A novel PGPR strain, Streptomyces lasalocidi JCM 3373T
发布日期:2025-01-18 12:06
来源:网络
作者:Liang Lu
浏览次数:175

该研究筛选到一株新的植物根际促生菌——拉沙里菌素链霉菌S. lasalocidi JCM 3373T,该菌能够通过分泌吲哚-3-甲醛(indole‐3‐carboxaldehyde, ICA1d)调控根系构型,进而提高大豆的耐盐性。该研究为开发新的根际促生微生物菌剂和盐碱地综合改良利用提供了新线索。
我国大豆产量长期严重不足,但耕地面积有限。因此有效利用边际土地(包括具有农业利用前景的1.85亿亩盐碱地)、提高大豆生产能力是解决大豆产量问题的重要办法。植物根际促生菌在改善利用盐碱地和提高作物产量方面具有广阔的应用前景。
该研究选择了36株来自不同环境的链霉菌进行大豆盐胁迫实验,结果显示大豆接种S. lasalocidi JCM 3373T后显著增强了耐盐性。通过对该菌进行荧光标记观察其与大豆根系的相互作用,结果提示S. lasalocidi JCM 3373T可能以分泌代谢产物的间接方式发挥作用。代谢产物分析表明,该菌发酵不同时间(3~7天)的粗提物中均含有ICA1d。深入研究发现,施加不同发酵时间的S. lasalocidi JCM 3373T粗提物和适当浓度的ICA1d均能有效增强大豆耐盐性。进一步研究显示, S. lasalocidi JCM 3373T粗提物和ICA1d能调控大豆根系构型,从而有利于缓解大豆盐胁迫。
https://doi.org/10.1111/pce.14847
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