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Effect of Zinc on the Development of Brown Spot in Rice
Author(s) -
Moreira Wiler R.,
Rodrigues Fabrício Avila,
Duarte Henrique Silva Silveira
Publication year - 2013
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12125
Subject(s) - biology , brown rice , zinc , inoculation , horticulture , micronutrient , leaf spot , linear regression , linear correlation , fungus , botany , food science , chemistry , mathematics , statistics , organic chemistry
Brown spot, caused by the fungus B ipolaris oryzae , is one of the most destructive diseases of rice. This study investigated the effect of zinc rates on the development of brown spot in rice. Rice plants (cv. ‘ M etica‐1′) were grown in hydroponic culture amended with Zn rates (applied as Z n SO 4 . 7 H 2 O ) of 0, 0.5, 1, 2 and 4 μ m and inoculated with B . oryzae . The foliar concentration of Z n was determined. Leaf samples were assessed for disease severity, and then, area under brown spot progress curve ( AUBSPC ) was calculated. The relationship between Z n concentrations on leaf tissues and the rates of this micronutrient was best described by a positive linear regression model, while the relationship between the Z n rates and the AUBSPC was best described with a positive quadratic regression model. The correlation between Z n concentrations on leaf tissues and AUBSPC was positive and significant ( r = 0.68, P < 0.05). The results from this study showed that high foliar concentration of Z n was associated with increasing rice susceptibility to brown spot.