植物通過亮氨酸富集重複受體樣激酶感知醌
作者:
小柯機器人發布時間:2020/9/4 16:10:49
日本理化研究所Ken Shirasu團隊發現,植物通過亮氨酸富集重複受體樣激酶感知醌。這一研究成果於2020年9月2日在線發表在《自然》上。
研究人員表示,醌在生活的所有生物界中產生並被感知。植物是醌的主要生產者,但是醌在植物中作為信號傳導劑的作用仍然未知。醌的一個已知作用是在寄生於根中的植物中誘導吸根(特殊的進食結構),這在宿主來源的醌化合物2,6-二甲氧基-1,4-苯醌(DMBQ)存在下發生,但是,尚不清楚寄生植物如何感測DMBQ,以及非寄生植物是否能夠感測醌。
研究人員使用擬南芥和DMBQ作為模式植物和醌,發現DMBQ信號通過提高胞質Ca2+濃度而在擬南芥中發生。研究人員在擬南芥中進行了正向遺傳篩選,從而分離了對DMBQ無反應的突變體,研究人員將其命名為card1 (cannot respond to DMBQ 1)。CARD1(At5g49760,也稱為HPCA1)基因編碼一種亮氨酸富集重複受體樣激酶,在陸地植物中高度保守。在擬南芥中,DMBQ觸發與防禦相關的基因表達,而card1突變體顯示出對細菌病原體的免疫受損。在松蒿(Phosirospermum japonicum,一種寄生根的植物)中,DMBQ會在根中啟動Ca2+信號傳導,並且對於吸根的發育非常重要。
此外,這種寄生植物的CARD1同源物在card1突變體中回補了DMBQ誘導的胞質Ca2+濃度升高。這些結果表明,與動物和細菌不同,植物使用富含亮氨酸的重複受體樣激酶來傳遞醌信號。這項工作提供了對醌信號和CARD1功能在植物中作用的見解,並有助於人們更好地了解寄生植物在形成吸根期間以及非寄生植物在植物免疫中所使用的信號傳導途徑。
附:英文原文
Title: Quinone perception in plants via leucine-rich-repeat receptor-like kinases
Author: Anuphon Laohavisit, Takanori Wakatake, Nobuaki Ishihama, Hugh Mulvey, Kaori Takizawa, Takamasa Suzuki, Ken Shirasu
Issue&Volume: 2020-09-02
Abstract: Quinones are produced and sensed in all kingdoms of life1,2,3,4. Plants are primary producers of quinone1,2, but the role of quinone as a signalling agent in plants remains largely unknown. One well-documented role of quinone is in the induction of haustoria (specialized feeding structures) in plants that parasitize roots, which occurs in the presence of the host-derived quinone compound 2,6-dimethoxy-1,4-benzoquinone (DMBQ)5. However, how parasitic plants sense DMBQ remains unclear, as is whether nonparasitic plants are capable of sensing quinones. Here we use Arabidopsis thaliana and DMBQ as a model plant and quinone to show that DMBQ signalling occurs in Arabidopsis via elevation of cytosolic Ca2+ concentration. We performed a forward genetic screen in Arabidopsis that isolated DMBQ-unresponsive mutants, which we named cannot respond to DMBQ 1 (card1). The CANNOT RESPOND TO DMBQ 1 (CARD1; At5g49760, also known as HPCA1) gene encodes a leucine-rich-repeat receptor-like kinase that is highly conserved in land plants. In Arabidopsis, DMBQ triggers defence-related gene expression, and card1 mutants show impaired immunity against bacterial pathogens. In Phtheirospermum japonicum (a plant that parasitizes roots), DMBQ initiates Ca2+ signalling in the root and is important for the development of the haustorium. Furthermore, CARD1 homologues from this parasitic plant complement DMBQ-induced elevation of cytosolic Ca2+ concentration in the card1 mutant. Our results demonstrate that plants—unlike animals and bacteria—use leucine-rich-repeat receptor-like kinases for quinone signalling. This work provides insights into the role of quinone signalling and CARD1 functions in plants that help us to better understand the signalling pathways used during the formation of the haustorium in parasitic plants and in plant immunity in nonparasitic plants.
DOI: 10.1038/s41586-020-2655-4
Source: https://www.nature.com/articles/s41586-020-2655-4