The Influence of Powdery Mildew Infection on Photosynthesis, Chlorophyll Fluorescence, Leaf Chlorophyll and Carotenoid Content of Three Woody Plant Species

Percival, Glynn C.; Fraser, Gillian A.

doi:10.1080/03071375.2002.9747348

Cited by 18 publications

(29 citation statements)

References 16 publications

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“…The inoculation with powdery mildew fungus resulted in a significant suppression in the photosynthesis rate, leaf pigments, plant growth and increase in the salicylic acid and phenol contents, transpiration rate and stomatal conductance over control. Development of the mildew colonies on the leaf surface would have reduced the incidence of light to the mesophyll cells evidenced by a significant reduction in the leaf chlorophyll and carotenoids 29 . Reduction in the photosynthetic pigments is directly correlated with photosynthetic efficiency of the leaf surface 29 .…”

Section: Discussionmentioning

confidence: 99%

“…Development of the mildew colonies on the leaf surface would have reduced the incidence of light to the mesophyll cells evidenced by a significant reduction in the leaf chlorophyll and carotenoids 29 . Reduction in the photosynthetic pigments is directly correlated with photosynthetic efficiency of the leaf surface 29 . As a result, the photosynthesis rate decreased significantly in all five infected cucurbit species.…”

Section: Discussionmentioning

confidence: 99%

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Effect of elevated levels of CO2 on powdery mildew development in five cucurbit species

Khan

Rizvi

2020

Sci Rep

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The environment is the key factor that influences the host-parasite relationship. Elevated CO 2 levels resulting from various anthropogenic sources may directly affect the surroundings around pathogens and plants. It is hypothesized that plants may respond differently to pathogens in the environment containing an elevated concentration of CO 2 . To test the hypothesis an experiment was conducted to examine the effects of intermittent exposures of elevated levels of CO 2 viz., 400, 500 and 600 ppm (5 hr/day on alternate days) on the development of Sphaerotheca fuliginea causing powdery mildew disease on five cucurbits species using open-top chambers. The elevated levels of CO 2 acted as a growth promoter and significantly enhanced the plant growth of all five cucurbit species. Inoculation with the fungus incited specific mildew symptoms on the leaves and decreased the plant growth and biomass production of the cucurbits tested except bitter gourd. The intermittent exposures with elevated levels of CO 2 aggravated the disease development. As a result, severe mildew developed on all five cucurbits, including bitter gourd, which expressed tolerance to the pathogen. Fungus colonization in terms of the number of conidia/cm 2 leaf surface was significantly greater on the plants exposed to 500 or 600 ppm CO 2 . The stomata and trichome density and stomatal pore width were increased in the leaves of co 2 exposed plants. The CO 2 exposures also accelerated the photosynthesis rate, but transpiration, stomatal conductance, salicylic acid and total phenols were decreased; fungus inoculation caused the effects just reverse of CO 2 . Interaction between S. fuliginea and CO 2 was found synergistic at 500 ppm, whereas with rest of the concentrations it was near to additive.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of elevated levels of CO2 on powdery mildew development in five cucurbit species

Khan

Rizvi

2020

Sci Rep

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“…The impact of E. alphitoides on the leaf carbohydrate metabolism has been studied in detail. The pathogen was shown to reduce carbon assimilation (A n ) and translocation of carbohydrates from the infected leaves to the rest of the plant (Hewitt andAyres 1975, 1976;Percival and Fraser 2002;Hajji et al 2009). The reduction of A n is linked to an impact of the infection on both maximal light driven electron flux (J max ) and on apparent maximal velocity of RuBP carboxylation (Vc max ; Hajji et al 2009).…”

Section: At Leaf Levelmentioning

confidence: 99%

European oak powdery mildew: impact on trees, effects of environmental factors, and potential effects of climate change

Marçais

Desprez‐Loustau

2012

Annals of Forest Science

138

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• Context Powdery mildew is one of the most common diseases of oaks in Europe. After alarming reports in the beginning of the twentieth century following the presumed introduction of the invasive fungus, the disease has become familiar to foresters. However, its impact may vary greatly according to intrinsic and extrinsic factors. • Aims We aimed at providing updated and synthesised information on the impact of powdery mildew on oak and on the effects of environment on disease. • Methods A comprehensive literature review was performed, including old reports of the early epidemics to more recent data. • Results Tree growth patterns are of critical importance to explain the severity of the disease and the differences between juvenile and mature trees. A critical element, especially for infection of mature trees, is the availability of spores during the production of the first leaf flush. High disease impact is often related to modified growth patterns, either by environmental factors (insects or frost) or silvicultural practices (e.g., coppicing). • Conclusion Powdery mildew can have important impacts in natural oak regenerations and a significant role in decline of mature trees. Climate change might influence the disease severity mainly by altering the host pathogen phenological synchrony. Process-based models are required for reliable predictions.

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“…Infection by oak powdery mildew reduces carbon acquisition (Percival and Fraser, 2002) and even a modest infection of leaves (10-20%) can cause a significant decrease (Copolovici et al, 2014). However, according to Pap et al (2014) net photosynthesis is especially interrupted under the highest degree of leaf infection (>75%).…”

Section: Resultsmentioning

confidence: 99%

Effects of oak powdery mildew (Erysiphe alphitoides [Griffon and Maubl.] U. Braun and S. Takam.) on photosynthesis of pedunculate oak (Quercus robur L.)

Vastag

Kastori

Orlović

et al. 2019

Zb Mat srp prir nauk

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The Influence of Powdery Mildew Infection on Photosynthesis, Chlorophyll Fluorescence, Leaf Chlorophyll and Carotenoid Content of Three Woody Plant Species

Cited by 18 publications

References 16 publications

Effect of elevated levels of CO2 on powdery mildew development in five cucurbit species

Effect of elevated levels of CO2 on powdery mildew development in five cucurbit species

European oak powdery mildew: impact on trees, effects of environmental factors, and potential effects of climate change

Effects of oak powdery mildew (Erysiphe alphitoides [Griffon and Maubl.] U. Braun and S. Takam.) on photosynthesis of pedunculate oak (Quercus robur L.)

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