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独脚金内酯通过与其他激素信号通路相互作用来调节樱桃砧木的茎长和茎直径。

Strigolactones modulate stem length and diameter of cherry rootstocks through interaction with other hormone signaling pathways.

作者信息

Liu Xunju, Xu Yan, Sun Wanxia, Wang Jiyuan, Gao Yixin, Wang Lei, Xu Wenping, Wang Shiping, Jiu Songtao, Zhang Caixi

机构信息

Department of Plant Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China.

出版信息

Front Plant Sci. 2023 Feb 9;14:1092654. doi: 10.3389/fpls.2023.1092654. eCollection 2023.

DOI:10.3389/fpls.2023.1092654
PMID:36844087
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9948674/
Abstract

Stem growth and development has considerable effects on plant architecture and yield performance. Strigolactones (SLs) modulate shoot branching and root architecture in plants. However, the molecular mechanisms underlying SLs regulate cherry rootstocks stem growth and development remain unclear. Our studies showed that the synthetic SL analog rac-GR24 and the biosynthetic inhibitor TIS108 affected stem length and diameter, aboveground weight, and chlorophyll content. The stem length of cherry rootstocks following TIS108 treatment reached a maximum value of 6.97 cm, which was much higher than that following rac-GR24 treatments at 30 days after treatment. Stem paraffin section showed that SLs affected cell size. A total of 1936, 743, and 1656 differentially expressed genes (DEGs) were observed in stems treated with 10 μM rac-GR24, 0.1 μM rac-GR24, and 10 μM TIS108, respectively. RNA-seq results highlighted several DEGs, including , , , , and , which play vital roles in stem growth and development. UPLC-3Q-MS analysis revealed that SL analogs and inhibitors affected the levels of several hormones in the stems. The endogenous GA content of stems increased significantly with 0.1 μM rac-GR24 or 10 μM TIS108 treatment, which is consistent with changes in the stem length following the same treatments. This study demonstrated that SLs affected stem growth of cherry rootstocks by changing other endogenous hormone levels. These results provide a solid theoretical basis for using SLs to modulate plant height and achieve sweet cherry dwarfing and high-density cultivation.

摘要

茎的生长和发育对植物形态和产量表现有相当大的影响。独脚金内酯（SLs）可调节植物的地上部分枝和根系结构。然而，SLs调控樱桃砧木茎生长和发育的分子机制仍不清楚。我们的研究表明，合成的SL类似物rac-GR24和生物合成抑制剂TIS108影响茎的长度、直径、地上部重量和叶绿素含量。处理30天后，TIS108处理的樱桃砧木茎长度达到最大值6.97厘米，远高于rac-GR24处理的茎长度。茎石蜡切片显示，SLs影响细胞大小。在分别用10 μM rac-GR24、0.1 μM rac-GR24和10 μM TIS108处理的茎中，分别观察到1936、743和1656个差异表达基因（DEGs）。RNA测序结果突出了几个DEGs，包括 、 、 、 和 ，它们在茎的生长和发育中起着至关重要的作用。超高效液相色谱-三重四极杆质谱联用（UPLC-3Q-MS）分析表明，SL类似物和抑制剂影响茎中几种激素的水平。0.1 μM rac-GR24或10 μM TIS108处理后，茎中的内源赤霉素（GA）含量显著增加，这与相同处理后茎长度的变化一致。本研究表明，SLs通过改变其他内源激素水平影响樱桃砧木的茎生长。这些结果为利用SLs调节株高、实现甜樱桃矮化和高密度栽培提供了坚实的理论基础。

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