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        1. 每日摘要:F‐box蛋白MAX2在苔蘚和維管植物中的功能分化

          植物類SCI摘要 2021-08-26 15:14:45

          五月
          27

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          Physcomitrella patens?MAX2 characterization suggests an ancient role for this F-box protein in photomorphogenesis rather than strigolactone signalling


          First author:?Mauricio Lopez‐Obando;?Affiliations:?Université Paris‐Saclay?(巴黎-薩克雷大學):?Versailles Cedex,?France

          Corresponding author:?Sandrine Bonhomme


          Strigolactones (SLs; 獨腳金內酯) are key hormonal regulators of flowering plant development and are widely distributed amongst streptophytes (鏈型植物). In?Arabidopsis, SLs signal via the F‐box protein MORE AXILLARY GROWTH2 (MAX2), affecting multiple aspects of development including shoot branching, root architecture and drought tolerance. Previous characterization of a?Physcomitrella patens?moss mutant with defective SL synthesis supports an ancient role for SLs in land plants, but the origin and evolution of signalling pathway components are unknown. Here we investigate the function of a moss homologue of MAX2, PpMAX2, and characterize its role in SL signalling pathway evolution by genetic analysis. We report that the moss?Ppmax2?mutant shows very distinct phenotypes from the moss SL‐deficient mutant. In addition, the?Ppmax2?mutant remains sensitive to SLs, showing a clear transcriptional SL response in dark conditions, and the response to red light is also altered. These data suggest divergent evolutionary trajectories for SL signalling pathway evolution in mosses and vascular plants. In?P. patens, the primary roles for MAX2 are in photomorphogenesis (光形態建成) and moss early development rather than in SL response, which may require other, as yet unidentified, factors.




          獨腳金內酯是調控開花植物發育重要激素,廣泛分布于鏈型植物中。在擬南芥中,獨腳金內酯信號由F‐box類蛋白MAX2調控,進而影響包括莖分枝、根結構及干旱抗性等在內的植物發育的許多方面。之前對于獨腳金內酯合成缺陷的小立碗蘚的研究揭示了獨腳金內酯在陸地植物中的古老作用,然而改信號通路組分的起源和演化仍然不清楚。本文,作者研究了小立碗蘚中MAX2同源蛋白PpMAX2的功能,并通過遺傳學分析鑒定了其在獨角金內酯信號通路演化中的作用。本文的研究顯示小立碗蘚Ppmax2突變體與獨腳金內酯缺陷突變體的表型有著明顯的差別。另外,Ppmax2突變體仍然對獨腳金內酯敏感,在黑暗條件下明顯表現出對于獨腳金內酯的轉錄響應,并且對于紅光的響應也有所改變。這些數據表明苔蘚和維管植物中的獨腳金內酯信號轉導通路演化有著明顯不同的演化軌跡。在小立碗蘚中,MAX2的主要作用更多的在于光形態建成和早期發育,而不是獨角金內酯響應,在小立碗蘚中參與獨角金內酯響應的可能是其他的某些為鑒定的因子。




          doi:?https://doi.org/10.1104/pp.18.00331


          Journal:?New Phytologist

          First Published date: 21 May,?2018


          (P.S. 原文下載:鏈接:https://pan.baidu.com/s/1qFiSsqwlF_7JjmGMbedfhQ??密碼:dmu6


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