Salicylic acid in Populus tomentosa is a remote signalling molecule induced by Botryosphaeria dothidea infection.
Salicylic acid in Populus tomentosa is a remote signalling molecule induced by Botryosphaeria dothidea infection.
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DOI：
10.1038/s41598-018-32204-9
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发表时间：
2018-09-19
影响因子：
4.6
通讯作者：
Zhang XY
中科院分区：
文献类型：
--
作者：
Li YX;Zhang W;Dong HX;Liu ZY;Ma J;Zhang XY
水杨酸（SA）在未感染植物组织局部暴露于病原体后系统获得抗性（SAR）的建立过程中起着关键作用。在这里，我们研究了SA在毛白杨感染植物病原体葡萄座腔菌dothidea。水杨酸和水杨酸甲酯（梅萨）在毛白杨体内的积累按时间顺序进行。SA和梅萨含量在感染部位高于未感染部位。此外，基因表达分析表明，SA可能被苯丙氨酸解氨酶（PAL）积累，并通过SA羧甲基转移酶（SAMT）转化为梅萨，而梅萨可能通过SA结合蛋白2（SABP 2）转化为SA。SAMT在感染部位和SABP 2在未感染部位的表达分别显著上调。因此，SA可能在感染部位转化为梅萨，并作为信号分子转运至未感染部位，在未感染部位转化为SA用于SAR。此外，B还上调了毛白杨病程相关基因PR-1、PR-2和PR-5的表达。dothidea感染。我们的研究确定，SA和梅萨含量的变化发生在感染和未感染的网站在白杨病原体感染后，有助于白杨SAR的远程信号。
The salicylic acid (SA) plays a critical role during the establishment of systemic acquired resistance (SAR) in uninfected plant tissues after localised exposure to a pathogen. Here, we studied SA in Populus tomentosa infected by the plant pathogen Botryosphaeria dothidea. The accumulation of SA and methyl salicylate (MeSA) occurred in chronological order in P. tomentosa. The SA and MeSA contents were greater at infected than uninfected sites. Additionally, a gene expression analysis indicated that SA might be accumulated by phenylalanine ammonialyase (PAL) and converted to MeSA by SA carboxyl methyltransferase (SAMT), while MeSA might convert to SA by SA-binding protein 2 (SABP2). The expressions of SAMT at infected sites and SABP2 at uninfected sites, respectively, were significantly up-regulated. Thus, SA might be converted to MeSA at infected sites and transported as a signalling molecule to uninfected sites, where it is converted to SA for SAR. Moreover, the expressions of pathogenesis-related genes PR-1, PR-2 and PR-5 in P. tomentosa were up-regulated by the B. dothidea infection. Our study determined that variations in SA and MeSA contents occur at infected and uninfected sites in poplar after pathogen infection and contributed to the remote signals for poplar SAR.
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