期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 22, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/ijms22168799
关键词
grapevine; root restriction; strigolactone; root architecture; gene expression
资金
- Shanghai Sailing Program [21YF1422100]
- Startup Fund for Young Faculty at SJTU [21X010500643]
- National Postdoctoral Program for Innovative Talents [BX20180199]
- China Postdoctoral Science Foundation [2018M642028]
- National Key Research and Development Plan program [2018YFD1000200]
The study revealed significant changes in grapevine root architecture and endogenous strigolactone content under root-restriction cultivation, with key roles played by VvCCD8 and VvD27 genes. Treatment with synthetic SL analog GR24 resulted in decreased root length, altered root diameter, and lateral root density.
This study investigated the effects of root-restriction cultivation on the root architecture, endogenous strigolactone (SL) content, and SL-related genes expression in grapevine (Vitis vinifera L.). In addition, we clarified the effects of synthetic SL analog GR24 application on grapevine roots to explore the role of SLs in their development. The results showed that the root architecture changed significantly under root-restriction cultivation. At 40 days after transplantation (DAT), the contents of two types of SLs in roots under root restriction were both significantly lower than that in roots of the control. SL content was significantly positively correlated with the expression levels of VvCCD8 and VvD27, indicating that they play vital roles in SLs synthesis. After GR24 treatment for 20 days, the root length was significantly shorter than in the control. A low concentration (0.1 mu M) of GR24 significantly reduced the root diameter and increased the fine-root density, while a high concentration (10 mu M) of GR24 significantly reduced the lateral root (LR) length and increased the LR density. Concomitantly, GR24 (0.1 mu M) reduced endogenous SL content. After GR24 treatment for 5 days, the total content of two tested SLs was highly positively correlated with the expression levels of VvDAD2, whereas it was highly negatively correlated with VvSMAXL4 at 20 days after GR24 treatment. This study helps to clarify the internal mechanism of root-restriction cultivation affecting the changes in grapevine root architecture, as well as further explore the important role of SLs in the growth of grapevine roots in response to root-restriction treatment.
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