V3 stage. Methanolic extracts of soybean roots induced higher broomrape germination than methanolic extracts of stems or leaves. The germination rates induced by root extracts (10-fold dilution) were positively correlated with germination rates induced by stem (10-fold dilution) and leaf extracts (10-fold dilution). The broomrape germination rates induced by root extracts were also positively correlated with soybean nodule diameter and dry weight. The results indicated that soybeans could induce sunflower broomrape germination. We conclude that soybean has the potential to be used as a trap crop for sunflower broomrape.
向日葵列当是一种有害的寄生杂草，对作物生态系统造成了严重破坏。诱捕作物可以释放出混合物的化感物质来诱导向日葵列当的萌发。我们研究了大豆对向日葵列当的化感作用。14 个常见的大豆品种在盆中生长。在五个生长阶段（V1、V3、V5、R2 和 R4）从大豆植株和根际土壤中采集样品。大豆的化感作用在 V3 阶段达到最高。大豆根的甲醇提取物比茎或叶的甲醇提取物诱导更高的列当萌发。根提取物（10 倍稀释）诱导的萌发率与茎（10 倍稀释）和叶提取物（10 倍稀释）诱导的萌发率呈正相关。根提取物诱导的列当萌发率也与大豆根瘤直径和干重呈正相关。结果表明，大豆可以诱导向日葵列当的萌发。我们得出结论，大豆有可能被用作向日葵列当的诱捕作物。
