來自北京生命科學研究所,農業(yè)大學的研究人員介紹了一種新的高通量的SAR篩選體系,以及這種方法在正向遺傳學中的應用。這一研究成果公布Plant Physiology雜志上。
系統(tǒng)獲得性抗性 (Systemic Acquired Resistance,SAR) 是指植物初次受到病原菌侵染后在沒有受侵害的葉片上產生的對病原菌的廣譜性抗性。長期以來一直缺少能直接針對SAR進行的正向遺傳學篩選方法。
張躍林實驗室建立了一種“涂和噴”的高通量的SAR篩選體系。這種“涂和噴”的實驗簡單方便,省時省力,可以應用在正向遺傳學中。用這個方法進行的大規(guī)模的正向遺傳學篩選篩到了若干已知的在植物**方面的突變體。包括6個fmo1突變體,4個ald1突變體,3個sid2突變體,1個pad4突變體和1個pbs3突變體。除此以外,還得到了一個CAMTA3的gain-of-function的突變體,他們將其命名為camta3-3D。camta3-3D表現(xiàn)出明顯的SAR缺陷,以及對**病原的顯著敏感性。CAMTA3過表達的株系也表現(xiàn)出對病原菌更加敏感的表型。這些都證明CAMTA3是一個在植物**中起到重要作用的負調節(jié)因子。
除此之外,今年年初張躍林實驗室發(fā)表了“MOS11: mRNA出核運輸中的一個新元件”文章,篩選到了擬南芥的先天**突變體snc1修飾子mos11,并揭示了mos11在mRNA出核運輸中的關鍵作用,從而為深入了解mRNA出核運輸分子機制提供了新思路,并有助于推動科研人員開發(fā)出mRNA出核異常所致**的新**策略。
原文摘要:
Brush and Spray: A high throughput systemic acquired resistance assay suitable for large-scale genetic screening
Beibei Jing,Shaohua Xu,Mo Xu,Yan Li,Shuxin Li,Jinmei Ding andYuelin Zhang
Systemic acquired resistance (SAR) is a defense mechanism induced in the distal parts of plants after primary infection. It confers long-lasting protection against a broad spectrum of microbial pathogens. Lack of high-throughput assays has hampered forward genetic analysis of SAR. Here we report the development of an easy and efficient assay for SAR and its application in a forward genetic screen for SAR-deficient mutants. Using the new assay for SAR, we identified six fmo1, four ald1, three sid2, one pad4 and one pbs3 alleles as well as a gain-of-function mutant of CAMTA3 designated camta3-3D. Like transgenic plants over-expressing CAMTA3, camta3-3D mutant plants exhibit compromised SAR and enhanced susceptibility to virulent pathogens, suggesting that CAMTA3 is a critical regulator of both basal resistance and SAR.