Tropical Plant Pathology (2009) 34, 385-392

Ricardo Contreira Lessin and Raquel Ghini (2009)
Efeito do aumento da concentração de CO₂ atmosférico sobre o oídio e o crescimento de plantas de soja
[Effect of increased atmospheric CO₂ concentration on powdery mildew and growth of soybean plants]
Tropical Plant Pathology 34 (6), 385-392
Abstract: The increase in the concentration of atmospheric carbon dioxide (CO₂) due to human activities can affect morphology and physiological processes in plants, as well as the cycle of the pathogens and their interaction with hosts. This study focused on evaluating the effect of high concentrations of atmospheric CO₂ on the severity of powdery mildew (Microsphaera diffusa), and on the growth and nodulation of soybean. The experiment was conducted in open-top chambers (OTC) with and without CO₂ injection, including a control with no OTC, corresponding, on average, to concentrations of 504 ppm, 429 ppm and 424 ppm, respectively, during the day. For 83 days, four soybean cultivars with different levels of resistance to powdery mildew were evaluated: FT-Estrela (highly susceptible), Embrapa 48 (susceptible), FT-Cometa (moderately resistant) and FT-5 (Formosa) (resistant). The increase of CO₂ concentration resulted in increased disease severity of the four cultivars analyzed together, but there was no effect on pathogen sporulation. Furthermore, there was an increase in height, dry weight of roots and nodulation by Bradyrhizobium spp., except in Formosa cultivar. However, the dry mass of canopy did not differ significantly with increasing concentration of CO₂. The development of the disease and the plant growth were higher in OTCs than outside them. The results show that increasing CO₂ concentration affects the disease and there are differences in the responses among cultivars.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Raquel Ghini

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Erysiphe diffusa	Soybean (Glycine max)