Some Effects of Uromyces phaseoli on the Transpiration Rate and Stomatal Response of Bean Leaves

Duniway, J. M.; Durbin, R. D.

doi:10.1094/phyto-61-114

Cited by 44 publications

(22 citation statements)

References 3 publications

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“…This appears to be due to inhibition of stomal opening by the pathogen, which also reduced the rate of stomal opening. At the onset of sporulation, the effect was reversed due to the ruptured epidermis, and the transpiration rate of diseased leaves (under both light and dark conditions) was significantly greater than that of the control (Duniway and Durbin 1971b). When subjected to mild drought conditions [1300 ft-c (approximately 14,000 lux), 27 C, and 55% RH], diseased plants became significantly more susceptible to drought.…”

Section: Economic Importancementioning

confidence: 97%

“…Green islands without sporulating pustules have also been observed in the field and greenhouse in South Africa (Liebenberg, unpubl.). Premature chlorosis, senescence, and defoliation can also take place due to high respiration rates (Duniway and Durbin 1971b). Pustule type is a function of the race-host interaction (Harter et al 1935;Harter and Zaumeyer 1941); consequently, where more than one race is present, more than one type can occur simultaneously on the same leaf.…”

Section: Symptomsmentioning

confidence: 99%

See 1 more Smart Citation

Common Bean Rust: Pathology and Control

Liebenberg¹,

Pretorius

2010

Horticultural Reviews, Volume 37

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Section: Economic Importancementioning

confidence: 97%

Section: Symptomsmentioning

confidence: 99%

Common Bean Rust: Pathology and Control

Liebenberg¹,

Pretorius

2010

Horticultural Reviews, Volume 37

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“…A transpiração de folhas doentes pode ser maior ou menor que aquela de folhas sadias (Duniway & Durbin, 1971;Shtienberg, 1992;Bassanezi et al, 1997). O aumento da transpiração pode ser ocasionado pela destruição da cutícula, pelo aumento da permeabilidade da membrana das células da folha e pela inibição do fechamento dos estômatos.…”

Section: Abstract Changes In Photosynthesis and Transpiration Of Cornunclassified

Alterações na fotossíntese e na transpiração de folhas de milho infetadas por Phaeosphaeria maydis

2001

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RESUMOO efeito da mancha foliar de Phaeosphaeria, causada por Phaeosphaeria maydis, na taxa líquida de fotossíntese e na transpiração de folhas de milho (Zea mays) foi avaliado no campo em três híbridos e uma linhagem de milho. A taxa líquida de fotossíntese foi relacionada à severidade da doença por meio do modelo P x /P o =(1-x) β , onde P x representa a taxa fotossintética líquida de folhas com severidade de doença x (em proporção), P o representa a taxa fotossintética líquida média de folhas sadias e β representa a relação entre a lesão virtual (área foliar com fotossíntese nula) e a lesão visual (área foliar coberta por sintomas). O parâmetro β caracteriza o efeito do patógeno em toda a gama de severidade de doença.Os valores de β determinados por regressão não-linear (R 2 de 0,73 a 0,85 para os diferentes materiais) variaram entre 2,46 e 2,69. Esses valores indicam que houve redução da eficiência fotossintética não apenas no tecido lesionado, mas também em parte do tecido verde remanescente de folhas infetadas. Folhas com severidade de doença no intervalo de 10-20% mostraram reduções de 40% na taxa líquida de fotossíntese. A taxa de redução da transpiração foi proporcional à redução do tecido sadio. Houve relação linear negativa significativa (R 2 de 0,59 a 0,75 para os diferentes materiais) entre a taxa de transpiração e a severidade da doença.Palavras-chave: lesão virtual, eficiência fotossintética. ABSTRACT Changes in photosynthesis and transpiration of corn leaves infected by Phaeosphaeria maydisThe effect of Phaeosphaeria leaf spot, caused by Phaeosphaeria maydis, in the net photosynthetic rate and in the transpiration rate of maize (Zea mays) leaves was assessed under field condition, in three hybrids and one maize inbred. Photosynthetic rate was related to diseased leaf area by the model P x /P o =(1-x) β , where P x represents the net photosynthetic rate of a leaf with disease severity x (in proportion), P o represents the average net photosynthetic rate of healthy leaves, and β is an expression of the ratio between virtual (leaf area where photosynthesis is nil) and visual lesion (leaf area covered by symptoms). Parameter β characterizes the effect of the pathogen on the photosynthetic efficiency for the total range of measured disease severity. Values of β, determined by nonlinear regression analysis (R 2 from 0.73 to 0.85 for the different material), ranged from 2.46 to 2.69. These values indicated that the reduction in photosynthetic efficiency was detected not only in the lesioned tissue but also in part of the remaining green tissue of infected leaves. Reductions in net photosynthetic rate around 40% were observed to disease severity between 10 and 20%. The reduction in transpiration rate was proportional to reduction of healthy leaf area due to disease. There was a negative linear relation (R 2 from 0.59 to 0.75 for different materials) between transpiration rate and disease severity.A mancha foliar de Phaeosphaeria, causada pelo ascomiceto Phaeosphaeria maydis (Henn.) Rane, Payak & Renfro (...

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“…Higher differences of infection level than found in this study are necessary to be differentiable by thermography. An explanation for this is that different generations of pathogens occur at the same time and temperature effects vary during pathogenesis (Duniway and Durbin 1971;Smith et al 1986) so that differences may level out. Furthermore abiotic factors such as topography, soil type and also bordering vegetation are expected to have a larger effect on canopy temperature than leaf diseases.…”

Section: Discussionmentioning

confidence: 99%

Digital infrared thermography for monitoring canopy health of wheat

2007

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Computer-aided diagnosis and prognosis models have been used for management decisions in crop protection. Initial infection rate, temperature and leaf wetness are important parameters in disease epidemiology and for decision support models. So far, in-field variability and variability between fields have not been taken into account for management decisions in disease control. This study aimed at testing the use of an imaging IR thermography system as a tool for monitoring the microclimatic conditions promoting incidence and severity of diseases within wheat fields with a high spatial resolution. Experiments were conducted on the detection and differentiation of leaf wetness on a single leaf scale and a crop canopy scale (1 m 2 ) under controlled conditions. Field studies focused on comparing ground-based and air-borne thermographic data and linking these to ground-truth data.

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Some Effects of Uromyces phaseoli on the Transpiration Rate and Stomatal Response of Bean Leaves

Cited by 44 publications

References 3 publications

Common Bean Rust: Pathology and Control

Common Bean Rust: Pathology and Control

Alterações na fotossíntese e na transpiração de folhas de milho infetadas por Phaeosphaeria maydis

Digital infrared thermography for monitoring canopy health of wheat

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