Growth, Development and Yield of Infected and Infested Plants and Crops

Walters, Dale R.

doi:10.1002/9781118783054.ch2

Cited by 3 publications

References 57 publications

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Boosting photosynthetic machinery and defense priming with chitosan application on tomato plants infected withFusarium oxysporumf. sp.lycopersici

Carmona

Villarreal-Navarrete

Burbano-David

et al. 2020

Preprint

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Physiological processes of plants infected by vascular pathogens are mainly affected by vascular bundle obstruction, decreasing the absorption of water and nutrients and gas exchange by stomatal closure, and inducing oxidative cascades and PSII alterations. Chitosan, a derivative of chitin present in the cell wall of some organisms including fungi, induces plant defense responses, activating systemic resistance. In this study, the effect of chitosan on the physiological and molecular responses of tomato plants infected with Fusarium oxysporum f. sp. lycopersici (Fol) was studied, evaluating the maximum potential quantum efficiency of PSII photochemistry (Fv/Fm), photochemical efficiency of PSII (Y(II)), photochemical quenching (qP), stomatal conductance (gs), relative water content (RWC), proline content, photosynthetic pigments, dry mass, and differential gene expression (PAL, LOXA, ERF1, and PR1) of defense markers. A reduction of 70% in the incidence and 91% in the severity of the disease was achieved in plants treated with chitosan, mitigating the damage caused by Fol on Fv/Fm, Y(II), and chlorophyll contents by 23%, 36%, and 47%, respectively. Less impact was observed on qP, gs, RWC, and dry mass (16%, 11%, and 26%, respectively). Chitosan-treated and Fol-infected plants over-expressed PR1a gene suggesting a priming-associated response. These results demonstrate the high potential of chitosan to protect tomato plants against Fol by regulating physiological and molecular responses in tomato plants.

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Boosting photosynthetic machinery and defense priming with chitosan application on tomato plants infected withFusarium oxysporumf. sp.lycopersici

Carmona

Villarreal-Navarrete

Burbano-David

et al. 2020

Preprint

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ArabidopsisTopless-related 1 mitigates physiological damage and growth penalties of induced immunity

Griebel

Lapin

Locci

et al. 2021

Preprint

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Transcriptional corepressors of the Topless family are important regulators of plant hormone and immunity signaling. The lack of a genome-wide profile of their chromatin associations limits understanding of transcriptional regulation in plant immune responses. Chromatin immunoprecipitation with sequencing (ChIP-seq) was performed on GFP-tagged Topless-related 1 (TPR1) expressed in Arabidopsis thaliana lines with and without constitutive immunity dependent on Enhanced Disease Susceptibility 1 (EDS1). RNA-seq profiling of pathogen-infected tpl/tpr mutants and assessments of growth and physiological parameters were employed to determine TPL/TPR roles in transcriptional immunity and defense homeostasis. TPR1 bound to promoter regions of ~1,400 genes and ~10% of the detected binding required EDS1 immunity signaling. A tpr1 tpl tpr4 (t3) mutant displayed mildly enhanced defense-related transcriptional reprogramming upon bacterial infection but not increased bacterial resistance. Bacteria or pep1 phytocytokine-challenged t3 plants exhibited, respectively, photosystem II dysfunction and exacerbated root growth inhibition. Transgenic expression of TPR1 restored the t3 physiological defects. We propose that TPR1 and TPL-family proteins function in Arabidopsis to reduce detrimental effects associated with activated transcriptional immunity.

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Arabidopsis Topless‐related 1 mitigates physiological damage and growth penalties of induced immunity

et al. 2023

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Summary Transcriptional corepressors of the Topless (TPL) family regulate plant hormone and immunity signaling. The lack of a genome‐wide profile of their chromatin associations limits understanding of the TPL family roles in transcriptional regulation. Chromatin immunoprecipitation with sequencing (ChIP‐Seq) was performed on Arabidopsis thaliana lines expressing GFP‐tagged Topless‐related 1 (TPR1‐GFP) with and without constitutive immunity via Enhanced Disease Susceptibility 1 (EDS1). RNA‐Seq profiling of the TPR1‐GFP lines and pathogen‐infected tpl/tpr mutants, combined with measuring immunity, growth, and physiological parameters was employed to investigate TPL/TPR roles in immunity and defense homeostasis. TPR1 was enriched at promoter regions of c. 1400 genes and c. 10% of the detected binding required EDS1 immunity signaling. In a tpr1 tpl tpr4 (t3) mutant, resistance to bacteria was slightly compromised, and defense‐related transcriptional reprogramming was weakly reduced or enhanced, respectively, at early (< 1 h) and late 24 h stages of bacterial infection. The t3 plants challenged with bacteria or pathogen‐associated molecular pattern nlp24 displayed photosystem II dysfunctions. Also, t3 plants were hypersensitive to phytocytokine pep1 at the level of root growth inhibition. Transgenic expression of TPR1 rescued these t3 physiological defects. We propose that TPR1 and TPL family proteins function in Arabidopsis to reduce detrimental effects associated with activated transcriptional immunity.

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Growth, Development and Yield of Infected and Infested Plants and Crops

Cited by 3 publications

References 57 publications

Boosting photosynthetic machinery and defense priming with chitosan application on tomato plants infected withFusarium oxysporumf. sp.lycopersici

Boosting photosynthetic machinery and defense priming with chitosan application on tomato plants infected withFusarium oxysporumf. sp.lycopersici

ArabidopsisTopless-related 1 mitigates physiological damage and growth penalties of induced immunity

Arabidopsis Topless‐related 1 mitigates physiological damage and growth penalties of induced immunity

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