Identification of irrigated rice genotypes resistant to burning of sheaths in the state of Tocantins

Authors

DOI:

https://doi.org/10.20873/pibic2022_3%20

Abstract

ABSTRACT

The burning of the sheaths, caused by the fungus Rhizoctonia solani is a disease of extreme importance and difficult to manage because it is a fungus living in soil, which produces resistance structure called scledes, causing losses of up to 50% in rice crop. The objective of this work was to evaluate the resistance of 20 genotypes of irrigated rice at sheath burning, under field conditions and in a greenhouse. Disease severity assessments were performed using a scale of scores from 0 to 9. In the field, the BRS Pampeira genotype was more resistant to the disease, with an average area below the Disease Progress Curve (AACPD) of 68.25%. There was a statistical difference compared to genotypes AB191186 and AB191157, which obtained the highest values of AACPD corresponding to 98.25% and 107.63%, respectively, evidencing the high susceptibility of both to the burning of the sheaths. Under controlled conditions, BRS A705 remained more resistant, having an AACPD of 22.13%, but did not statistically deposition the BRS Pampeira. The genotypes AB191186 and AB191157 maintained high susceptibility to the disease under controlled conditions.

Keywords: Oryza sativa, tolerance, Rhizoctonia solani.

Published

2023-04-28

How to Cite

Lima, V., Rodrigues, G., & Ricardo, P. (2023). Identification of irrigated rice genotypes resistant to burning of sheaths in the state of Tocantins. DESAFIOS - Revista Interdisciplinar Da Universidade Federal Do Tocantins, 10(Especial 1). https://doi.org/10.20873/pibic2022_3