Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel.
Planta. 2011 Jan;233(1):209-16. doi: 10.1007/s00425-010-1310-y. Epub 2010 Nov 16.
Strigolactones (SLs) have been proposed as a new group of plant hormones, inhibiting shoot branching, and as signaling molecules for plant interactions. Here, we present evidence for effects of SLs on root development. The analysis of mutants flawed in SLs synthesis or signaling suggested that the absence of SLs enhances lateral root formation. In accordance, roots grown in the presence of GR24, a synthetic bioactive SL, showed reduced number of lateral roots in WT and in max3-11 and max4-1 mutants, deficient in SL synthesis. The GR24-induced reduction in lateral roots was not apparent in the SL signaling mutant max2-1. Moreover, GR24 led to increased root-hair length in WT and in max3-11 and max4-1 mutants, but not in max2-1. SLs effect on lateral root formation and root-hair elongation may suggest a role for SLs in the regulation of root development; perhaps, as a response to growth conditions.
独脚金内酯（SLs）被认为是一种新的植物激素，抑制侧芽分枝，并作为植物相互作用的信号分子。在这里，我们提供了 SLs 对根发育影响的证据。对 SLs 合成或信号转导缺陷突变体的分析表明，缺乏 SLs 会增强侧根的形成。相应地，在合成生物活性 SL GR24 的存在下生长的根在 WT 和 SL 合成缺陷的 max3-11 和 max4-1 突变体中显示出较少的侧根。在 SL 信号转导突变体 max2-1 中，GR24 诱导的侧根减少并不明显。此外，GR24 导致 WT 和 max3-11 和 max4-1 突变体的根毛长度增加，但在 max2-1 中则没有。SLs 对侧根形成和根毛伸长的影响可能表明 SLs 在调节根发育中的作用；也许，作为对生长条件的反应。
