Postharvest quality of plums in response to the occurrence of leaf scald disease

Kleina, Heloisa Thomazi; Padua, T. de; Jacomino, Ângelo Pedro; Mio, Louise Larissa May De

doi:10.1016/j.postharvbio.2018.04.018

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…Cultivation of plum has a great economic importance (Schneider et al, 2017) and the plum leaf scald (PLS) disease, caused by X. fastidiosa, represents a limiting factor for plum production (Dalbo et al, 2018). Symptoms are characterised by leaf scorch and brown rot but the disease produces low fruit quality affecting negatively the weight, the firmness and the size of the fruits (Kleina et al, 2018). The spread of the PLS in Brazil is due to the presence of alternative hosts and efficient and widespread vectors (sharpshooters) (Dalb o et al, 2016).…”

Section: Cherry and Plummentioning

confidence: 99%

Update of the Scientific Opinion on the risks to plant health posed by Xylella fastidiosa in the EU territory

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2019

EFS2

140

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EFSA was asked to update the 2015 EFSA risk assessment on Xylella fastidiosa for the territory of the EU. In particular, EFSA was asked to focus on potential establishment, short-and long-range spread, the length of the asymptomatic period, the impact of X. fastidiosa and an update on risk reduction options. EFSA was asked to take into account the different subspecies and Sequence Types of X. fastidiosa. This was attempted throughout the scientific opinion but several issues with data availability meant that this could only be partially achieved. Models for risk of establishment showed most of the EU territory may be potentially suitable for X. fastidiosa although southern EU is most at risk. Differences in estimated areas of potential establishment were evident among X. fastidiosa subspecies, particularly X. fastidiosa subsp. multiplex which demonstrated areas of potential establishment further north in the EU. The model of establishment could be used to develop targeted surveys by Member States. The asymptomatic period of X. fastidiosa varied significantly for different host and pathogen subspecies combinations, for example from a median of approximately 1 month in ornamental plants and up to 10 months in olive, for pauca. This variable and long asymptomatic period is a considerable limitation to successful detection and control, particularly where surveillance is based on visual inspection. Modelling suggested that local eradication (e.g. within orchards) is possible, providing sampling intensity is sufficient for early detection and effective control measures are implemented swiftly (e.g. within 30 days). Modelling of long-range spread (e.g. regional scale) demonstrated the important role of long-range dispersal and the need to better understand this. Reducing buffer zone width in both containment and eradication scenarios increased the area infected. Intensive surveillance for early detection, and consequent plant removal, of new outbreaks is crucial for both successful eradication and containment at the regional scale, in addition to effective vector control. The assessment of impacts indicated that almond and Citrus spp. were at lower impact on yield compared to olive. Although the lowest impact was estimated for grapevine, and the highest for olive, this was based on several assumptions including that the assessment considered only Philaenus spumarius as a vector. If other xylem-feeding insects act as vectors the impact could be different. Since the Scientific Opinion published in 2015, there are still no risk reduction options that can remove the bacterium from the plant in open field conditions. Short-and long-range spread modelling showed that an early detection and rapid application of phytosanitary measures, consisting among others of plant removal and vector control, are essential to prevent further spread of the pathogen to new areas. Further data collection will allow a reduction in uncertainty and facilitate more tailored and effective control given the intraspecific diversity of X. fastidiosa an...

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Section: Cherry and Plummentioning

confidence: 99%

Update of the Scientific Opinion on the risks to plant health posed by Xylella fastidiosa in the EU territory

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2019

EFS2

140

View full text Add to dashboard Cite

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“…As the disease progresses, leaf desiccation intensifies (Raju et al, 1982), leading to plant death. In addition, fruit from trees affected by PLS have reduced size, lower pulp firmness, and marked weight loss during the postharvest period (Kleina et al, 2018). This bacterium has a wide range of alternative hosts, including several mono-and dicotyledonous species (Bragard et al, 2019).…”

mentioning

confidence: 99%

Volatile compounds from plum genotypes with different levels of resistance to leaf scald disease

et al. 2021

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Plum leaf scald (PLS) is the main obstacle to plum expansion in Brazil. This disease is caused by Xylella fastidiosa, which colonizes the foregut of xylem‐sap feeding insects and the xylem of the plants. Breeding programmes identified new plum genotypes that showed no leaf scald symptoms in the field and remained negative for X. fastidiosa for at least 10 years. However, the mechanisms that confer this resistance are not fully elucidated. One hypothesis is the emission of volatile organic compounds by the host. Therefore, we investigated the volatile compound profile from six plum genotypes with different resistance levels to PLS. Thirty‐nine compounds were identified. The major constituents in the plum volatile extract were phytol (46.76%) and limonene (2.48%). Cultivar Laetitia presented the highest total alkane content, Simka showed the highest alcohol content, while Fortune and SC13 exhibited the highest concentration of ketones. Cedrol was not detected in susceptible genotypes but was found in the resistant ones, SC7 and SC15. (E,E)‐α‐farnesene was detected in high concentrations in Fortune but was not found in SC13 and SC15. According to principal components analysis, genotypes were divided into four groups based on the similarity of the volatile profile: 1: Fortune and Laetitia; 2: Simka and SC13; 3: SC7; and 4: SC15. This is the first description of leaf volatile chemical components of Prunus salicina, and the putative factor related to resistance in SC7 and SC15 is discussed. We also propose a terpene pathway of the main volatile compounds found.

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“…Between the 1970s and 1980s, there was a considerable reduction in yield and an increase in eradicating orchards in Minas Gerais, Rio Grande do Sul, and Paranà (Ferreira et al, 2016). PLS dramatically reduces the quality of plums, which have lower weight and diameter; fruits are also more sensitive to Monilina fructicola (Kleina et al, 2018). In Brazil, PLS was observed on 31 cultivars of P. salicina and six cultivars of P. domestica 1 .…”

Section: Subspeciesmentioning

confidence: 99%

Diseases Caused by Xylella fastidiosa in Prunus Genus: An Overview of the Research on an Increasingly Widespread Pathogen

et al. 2021

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Cultivated plants belonging to the genus Prunus are globally widespread and for some countries, are economically important crops; and they play a key role in the composition of a landscape. Xylella fastidiosa is a key threat to plant health, and several Prunus species are heavily stressed by this pathogen, such as almond, peach, and plum; many strain types of different subspecies can cause severe diseases. This review highlights different approaches to managing epidemic events related to X. fastidiosa in stone fruit plants. In fact, in most new European and Asian outbreaks, almond is the main and very common host and peach, plum, apricot, and cherry are widespread and profitable crops for the involved areas. Various diseases associated with stone fruit plants show different degrees of severity in relation to cultivar, although investigations are still limited. The development and selection of tolerant and resistant cultivars and the study of resistance mechanisms activated by the plant against X. fastidiosa infections seem to be the best way to find long-term solutions aimed at making affected areas recover. In addition, observations in orchards severely affected by the disease can be essential for collecting tolerant or resistant materials within the local germplasm. In areas where the bacterium is not yet present, a qualitative-quantitative study on entomofauna is also important for the timely identification of potential vectors and for developing effective control strategies.

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Postharvest quality of plums in response to the occurrence of leaf scald disease

Cited by 12 publications

References 25 publications

Update of the Scientific Opinion on the risks to plant health posed by Xylella fastidiosa in the EU territory

Update of the Scientific Opinion on the risks to plant health posed by Xylella fastidiosa in the EU territory

Volatile compounds from plum genotypes with different levels of resistance to leaf scald disease

Diseases Caused by Xylella fastidiosa in Prunus Genus: An Overview of the Research on an Increasingly Widespread Pathogen

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