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McHale, Leah K.; Tan, Xiaoping; Koehl, Patrice; Michelmore, Richard W.

doi:10.1186/gb-2006-7-4-212

Cited by 812 publications

(354 citation statements)

References 97 publications

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“…The estimates of selection intensity by K a /K s ranged from 0.580 to 0.691, indicating that a purifying selection was acted on in the Rrs2 region. This finding is consistent with the selection pattern observed for NBS regions of other R genes (McHale et al 2006;Ribas et al 2011).…”

Section: Evolution In the Rrs2 Regionsupporting

confidence: 91%

Population-based resequencing analysis of wild and cultivated barley revealed weak domestication signal of selection and bottleneck in theRrs2scald resistance gene region

2012

Genome

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Many plant disease resistance (R) genes have been cloned, but the potential of utilizing these plant R-gene genomic resources for genetic inferences of plant domestication history remains unexplored. A population-based resequencing analysis of the genomic region near the Rrs2 scald resistance gene was made in 51 accessions of wild and cultivated barley from 41 countries. Fifteen primer pairs were designed to sample the genomic region with a total length of 10 406 bp. More nucleotide diversity was found in wild (π = 0.01846) than cultivated (π = 0.01507) barley samples. Three distinct groups of 29 haplotypes were detected for all 51 samples, and they were well mixed with wild and cultivated barley samples from different countries and regions. The neutrality tests by Tajima's D were not significant, but a significant (P < 0.05) case by Fu and Li's D* and F* was found in the barley cultivar samples. The estimate of selection intensity by K(a)/K(s) was 0.691 in wild barley and 0.580 in cultivated barley. The estimate of the minimum recombination events was 16 in wild barley and 19 in cultivated barley. A coalescence simulation revealed a bottleneck intensity of 1.5 to 2 since barley domestication. Together, the domestication signal in the genomic region was weak both in human selection and domestication bottleneck.

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Section: Evolution In the Rrs2 Regionsupporting

confidence: 91%

Population-based resequencing analysis of wild and cultivated barley revealed weak domestication signal of selection and bottleneck in theRrs2scald resistance gene region

2012

Genome

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“…NBS-LRR proteins are capable of recognizing a wide variety of pathogens and initiate a hypersensitive response (HR), resulting in cell death. The NBS-LRR proteins are divided in two major groups, involved in downstream specificity and signaling regulation [80], both of them showing high levels of expression in the Pp04. The behavior of NBS-LRR proteins through the different time point comparisons pointed out one more difference between the early and the late phase of response and a possible reason why the early response is not effective.…”

Section: Late Responses To Infection Seem To Be Involved In the Mitigmentioning

confidence: 99%

Expression Profiling in Pinus pinaster in Response to Infection with the Pine Wood Nematode Bursaphelenchus xylophilus

Gaspar

Trindade

Usié

et al. 2017

Forests

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Abstract:Forests are essential resources on a global scale, not only for the ecological benefits, but also for economical and landscape purposes. However, in recent years, a large number of forest species have suffered a serious decline, with maritime pine being one of the most affected. In Portugal, the maritime pine forest has been devastated by the pine wood nematode (PWN), the causal agent of pine wilt disease. In this study, RNA-Seq data was used to characterize the maritime pine response to infection with PWN, by determining the differentially expressed genes and identifying the regulatory networks and pathways associated. The analyses showed clear differences between an early response that occurs immediately after inoculation and a late response that is observed seven days after inoculation. Moreover, differentially expressed genes related to secondary metabolism, oxidative stress and defense against pathogen infection were identified over different time points. These results provide new insights about the molecular mechanisms and metabolic pathways involved in the response of Pinus pinaster against PWN infection, which will be a useful resource in follow-up studies and for future breeding programs to select plants with lower susceptibility to this disease.

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“…PTI is elicited by highly conserved microbe-associated molecular pattern molecules (MAMPs), such as bacterial flagellin or fungal chitin. ETI is generally elicited by pathogen-encoded virulence effectors that are recognized directly or indirectly by cytoplasmic nucleotide-binding site–leucine-rich repeat (NBS-LRR) receptors, referred to generically as Nod-like receptors or NLRs (Belkhadir et al, 2004; McHale et al, 2006; Nimchuk et al, 2003). Biochemical, pharmacological, and genetic approaches have been used to implicate both nicotinamide adenine dinucleotide phosphate (NADPH) oxidases and apoplastic peroxidases as the source of reactive oxygen species (ROS) (Bindschedler et al, 2006; Bolwell et al, 2002; Grant et al, 2000; Torres et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Apoplastic peroxidases are required for salicylic acid-mediated defense against Pseudomonas syringae

Mammarella

Cheng

et al. 2015

Phytochemistry

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Reactive oxygen species (ROS) generated by NADPH oxidases or apoplastic peroxidases play an important role in the plant defense response. Diminished expression of at least two Arabidopsis thaliana peroxidase encoding genes, PRX33 (At3g49110) and PRX34 (At3g49120), as a consequence of anti-sense expression of a heterologous French bean peroxidase gene (asFBP1.1), were previously shown to result in reduced levels of ROS following pathogen attack, enhanced susceptibility to a variety of bacterial and fungal pathogens, and reduced levels of callose production and defense-related gene expression in response to the microbe associated molecular pattern (MAMP) molecules flg22 and elf26. These data demonstrated that the peroxidase-dependent oxidative burst plays an important role in the elicitation of pattern-triggered immunity (PTI). Further work reported in this paper, however, shows that asFBP1.1 antisense plants are not impaired in all PTI-associated responses. For example, some but not all flg22-elicited genes are induced to lower levels by flg22 in asFPB1.1, and callose deposition in asFPB1.1 is similar to wild-type following infiltration with a Pseudomonas syringae hrcC mutant or with non-host P. syringae pathovars. Moreover, asFPB1.1 plants did not exhibit any apparent defect in their ability to mount a hypersensitive response (HR). On the other hand, salicylic acid (SA)-mediated activation of PR1 was dramatically impaired in asFPB1.1 plants. In addition, P. syringae-elicited expression of many genes known to be SA-dependent was significantly reduced in asFBP1.1 plants. Consistent with this latter result, in asFBP1.1 plants the key regulator of SA-mediated responses, NPR1, showed both dramatically decreased total protein abundance and a failure to monomerize, which is required for its translocation into the nucleus.

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Untitled

Cited by 812 publications

References 97 publications

Population-based resequencing analysis of wild and cultivated barley revealed weak domestication signal of selection and bottleneck in theRrs2scald resistance gene region

Population-based resequencing analysis of wild and cultivated barley revealed weak domestication signal of selection and bottleneck in theRrs2scald resistance gene region

Expression Profiling in Pinus pinaster in Response to Infection with the Pine Wood Nematode Bursaphelenchus xylophilus

Apoplastic peroxidases are required for salicylic acid-mediated defense against Pseudomonas syringae

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