Magnesium-induced alterations in the photosynthetic performance and resistance of rice plants infected with Bipolaris oryzae
DOI:
https://doi.org/10.1590/0103-9016-2014-0312Abstract
Brown spot (BS), caused by the fungus Bipolaris oryzae, is one of the most important diseases contracted by rice. We investigated the effect of magnesium (Mg) on the development of BS, caused by Bipolaris oryzae, and the effects of disease development on the photosynthetic performance of rice (Oryza sativa L.) plants (cv. Metica-1) grown in nutrient solutions containing 0.25 or 4.0 mM of Mg. Assessments of BS severity, leaf Mg and pigment concentrations (total chlorophylls and carotenoids), were carried out at 120 h after inoculation, in addition to gas exchange parameters,. Higher leaf concentration of Mg was observed in plants supplied with 4.0 mM Mg than in those supplied with 0.25 mM. The increase in leaf Mg was accompanied by a decrease in BS severity, higher concentration of total chlorophyll and better photosynthetic performance. Plants supplied with 4.0 mM Mg had higher average values for carbon assimilation, stomatal conductance and internal leaf CO2 concentration when compared with plants supplied with 0.25 mM Mg. Conversely, the concentration of carotenoids was lower in plants supplied with the higher Mg rate. These results suggest that Mg suppresses disease severity and preserves photosynthetic performance by allowing for better stomatal conductance and, consequently, greater availability of CO2 at the carboxylation sites.Downloads
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Published
2015-08-01
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Plant Pathology
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Magnesium-induced alterations in the photosynthetic performance and resistance of rice plants infected with Bipolaris oryzae . (2015). Scientia Agricola, 72(4), 328-333. https://doi.org/10.1590/0103-9016-2014-0312