Phenolic Compounds in Barley Varieties With Different Degree of Partial Resistance Against Powdery Mildew

Doll, Hans; Holm, Ulf; Søgaard, Bodil

doi:10.17660/actahortic.1994.381.78

Cited by 10 publications

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“…Interestingly, the lowest or highest TPC was recorded ( Figure 1 ) under conventional rice of second season crop (S4, S2). Evidence shows lower activity of phenolic component under chemical farming due to natural disruption of synthesis of antioxidants by higher accessibility of nitrogen [ 23 ] or ready availability of nutrients [ 24 , 25 ]. So, plants that are grown without chemicals can increase TPC or under pathogenic pressures [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Distribution of Phenolic Compounds and Antioxidative Activities of Rice Kernel and Their Relationships with Agronomic Practice

Kesarwani

Chiang

Chen

2014

The Scientific World Journal

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The phenolic and antioxidant activity of ethanolic extract of two Japonica rice cultivars, Taikeng no. 16 (medium and slender grain) and Kaohsiung no. 139 (short and round grain), grown under organic and conventional farming were examined. Analyses shows that Kaohsiung no. 139 contains the highest amount of secondary metabolites and continuous farming can increase its production. Results also suggest that phenolic content under different agronomic practices, has not shown significant differences but organically grown rice has proven to be better in higher accumulation of other secondary metabolites (2,2-diphenyl-1-picrylhydrazyl (DPPH), flavonoid content, and ferrous chelating capacity). In nutshell, genetic traits and environment have significant effect on phenolic compounds and the least variation reported under agronomic practices.

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Section: Resultsmentioning

confidence: 99%

Distribution of Phenolic Compounds and Antioxidative Activities of Rice Kernel and Their Relationships with Agronomic Practice

Kesarwani

Chiang

Chen

2014

The Scientific World Journal

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“…1990) resulting in readily accessible nitrogen, which has the potential to influence the synthesis of phenolic antioxidants. Certain conditions cause low concentrations of phenolic antioxidants in plants with increasing nutrient availability (Doll et al . 1994; Sander and Heitefuss 1998) under local agronomic practices.…”

Section: Resultsmentioning

confidence: 99%

Antioxidant Activity and Total Phenolic Content of Organically and Conventionally Grown Rice Cultivars Under Varying Seasons

Kesarwani

Chiang

Chen

et al. 2012

Journal of Food Biochemistry

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The secondary metabolites of milled rice influenced by agronomic practices, seasons and their interaction effects were investigated. The ethanol extracts of rice grains in two japonica cultivars were analyzed with different assays to measure the total phenolic content, reducing power, radical-scavenging activity and chelating activity. Similar to earlier studies of phytochemicals, significantly higher antioxidant values were recorded in the organic rice. Second crop (November/December) in comparison with first crop (June/July) had significantly higher values of antioxidant activities, except for the chelating effect. The interaction between the agronomic practices and seasons had a detrimental effect on the crops because the combined factors had a more significant role than each factor alone. Even with the alterations in their content, polyphenols were positively correlated with the antioxidant activities, with the exception of chelating activity, when considering both factors (agronomic practices and season). PRACTICAL APPLICATIONSOur investigation focused on marketed milled rice which had been underestimated or neglected for the secondary metabolites production in earlier studies. The experiments were conducted on commercially available milled rice for analytical comparison of organically and conventionally grown two japonica rice cultivars for phenolic compounds and antioxidant activities. The result described the positive behavior of milled rice toward the organic farming which enhanced the phytochemicals content and reported higher levels than conventionally grown rice on average. Furthermore, the amounts were higher during winter season as compared with the summer period. The results provide information that the organically grown milled rice could be a potent natural antioxidant to protect against oxidative damage in regular diets while assuring sustainability and food safety. bs_bs_banner Journal of Food Biochemistry

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“…24 Moreover, papilla, which contain, among others, phenols, were about 50% thicker in the resistant line than they were in the nonresistant line. 38 Doll et al 39 evaluated the contribution of phenolic compounds in different barley varieties expressing partial resistance against powdery mildew and found a large, quantitative variation in the amount of nine phenolic components. That variation could also be a reason for the non-differentiation between the response of resistant and susceptible genotypes to powdery mildew by means of fluorescence spectroscopy in our studies.…”

Section: Discussionmentioning

confidence: 99%

Presymptomatic Detection of Powdery Mildew Infection in Winter Wheat Cultivars by Laser-Induced Fluorescence

2012

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The sensor-based monitoring of diseases under controlled conditions establishes an objective tool that allows a better understanding of the pathogen-plant interactions in different situations. The purpose of our work was to implement the presymptomatic detection of powdery mildew on wheat leaves shortly after fungus inoculation by spectral and time-resolved laser-induced fluorescence spectroscopy. In the general scope of plant phenotyping, we hypothesized that it is possible to discriminate between wheat genotypes that are either resistant or susceptible to powdery mildew. According to our results, the presymptomatic detection of powdery mildew on wheat leaves was accomplished, irrespective of genotype, as early as one day after inoculation using the fluorescence amplitude ratio F451:F522. Similarly, the ratios F451:F522, F522:F687, and F522:F736 of the half-bandwidth are also appropriate parameters. Furthermore, in the spectral range between 410 nm and 620 nm, the mean lifetime was significantly longer in inoculated leaves than it was in control leaves. Finally, the short-term (10-12 hour) increase of the fluorescence mean lifetime at 530 nm and 560 nm following the inoculation suggests that the speed of the plant reaction might be associated to its resistance to the pathogen. Based on this information, we conclude that determinations of ultraviolet, laser-induced fluorescence intensity and lifetime are suitable approaches to presymptomatically detect powdery mildew on wheat leaves one day after inoculation.

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Phenolic Compounds in Barley Varieties With Different Degree of Partial Resistance Against Powdery Mildew

Cited by 10 publications

References 0 publications

Distribution of Phenolic Compounds and Antioxidative Activities of Rice Kernel and Their Relationships with Agronomic Practice

Distribution of Phenolic Compounds and Antioxidative Activities of Rice Kernel and Their Relationships with Agronomic Practice

Antioxidant Activity and Total Phenolic Content of Organically and Conventionally Grown Rice Cultivars Under Varying Seasons

Presymptomatic Detection of Powdery Mildew Infection in Winter Wheat Cultivars by Laser-Induced Fluorescence

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