The Influence of Powdery Mildew upon the Cytokinins and the Morphology of Barley Roots

Vizárová, G.; Minarčic, P.

doi:10.1111/j.1439-0434.1974.tb02775.x

Cited by 16 publications

(7 citation statements)

References 11 publications

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“…Indeed, Carmi & Koller (1979) and Wareing et al (1968) concluded that partial defoliation led to the diversion of increasing amounts of some promotive factors, such as cytokinins, from the roots to the remaining leaves, thus increasing their photosynthetic capacity over a period of several days. This is very interesting in view of the observations (albeit based on bioassays) of Vizarova & Minarcic (1974), who found a transient increase in cytokinin levels in roots of mildewed barley and enhanced levels in shoots. However, we have no information on cytokinin levels in uninfected leaves on mildewed plants, and furthermore, in partially infected plants, the mildewed leaves act as quite vigorous ' sinks ', presumably not just for assimilates but perhaps also for other substances (e.g.…”

Section: A Diversion -Are There Lessons To Be Learnt From Partial Defmentioning

confidence: 77%

“…It seems possible that mildew infection resulted in an alteration of the selectivity of host-cell membranes to sodium and potassium ions. Some workers have found that synthetic cytokinins can cause a change in potassium/sodium selectivity (Jacoby & Dagan, 1970;Ilan, 1971); this is interesting in view of the observed changes in cytokinin levels in roots of mildewed barley (Vizarova & Minarcic, 1974). Evidence has been presented (Lin, 1979) to support the coupling of an electrogenic H+/K+ exchanging ATPase to an OH-/Pi antiporter in maize root tissues.…”

Section: I O N Uptake a N D T R A N S P O R Tmentioning

confidence: 93%

“…After that time, cytokinins in roots returned to normal levels, but enhanced levels were detected in mildewed shoots. It has been suggested that these changes in cytokinins in mildewed barley may be associated with changes in root morphology (Vizarova & Minarcic, 1974;Walters & Ayres, 1981 b). However, the exact role of these alterations in hormone levels in diseased plants remains obscure, primarily due to the inability to define the underlying mechanisms in healthy plants.…”

Section: Assimilate Partitioningmentioning

confidence: 99%

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Shoot:root Interrelationships: The Effects of Obligately Biotrophic Fungal Pathogens

Walters¹

1985

Biological Reviews

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Section: A Diversion -Are There Lessons To Be Learnt From Partial Defmentioning

confidence: 77%

Section: I O N Uptake a N D T R A N S P O R Tmentioning

confidence: 93%

Section: Assimilate Partitioningmentioning

confidence: 99%

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Shoot:root Interrelationships: The Effects of Obligately Biotrophic Fungal Pathogens

Walters¹

1985

Biological Reviews

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“…Soil temperatures and, later, air temperatures determine rates of leaf initiation and expansion in barley (Scott & Dennis-Jones, 1976). These rates may also be influenced by assimilate supply, which is reduced in infected plants through destruction of photosynthetic capacity and induced changes in growth regulator activity (Vizarova & Minarcic, 1974). Early infections in the field may develop soon after crop emergence and might be expected to affect leaf initiation and expansion.…”

Section: Discussionmentioning

confidence: 99%

Effects of Pyrenophora teres on dry matter production and yield components of winter barley

1985

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Inoculation of winter barley plants in a glasshouse with Pyrenophora teres at three different growth stages (GS 11, 13 or 30) greatly decreased root and shoot dry matter production and the size of healthy leaves produced subsequently, but there was no significant yield loss with a single inoculation at GS 11 or 30. Inoculation at GS 13, GS 31 or GS 39 decreased grain yield by 12,17 and 20% respectively, and also straw yield. Larger yield losses resulted from repeated inoculations on five successive occasions (GS 11, 13, 30, 31 and 39) which caused much disease on all leaves throughout the life of the plant. All components of yield measured were decreased by the cumulative effect of successive inoculations; ear number by 15%), grain sites per ear by 20%, grain yield by 48% and straw yield by 32%.

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“…Photosynthesis (Paulech, 1966;Scott and Smillie, 1966) and transpiration (Martin et al, 1975;Priehradny, 1978;Ayres, 1978) are hampered and leaf senescence is promoted (Finney, 1979). Growth and activity of the roots are affected (Baenziger et al, 1979;Vizarova and Minar9ic, 1974).…”

Section: Introductionmentioning

confidence: 99%

Damage components of powdery mildew in winter wheat

Rabbinge¹,

Jorritsma²,

Schans³

1985

Netherlands Journal of Plant Pathology

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The photosynthesis and transpiration rates of winter wheat leaves were measured at different developmental stages and at various levels of mildew infection. Even at low levels of infection, circa 40Jo leaf area being covered, both the assimilation and transpiration rates at light satiation were considerably reduced. Light use efficiency and dark respiration were not significantly affected. The physiological background of these effects was analysed by photosynthesis measurements at different external COz concentrations. It was shown that the carboxylation resistance was increased due to mildew infection and that stomatal resistance, boundary layer resistance and transport resistance in the mesophyll were only indirectly affected.A simulation model was used to compute the consequences of these effects on daily growth rate of a winter wheat canopy at different development stages and with different levels of mildew severity. These computations show that a low infection level may result in a considerable reduction of the crop growth rate. This effect was more pronounced when the sky was clear than overcast.

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The Influence of Powdery Mildew upon the Cytokinins and the Morphology of Barley Roots

Cited by 16 publications

References 11 publications

Shoot:root Interrelationships: The Effects of Obligately Biotrophic Fungal Pathogens

Shoot:root Interrelationships: The Effects of Obligately Biotrophic Fungal Pathogens

Effects of Pyrenophora teres on dry matter production and yield components of winter barley

Damage components of powdery mildew in winter wheat

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