Trichoderma reduces scald and protects the photosynthetic apparatus in rice plants
2017
Bueno, A. C. S. O. | Castro, G. L. S. | Rêgo, M. C. F. | Batista, T. F. V. | Filippi, M. C. C. | da Silva, G. B.
Scald reduces the photosynthetic area, causing yield losses in rice. Changes in gas exchange parameters caused by the pathogen begin before the onset of symptoms. Chemical methods are most commonly applied to control this disease; further research into biological control methods is required. Since Trichoderma asperellum induces plant pathogen defences, increases growth, and improves photosynthetic capability, this study investigated the efficacy of T. asperellum (Ufra T06, UfraT09, Ufra T12, and Ufra T52 (Ta)) in reducing the scald lesion size and the area under the disease progress curve and in minimising the negative effects of scald on gas exchange, chlorophyll a fluorescence, chlorophyll content, and oxidative stress enzyme activity. The experiment was a completely randomised design with five replications and two treatments. Scald was reduced by 62% in plants treated with T. asperellum compared with that in control. There was a 62% increase in the net CO ₂ assimilation rate (A) and a drop of 78% in the transpiration rate (E) in plants treated with T. asperellum . The maximum fluorescence (F ₘ) was 128% higher, and ascorbate peroxidase activity was also higher in plants treated with T. asperellum than in the control. This shows that the use of T. asperellum may be effective in improving the sustainability of the integrated management of rice diseases.
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