The relationships between nutrient availability and shoot branching inhibition by strigolactones

Strigolactones(SLS)是一种植物激素，可抑制枝条的分枝以及根际共生和寄生的通讯信号。然而，为什么SL既参与信息传递又参与植物激素作用，目前尚不清楚。在本研究中，野生型水稻幼苗的分蘖芽生长受到抑制，而根2‘-epi-5-deoxstrigol(epi-5ds)水平升高，这是对介质中PI浓度降低的反应，但在SL缺乏和不敏感的突变体中没有。这些结果表明，SL在磷缺乏的适应中起着重要作用

Strigolactones (SLs) function as a plant hormone that inhibits shoot branching as well as communication signals for symbiosis and parasitism in the rhizosphere. However, why SL contributes to both the communication signal and phytohormone action has been unknown. In this study, tiller bud outgrowth in wild-type rice seedlings is inhibited, while root 2'-epi-5-deoxystrigol (epi-5DS) levels are elevated, in response to decreasing Pi concentrations in the media, but not in the SL-deficient and -insensitive mutants. These results suggest that SL plays an important role in the adaptation to Pi deficiency