Nitrogen represses haustoria formation through abscisic acid in the parasitic plant Phtheirospermum japonicum

第一作者：Anna Kokla

第一单位：瑞典农业科学大学

第一通讯：Charles W. Melnyk

 Abstarct 

背景回顾：Parasitic plants are globally prevalent pathogens that withdraw nutrients from their host plants using an organ known as the haustorium. The external environment including nutrient availability affects the extent of parasitism and to understand this phenomenon, we investigated the role of nutrients and found that nitrogen is sufficient to repress haustoria formation in the root parasite Phtheirospermum japonicum. 

寄生植物是一种在全球比较普遍存在的病原体，其通过吸器从寄主植物中获取养分。包括可利用养分等外部环境会影响寄生程度，为了理解这一现象，作者研究了养分的作用，发现氮就足以抑制根寄生植物松蒿（Phtheirospermum japonicum）的吸器形成。

结果-氮-ABA-吸器形成：Nitrogen increases levels of abscisic acid (ABA) in P. japonicum and prevents the activation of hundreds of genes including cell cycle and xylem development genes. Blocking ABA signaling overcomes nitrogen’s inhibitory effects indicating that nitrogen represses haustoria formation by increasing ABA. The effect of nitrogen appears more widespread since nitrogen also inhibits haustoria in the obligate root parasite Striga hermonthica. 

氮能够增加了松蒿体内的脱落酸（ABA）水平，并阻止了包括细胞周期和木质部发育相关基因等在内的数百个基因的激活。阻断ABA的信号转导能够克服氮对松蒿的抑制作用，表明氮通过增加ABA含量来抑制松蒿吸器的形成。进一步的研究发现，氮还能够抑制专性根寄生植物独脚金（Striga hermontica）的吸器形成，表明氮的作用似乎更加广泛。

结论：Together, our data show that nitrogen acts as a haustoria repressing factor and suggests a mechanism whereby parasitic plants use nitrogen availability in the external environment to regulate the extent of parasitism.

总之，本文的研究结果表明，氮作为寄生植物的吸器抑制因子发挥功能，揭示了一种寄生植物利用外部环境中的氮可用性来调节寄生程度的机制。

 Charles W. Melnyk 

doi: https://doi.org/10.1038/s41467-022-30550-x

Journal: Nature Communications

Published date: May 27, 2022

CITE

Anna Kokla, Martina Leso, Xiang Zhang, Jan Simura, Phanu T. Serivichyaswat, Songkui Cui, Karin Ljung, Satoko Yoshida, Charles W. Melnyk. Nitrogen represses haustoria formation through abscisic acid in the parasitic plant Phtheirospermum japonicum. Nature Communications, 2022, 13: 2976. DOI: https://doi.org/10.1038/s41467-022-30550-x