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铵态氮和一氧化氮调节拟南芥 Ler/Kas-2 免疫相关杂种不亲和性的建立。

Ammonium and nitric oxide condition the establishment of Arabidopsis Ler/Kas-2 immune-related hybrid incompatibility.

机构信息

Department of Biology, Healthcare and Environment, Section of Plant Physiology, Faculty of Pharmacy and Food Sciences, Universitat de Barcelona, 08028, Barcelona, Spain.

出版信息

Planta. 2022 Sep 10;256(4):76. doi: 10.1007/s00425-022-03990-4.

DOI:10.1007/s00425-022-03990-4
PMID:36087170
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9464153/
Abstract

High ammonium suppresses hybrid incompatibility between Ler and Kas-2 accessions through lowering nitric oxide levels and nitrate reductase activity required for autoimmunity. The immune-related hybrid incompatibility (HI) between Landsberg erecta (Ler) and Kashmir-2 (Kas-2) accessions is due to a deleterious genetic interaction between the RPP1 (RECOGNITION OF PERONOSPORA PARASITICA1)-like Ler locus and Kas-2 alleles of the receptor-like kinase SRF3 (STRUBBELIG RECEPTOR FAMILY 3). The genetic incompatibility is temperature-dependent and leads to constitutive activation of the salicylic acid (SA) pathway, dwarfism and cell death at 14-16 °C. Here we investigated the effect of nutrition on the occurrence of Ler/Kas-2 HI and found that high ammonium suppresses Ler/Kas-2 incompatible phenotypes independently of the ammonium/nitrate ratio. Ammonium feeding leads to compromised disease resistance to Pseudomonas syringae pv. tomato DC3000, lower total SA, nitric oxide and nitrate reductase activity in Ler/Kas-2 incompatible hybrids. In addition, we find that Ler/Kas-2 incompatibility is dependent on NPR1 (NONEXPRESSER OF PR GENES 1) and nitric oxide production. Overall, this work highlights the effect of nutrition on the expression of incompatible phenotypes independently of temperature.

摘要

高浓度铵通过降低自身免疫所需的一氧化氮水平和硝酸还原酶活性来抑制 Ler 和 Kas-2 品系间的杂种不亲和性。Ler 和 Kashmir-2（Kas-2）品系间的与免疫相关的杂种不亲和性（HI）是由于 RPP1（识别霜霉病菌 1）样 Ler 基因座与 SRF3（STRUBBELIG 受体家族 3）受体样激酶 Kas-2 等位基因之间的有害遗传相互作用所致。这种遗传不兼容性依赖于温度，并导致在 14-16°C 时组成型激活水杨酸（SA）途径、矮化和细胞死亡。在这里，我们研究了营养对 Ler/Kas-2 HI 发生的影响，发现高浓度铵可独立于铵/硝酸盐比例抑制 Ler/Kas-2 不亲和表型。铵喂养会导致对丁香假单胞菌 pv.番茄 DC3000 的抗病性受损，在 Ler/Kas-2 不亲和杂种中总 SA、一氧化氮和硝酸还原酶活性降低。此外，我们发现 Ler/Kas-2 不亲和性依赖于 NPR1（非表达 PR 基因 1）和一氧化氮的产生。总的来说，这项工作强调了营养对不亲和表型表达的影响独立于温度。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd71/9464153/8a30226908f1/425_2022_3990_Fig8_HTML.jpg
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