Solar radiation affects grapevine susceptibility to Plasmopara Viticola

Marta, Anna Dalla; Stefano, V. Di; Cerović, Zoran G.; Agati, Giovanni; Orlandini, Simone

doi:10.1590/s0103-90162008000700011

Cited by 9 publications

(6 citation statements)

References 19 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our studies with okra, we have found no effect of a high nitrogen application (administered daily instead of weekly) on flavonoids independent of the UV treatments (data not shown). Higher flavonoid concentrations have also been found to be associated with improved defense against pathogens in some species (e.g., grapevine) (Agati et al, 2008;Dalla Marta et al, 2008), but this was addressed in our study. We did find, however, that leaf age and surface (abaxial vs. adaxial) were factors that affected UV-absorbing compound concentrations in the leaf.…”

Section: Discussionmentioning

confidence: 79%

Rapid adjustment in epidermal UV sunscreen: Comparison of optical measurement techniques and response to changing solar UV radiation conditions

Neugart

Tobler

Barnes

2021

Physiologia Plantarum

View full text Add to dashboard Cite

The accumulation of soluble and cell-wall bound UV-absorbing compounds (i.e., flavonoids) in the epidermis and the mesophyll of leaves is a response of plants to UV exposure. These compounds are known to function in UV screening, but they are also of potential value for food quality. One way to non-destructively monitor UV screening in leaves is by optical methods, from which UVA-PAM and Dualex instruments stand out. The degree and rapidity to which plants can modulate UV screening in response to fluctuating solar UV conditions is poorly understood. In this study, okra plants were exposed to two solar radiation treatments (near-ambient UV [+UV] and attenuated UV [ÀUV]) and the epidermal UV transmittance (T UV ; UVA-PAM) and flavonoid index (Dualex) were measured in the youngest and second youngest mature leaves over three consecutive days and within an individual day. The day-to-day (measured near solar noon) and diurnal (over the course of a day) measurements of leaf optical properties indicated that T UV decreased and flavonoid index increased in the adaxial epidermis $50% until 15:00 CDT then returned close to morning values later in the day. Correlations between UV-B radiation and T UV and flavonoid index revealed highest values 30 min to 1 h prior to the measurements. These findings indicate that plants can respond quickly to fluctuating solar UV conditions and underlines the importance of the harvest-time point for health-promoting compounds in fruit and vegetables. Our findings also indicate that the UVA-PAM and the Dualex instruments are both suitable instruments to monitor rapid changes in UV screening in plants. | INTRODUCTIONUltraviolet radiation (UV; 280-400 nm, including the UV-B [280-315 nm] and UV-A [315-400 nm] wavebands) comprises a relatively small portion of the total solar radiant energy reaching the Earth's surface, but this radiation has the potential to induce a number of photomorphogenic and deleterious effects in plants. These effects include oxidative damage, changes in plant biochemistry, partial inhibition of photosynthesis, and growth reduction (Albert et al., 2011;Hideg et al., 2013;Jordan, 2002). However, plants possess a number of UV protective mechanisms that can mitigate much of the UV-induced damage under normal field conditions (Jansen et al., 1998). In particular, studies have highlighted the regulatory properties of low, ecologically relevant UV-B levels that can trigger structure-dependent accumulation of polyphenols (Neugart et al., 2012;Schreiner et al., 2012). The increase in polyphenols, such as flavonoids and hydroxycinnamic acids,

show abstract

Section: Discussionmentioning

confidence: 79%

Rapid adjustment in epidermal UV sunscreen: Comparison of optical measurement techniques and response to changing solar UV radiation conditions

Neugart

Tobler

Barnes

2021

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…Both UV-A and UV-B are able to increase flavonoid levels, but UV-B has stronger efficacy [49]. However, there are also other factors influencing flavonoid content, for example, negative correlations with nitrogen concentrations and pathogen infestation [50][51][52][53]. This highlights the regulatory effect that UV radiation has on plant mechanisms as presented by flavonoid glycosides and hydroxycinnamic acids here.…”

