Abstract
The impact of ozone in predisposingPhaseolus vulgaris toBotrytis cinerea has been investigated. One day after 8 h exposures to 0, 120, 180 and 270 μg ozone m−3, primary and trifoliate leaves of four bean cultivars were detached and inoculated with conidia suspended in water or in an inorganic phosphate (Pi) solution. Visible ozone injury increased with increasing ozone concentrations in all cultivars. Primary leaves were more sensitive than trifoliate leaves. Conidia suspended in Pi solution caused lesions on healthy leaves, whereas conidia in water did not. Ozone-injured leaves of all cultivars showed lesions byB. cinerea after inoculations in water. The number of lesions was significantly correlated with ozone injury for primary leaves. After Pi inoculations, the number of lesions on the ozone-sensitive cultivars also increased with increasing ozone concentrations. However, the ozone-tolerant cultivar Groffy showed first a decrease in the Pistimulated infection at the lowest ozone dosages. The trifoliate leaves of all cultivars were less predisposed to the fungus than the primary leaves. The results indicate that realistic concentrations of ozone enhance the predisposition of bean leaves toB. cinerea. The rate of enhancement depends on the level of ozone-induced injury which was influenced by cultivar, leaf and ozone concentrations.
Samenvatting
De invloed van ozon op de vatbaarheid van boon voorBotrytis cinerea werd onderzocht. Een dag na de blootstelling van vier bonecultivars gedurende 8 uur aan 0, 120, 180 en 260 μg ozon m−3, werden primaire en drietallige bladeren geïnoculeerd met conidiën in water of in een anorganische fosfaatoplossing (Pi). Zichtbare beschadiging door ozon nam met de concentratie toe in alle cultivars. De primaire bladeren waren gevoeliger dan de drietallige. In tegenstelling tot conidiën in water, verooraakten conidiën in de Pi-oplossing lesies op gezonde bladeren. Bij ozonbeschadiging vertoonden bladeren van alle cultivars lesies doorB. cinerea na inoculatie in water. Voor primaire bladeren was het aantal lesies significant gecorreleard met de bladbeschadiging. Na Pi-inoculatie nam bij de ozongevoelige cultivars het aantal lesies ook toe met de concentratie ozon. Echter, de ozontolerante cultivar Groffy vertoonde eerst een afname in de door Pi gestimuleerde infectie bij de laagste ozonconcentratie. De door ozon verhoogde vatbaarheid van drietallige bladeren was minder dan die van primaire bladeren. De resultaten tonen aan dat realistische concentraties van ozon boon vatbaarder maken voorB. cinerea. Deze stijging in vatbaarheid is afhankelijk van het niveau van de ozonbeschadiging die wordt beïnvloed door cultivar, soort blad en ozonconcentratie.
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Leone, G., Tonneijck, A.E.G. Acute ozone exposure predispose Phaseolus vulgaris beans to botrytis cinerea. Netherlands Journal of Plant Pathology 96, 65–74 (1990). https://doi.org/10.1007/BF02005130
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DOI: https://doi.org/10.1007/BF02005130