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Rice Resistance to Sheath Blight Mediated by Potassium
Author(s) -
Schurt Daniel Augusto,
Lopes Ueder Pedro,
Duarte Henrique Silva Silveira,
Rodrigues Fabrício Ávila
Publication year - 2015
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.12269
Subject(s) - sheath blight , rhizoctonia solani , inoculation , cultivar , biology , potassium , horticulture , lesion , nutrient , agronomy , chemistry , surgery , ecology , organic chemistry , medicine
This study investigated the effect of potassium (K) on sheath blight ( Rhizoctonia solani ) development on rice plants from cultivars BR ‐ IRGA 409 and Labelle grown in nutrient solution containing 0, 50 and 100 m m of K. Sheath blight progress on inoculated sheaths was evaluated by measuring the relative lesion length at 48, 72, 96 and 120 h after inoculation (hai). Data were used to calculate the area under relative lesion length progress curve ( AURLLPC ). The foliar K concentration on leaf sheaths tissue increased by 61.48 and 116.05% to cultivars BR ‐ IRGA 409 and Labelle, respectively, as the K rates increased from 0 to 100 m m . A linear model best described the relationship between the AURLLPC and the K rates. The AURLLPC decreased by 29.2 and 21.3% for cultivars BR ‐ IRGA 409 and Labelle, respectively, as the K rates in the nutrient solution increased. It can be concluded that high K concentration on leaf sheaths tissue was important to decrease sheath blight symptoms on rice leaf sheaths.

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