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Effects of sulphur dioxide on leaf photosynthesis: the role of temperature and humidity (1990)

Kropff, M. J. ; Smeets, W. L. M. ; Meijer, E. M. J. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 80 (1990), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The effect of temperature and humidity on SO2–induced photosynthetic depression was determined in gas exchange experiments with leaves of Vicia faba, L. Stomatal behaviour was sensitive to humidity resulting in higher uptake rates of SO2 and stronger reductions of photosynthesis at low VPD (vapour pressure deficit). After a fumigation period of 2 h, when the photosynthetic rate had stabilized, photosynthesis of leaves exposed to SO2 at 8°C was reduced much more than at 18°C at the same rate of SO2 uptake. Data analysis with a mechanistic model revealed that this effect was due to the slower rate of S(IV) oxidation at lower temperatures, resulting in higher accumulation of S(IV) and thus stronger reduction of photosynthesis. These results were confirmed by experimental analyses of the S(IV) concentration in leaves following fumigation, which showed that more S(IV) accumulated in leaves exposed at a lower temperature. This may explain the high sensitivity of plants exposed to SO2 under winter conditions, when both VPD and temperature are low.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1990.tb05693.x

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Quantification of microsclerotia ofVerticillium dahliae in plant material by image analysis (1995)

Mol, L. ; Meijer, E. M. J.

Springer

European journal of plant pathology 101 (1995), S. 705-709

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ISSN: 1573-8469

Keywords: image analysis ; microsclerotia ; potato ; Solanum tuberosum ; Verticillium dahliae

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract A procedure for the quantification of microsclerotia ofVerticillium dahliae with an image analysis system was compared with counting by eye. Colonised potato plant material was used from plants grown in pathogen-free soil in a greenhouse and from twelve crops (including four potato cultivars) grown outdoors in pots filled with pathogen-free soil under natural conditions. The values obtained from the potato material from the greenhouse were comparable for both methods. Variation in the results mainly resulted from sampling errors. The numbers of microsclerotia in plants grown outdoors were overestimated by image analysis for most crops. The source of the error was related to the presence of plant and soil particles that did not discolour during boiling of the samples in sodium hydroxide. Image analysis was a suitable and reliable method for assessing the number of microsclerotia only in potato haulm samples from plants grown in pathogen-free soil in the greenhouse.