油菜素内酯诱导小白菜初生根不对称生长

油菜素内酯（Brassinolide,BL）能诱导单子叶植物初生根发生不对称生长,而在双子叶植物中还未见报道。本试验通过外源施加不同浓度2,4-表油菜素内酯（2,4-Epibrassinolide,2,4-eBL）观察小白菜（Brassica chinensis L.）初生根生长状况。结果表明：2,4-eBL能诱导小白菜初生根发生不对称生长形成卷曲。随着2,4-eBL浓度的升高,根卷曲比例和曲率逐渐增大,同时向地性逐渐降低。试验发现外源施加2,4-eBL可诱导双子叶植物根不对称生长的现象,为研究油菜素甾醇（Brassinosteroids,BRs）在根生长发育中的作用提供新途径。

Brassinosteroid Induces Asymmetric Growth of Primary Roots in Brassica chinensis L.

Brassinolide (BL) can induce asymmetric growth of primary roots of monocots, but has not been reported in dicots. The text used the seedlings of Brassica chinensis L. as the experimental materials to observe the growth of primary root by exogenous application of different concentrations of 2,4-epibrassinolide (2,4-eBL). The results showed that 2,4-eBL could induce asymmetric growth of the primary root of B. chinensis L. to form curls, while the curling ratio and curvature of the root growth gradually increased. For the first time, the test found that the external application of 2,4-eBL induced the asymmetric root growth of dicotyledonous plants, and provided a new way to study the role of Brassinosteroids (BRs) in root growth and development.