Getting to the root of a club – Understanding developmental manipulation by the clubroot pathogen

Vañó, Marina Silvestre; Nourimand, Maryam; MacLean, Allyson M.; Pérez‐López, Edel

doi:10.1016/j.semcdb.2023.02.005

Cited by 10 publications

(6 citation statements)

References 134 publications

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“…In addition, salicylic acid can induce cell wall strengthening as a resistance response to plant disease [50]. Vañò et al [51] supported the key role of the salicylic acid in plant defense, suggesting that it could play a significant role in the response to the presence of X. fastidiosa in the vessels. On the other hand, the unexpected significant increase in tyrosol in symptomatic plants (Figure 8) may be related to the water stress suffered by symptomatic plants, as indicated by Mechri et al [52], who reported that the concentration of tyrosol was significantly increased in olive trees under water-stressed conditions.…”

Section: Discussionmentioning

confidence: 99%

The Significance of Xylem Structure and Its Chemical Components in Certain Olive Tree Genotypes with Tolerance to Xylella fastidiosa Infection

Sabella,

Buja,

Negro

et al. 2024

Plants

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Olive quick decline syndrome (OQDS) is a devastating plant disease caused by the bacterium Xylella fastidiosa (Xf). Exploratory missions in the Salento area led to the identification of putatively Xf-resistant olive trees (putatively resistant plants, PRPs) which were pauci-symptomatic or asymptomatic infected plants belonging to different genetic clusters in orchards severely affected by OQDS. To investigate the defense strategies employed by these PRPs to contrast Xf infection, the PRPs were analyzed for the anatomy and histology of xylem vessels, patterns of Xf distribution in host tissues (by the fluorescent in situ hybridization technique—FISH) and the presence of secondary metabolites in stems. The xylem vessels of the PRPs have an average diameter significantly lower than that of susceptible plants for each annual tree ring studied. The histochemical staining of xylem vessels highlighted an increase in the lignin in the parenchyma cells of the medullary rays of the wood. The 3D images obtained from FISH-LSM (laser scanning microscope) revealed that, in the PRPs, Xf cells mostly appeared as individual cells or as small aggregates; in addition, these bacterial cells looked to be incorporated in the autofluorescence signal of gels and phenolic compounds regardless of hosts’ genotypes. In fact, the metabolomic data from asymptomatic PRP stems showed a significant increase in compounds like salicylic acid, known as a signal molecule which mediates host responses upon pathogen infection, and luteolin, a naturally derived flavonoid compound with antibacterial properties and with well-known anti-biofilm effects. Findings indicate that the xylem vessel geometry together with structural and chemical defenses are among the mechanisms operating to control Xf infection and may represent a common resistance trait among different olive genotypes.

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Section: Discussionmentioning

confidence: 99%

The Significance of Xylem Structure and Its Chemical Components in Certain Olive Tree Genotypes with Tolerance to Xylella fastidiosa Infection

Sabella,

Buja,

Negro

et al. 2024

Plants

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“…Vañó et al proposed that SA, as a crucial phytohormone with a special role in plant defense responses to pathogens, is targeted by many clubroot pathogens, which actively attempt to suppress SA biosynthesis, accumulation, or downstream function [60]. Wang et al reported that in apple, SA significantly upregulates NPR1 and PR1 and enhances endogenous SA levels.…”

Section: The Role Of Sa In Plant Tolerance Responses To Biotic Stressesmentioning

confidence: 99%

“…During its activation of relevant plant defense mechanism, SA can enhance the activities and expressions of antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) [11,20,[53][54][55][56][57][58][59]. Meanwhile, SA can induce the biosynthesis of active anti-pathogenic substances [1,[60][61][62][63][64][65][66], thereby enhancing plant tolerance to biotic stresses caused by pathogens, fungi, and pests.…”

Section: Introductionmentioning

confidence: 99%

Advances in Roles of Salicylic Acid in Plant Tolerance Responses to Biotic and Abiotic Stresses