Section: Flavonoidsmentioning

confidence: 86%

The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra

Neugart

Tobler

Barnes

2021

Plants

View full text Add to dashboard Cite

Flavonoids are favored compounds in plant responses to UV exposure and act in UV absorption and antioxidant activity. Here, it was investigated, with okra as a model species, how fast plants can react to changing UV conditions and to what extent these reactions take place. Okra (Abelmoschus esculentus) plants were exposed to either full or nearly no UV radiation. The diurnal rhythm of the plants was driven by the UV radiation and showed up to a 50% increase of the flavonoid content (measured optically in the +UV plants). This was reflected only in the trends in UV-absorption and antioxidant activity of the extracts but not in the soluble flavonoid glycosides and hydroxycinnamic acid derivatives. In a second experiment, a transfer from a −UV to a +UV condition at 9:00 CDT showed the immediate start of the diurnal rhythm, while this did not occur if the transfer occurred later in the day; these plants only started a diurnal rhythm the following day. After an adaptation period of seven days, clear differences between the +UV and -UV plants could be found in all parameters, whereas plants transferred to the opposite UV condition settle between the +UV and -UV plants in all parameters. Broadly, it can be seen that the flavonoid contents and associated functions in the plant are subject to considerable changes within one day and within several days due to the UV conditions and that this can have a considerable impact on the quality of plant foods.

show abstract

“…Atmospheric phenomena also bring a considerable influence over mandatory stages related to crop development and management, too. Solar energy is relevant for all stages of crop development, from seed germination to flowering/fruiting, and its effects can be either positive or negative [5][6][7][8]. Green plants use photosynthetically active radiation (PAR) for photosynthesis.…”

Section: Introductionmentioning

confidence: 99%

“…[9]. Regarding grapevine leaves' resistance to downy mildew (Plasmopara viticola), the leaves receiving 100% solar radiation should have fewer mildew problems than the shadowed leaves [6]. Solar radiation also has a significant role in evaporation and transpiration evaporation processes and, since they are interconnected, the common term to express them is crop evapotranspiration (crop ET) [10].…”

Section: Introductionmentioning

confidence: 99%

Predictive Analysis and Wine-Grapes Disease Risk Assessment Based on Atmospheric Parameters and Precision Agriculture Platform

et al. 2022

View full text Add to dashboard Cite

In the precision viticulture domain, data recorded by monitoring devices are large-scale processed to improve solutions for grapes’ quality and global production and to offer various recommendations to achieve these goals. Soil-related parameters (soil moisture, structure, etc.) and atmospheric parameters (precipitation, cumulative amount of heat) may facilitate crop diseases occurrence; thus, following predictive analysis, their estimation in vineyards can offer an early-stage warning for farmers and, therefore, suggestions for their prevention and treatment are of particular importance. Using remote sensing devices (e.g., satellites, unmanned vehicles) and proximal sensing methods (e.g., wireless sensor networks (WSNs)), we developed an efficient precision agriculture telemetry platform to provide reliable assessments of atmospheric phenomena periodicity and crop diseases estimation in a vineyard near Bucharest, Romania. The novelty of the materials and methods of this work relies on providing comprehensive preliminary references about monitored parameters to enable efficient, sustainable agriculture. Comparative analyses for two consecutive years illustrate an excellent correlation between cumulative and daily heat, precipitation quantity, and daily evapotranspiration (ET). In addition, the platform proved viable for wine-grapes disease estimation (powdery mildew, grape bunch rot, and grape downy mildew) and treatment recommendations based on the elaborated phenological calendar. Our results, together with continuous monitoring for the upcoming years, may be used as a reference to perform productive, sustainable smart agriculture in terms of yield and crop quality in Romania. In the Conclusion section, we show that farmers and personnel from cooperatives can use this information to make assessments based on the correlation of the available data to avoid critical damage to the wine-grape.

show abstract

Solar radiation affects grapevine susceptibility to Plasmopara Viticola

Cited by 9 publications

References 19 publications

Rapid adjustment in epidermal UV sunscreen: Comparison of optical measurement techniques and response to changing solar UV radiation conditions

Rapid adjustment in epidermal UV sunscreen: Comparison of optical measurement techniques and response to changing solar UV radiation conditions

The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra

Predictive Analysis and Wine-Grapes Disease Risk Assessment Based on Atmospheric Parameters and Precision Agriculture Platform

Contact Info

Product

Resources

About