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Cell autonomous and non-autonomous functions of plant intracellular immune receptors in stomatal defense and apoplastic defense

文献类型： 外文期刊

作者： Yan, Jiapei 1 ; Yu, Huiyun 1 ; Li, Bo 3 ; Fan, Anqi 1 ; Melkonian, Jeffrey 5 ; Wang, Xiue 4 ; Zhou, Tong 2 ; Hua, Jian 1 ;

作者机构： 1.Cornell Univ, Plant Biol Sect, Sch Integrat Plant Sci, Ithaca, NY 14853 USA

2.Jiangsu Acad Agr Sci, Inst Plant Protect, Key Lab Food Qual & Safety, Nanjing, Jiangsu, Peoples R China

3.Cornell Univ, Sch Appl Phys & Engn, Ithaca, NY USA

4.Nanjing Agr Univ, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing, Jiangsu, Peoples R China

5.Cornell Univ, Sch Integrat Plant Sci, Crop & Soil Sci, Ithaca, NY USA

期刊名称：PLOS PATHOGENS （ 影响因子：6.823； 五年影响因子：7.455 ）

ISSN： 1553-7366

年卷期： 2019 年 15 卷 10 期

页码：

收录情况： SCI

摘要： Stomatal closure defense and apoplastic defense are two major immunity mechanisms restricting the entry and propagation of microbe pathogens in plants. Surprisingly, activation of plant intracellular immune receptor NLR genes, while enhancing whole plant disease resistance, were sometimes linked to a defective stomatal defense in autoimmune mutants. Here we report the use of high temperature and genetic chimera to investigate the inter-dependence of stomatal and apoplastic defenses in autoimmunity. High temperature inhibits both stomatal and apoplastic defenses in the wild type, and it suppresses constitutive apoplastic defense responses and rescues the deficiency of stomatal closure response in autoimmune mutants. Chimeric plants have been generated to activate NLR only in guard cells or the non-guard cells. NLR activation in guard cells inhibits stomatal closure defense response in a cell autonomous manner likely through repressing ABA responses. At the same time, it leads to increased whole plant resistance accompanied by a slight increase in apoplastic defense. In addition, NLR activation in both guard and non-guard cells affects stomatal aperture and water potential. This study thus reveals that NLR activation has a differential effect on immunity in a cell type specific matter, which adds another layer of immune regulation with spatial information. Author summary Plant immunity against foliar pathogens consists of stomatal defense to restrict the entry of pathogens and apoplastic defense to restrict the propagation of pathogens. Plant intracellular immune receptor NLR genes are known to trigger apoplastic defense upon perception of pathogen effectors. In this study, we uncovered a previously unidentified inhibitory role of NLR activation in stomatal defense by using autoimmune mutants where NLR genes are activated without pathogen trigger. We further showed by chimera plants that NLR function is cell autonomous in guard cells for stomatal closure defense and non-cell autonomous for apoplastic defense. In addition, we revealed that high temperature slows down stomatal closure defense in addition to its known effect of inhibiting apoplastic defense. This study therefore reveals an unexpected regulation of stomatal defense by NLR genes and provides the spatial information of these regulations in stomatal defense and apoplastic defense.

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