Song,

Shao,

Zheng

et al. 2023

Plants

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A multitude of biotic and abiotic stress factors do harm to plants by bringing about diseases and inhibiting normal growth and development. As a pivotal signaling molecule, salicylic acid (SA) plays crucial roles in plant tolerance responses to both biotic and abiotic stresses, thereby maintaining plant normal growth and improving yields under stress. In view of this, this paper mainly discusses the role of SA in both biotic and abiotic stresses of plants. SA regulates the expression of genes involved in defense signaling pathways, thus enhancing plant immunity. In addition, SA mitigates the negative effects of abiotic stresses, and acts as a signaling molecule to induce the expression of stress-responsive genes and the synthesis of stress-related proteins. In addition, SA also improves certain yield-related photosynthetic indexes, thereby enhancing crop yield under stress. On the other hand, SA acts with other signaling molecules, such as jasmonic acid (JA), auxin, ethylene (ETH), and so on, in regulating plant growth and improving tolerance under stress. This paper reviews recent advances in SA’s roles in plant stress tolerance, so as to provide theoretical references for further studies concerning the decryption of molecular mechanisms for SA’s roles and the improvement of crop management under stress.

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“…It affects more than 60 countries worldwide [3], leading to significant yield and economic losses [4,5]. Clubroot disease-infected plants generate root galls [6], which disrupt the plants' water and nutrient balance and hinder their normal growth [6][7][8][9]. A definitive cure for the clubroot disease has not yet been found.…”

Section: Introductionmentioning

confidence: 99%

Identification of Clubroot-Resistant Germplasm in a Radish (Raphanus sativus L.) Core Collection

Ma,

Wang,

Song

et al. 2024

Agronomy

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Clubroot disease, caused by Plasmodiophora brassicae, poses a significant global threat to cruciferous crops. The epidemic area of clubroot disease is expanding rapidly. In response to this pressing issue, there is a compelling need for the development of clubroot disease-resistant radish cultivars. China boasts an extensive array of radish varieties and germplasm resources. However, a comprehensive assessment of their resistance to clubroot has not yet been carried out, thereby impeding the effective utilization of germplasm and clubroot-resistant breeding. Therefore, it is urgent to systematically evaluate the clubroot resistance of the radish germplasm and identify resistant resources. In this study, clubroot resistance evaluations were conducted on 268 excellent radish varieties derived from 30 provinces in China, as well as seven accessions from Russia, North Korea, France, South Korea, and Germany. The resistance evaluation revealed a diverse range of resistance indices, with a mean disease index (DI) ranging from 0.6 to 58.5, showing significant disparities in clubroot resistance among these radish resources. A total of six accessions were characterized as highly resistant to clubroot, and a further 50 accessions were characterized as resistant. The disease-resistant radishes showed diversity in horticultural traits. Provinces in South China contributed significantly more resistance germplasm than those of North China. These materials are of great value for both genetic investigation and the crop breeding of clubroot resistance. Furthermore, we employed a previously established clubroot-resistance-linked SSR marker to analyze the clubroot-resistant resources. The accessions exhibited dissimilar genetic profiles from known clubroot-resistant germplasm, suggesting their potential status as novel sources of clubroot resistance. Conclusively, these newly identified accessions enriched the genetic diversity within the clubroot-resistant gene pool and may contribute to the future cloning of previously undiscovered clubroot-resistant genes.

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Getting to the root of a club – Understanding developmental manipulation by the clubroot pathogen

Cited by 10 publications

References 134 publications

The Significance of Xylem Structure and Its Chemical Components in Certain Olive Tree Genotypes with Tolerance to Xylella fastidiosa Infection

The Significance of Xylem Structure and Its Chemical Components in Certain Olive Tree Genotypes with Tolerance to Xylella fastidiosa Infection

Advances in Roles of Salicylic Acid in Plant Tolerance Responses to Biotic and Abiotic Stresses

Identification of Clubroot-Resistant Germplasm in a Radish (Raphanus sativus L.) Core Collection

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