NLR locus-mediated trade-off between abiotic and biotic stress adaptation in Arabidopsis
NLR locus-mediated trade-off between abiotic and biotic stress adaptation in Arabidopsis
复制标题
DOI：
10.1038/nplants.2017.72
复制
发表时间：
2017-06-01
期刊：
影响因子：
18
通讯作者：
Taji, Teruaki
中科院分区：
文献类型：
--
作者：
Ariga, Hirotaka;Katori, Taku;Taji, Teruaki
由干旱、盐或寒冷引起的渗透胁迫降低了植物的适合度。获得的胁迫耐受性定义了植物在初始胁迫后承受胁迫的能力1。我们以前发现，获得耐盐胁迫后的拟南芥加入2之间是普遍的。在此，我们确定ACQOS为获得性渗透压耐受的位点。在其五种单倍型中，只有携带第1组ACQOS的植物在获得性耐药性方面受损。ACQOS与VICTR相同，编码核苷酸结合富含亮氨酸重复序列（NLR）蛋白3。在不存在渗透胁迫的情况下，组1 ACQOS有助于细菌抗性。在其存在下，ACQOS会引起有害的自身免疫，从而降低抗氧化剂耐受性。在ACQOS基因座的自然变异的分析表明，功能和非功能ACQOS等位基因被保持由于生物和非生物胁迫适应之间的权衡。因此，在某些植物NLR基因的多态性可能会受到竞争性环境压力。
Osmotic stress caused by drought, salt or cold decreases plant fitness. Acquired stress tolerance defines the ability of plants to withstand stress following an initial exposure1. We found previously that acquired osmotolerance after salt stress is widespread among Arabidopsis thaliana accessions2. Here, we identify ACQOS as the locus responsible for ACQUIRED OSMOTOLERANCE. Of its five haplotypes, only plants carrying group 1 ACQOS are impaired in acquired osmotolerance. ACQOS is identical to VICTR, encoding a nucleotide-binding leucine-rich repeat (NLR) protein3. In the absence of osmotic stress, group 1 ACQOS contributes to bacterial resistance. In its presence, ACQOS causes detrimental autoimmunity, thereby reducing osmotolerance. Analysis of natural variation at the ACQOS locus suggests that functional and non-functional ACQOS alleles are being maintained due to a trade-off between biotic and abiotic stress adaptation. Thus, polymorphism in certain plant NLR genes might be influenced by competing environmental stresses.