Effect of Magnesium on the Development of Sheath blight in Rice

Abstract

This study investigated the effect of magnesium (Mg) on sheath blight, caused by Rhizoctonia solani, development on rice plants from cultivars BR-IRGA 409 and Labelle grown in nutrient solution containing 0.062, 0.125, 0.25 and 0.50 mM of Mg. Sheath blight progress on inoculated sheaths was evaluated by measuring lesions expansion (mm) at 24, 48, 72 and 96 h after inoculation. Data were used to calculate the area under lesion expansion progress curve (AULEPC). The relationship between the foliar Mg concentration and the Mg rates was quadratic. The Mg concentration on leaf sheaths tissue was highest at the Mg rates of 0.389 and 0.400 mM, respectively, for cultivars BR-IRGA 409 and Labelle. A linear model best described the relationship between the AULEPC and the Mg rates. The AULEPC decreased by 48.7 and 26.2% for plants of cultivars BR-IRGA 409 and Labelle, respectively, as the Mg rates in the nutrient solution increased. The results permitted to conclude that high foliar Mg concentration played a pivotal role to decrease sheath blight lesions expansion.

Nondestructive diagnostics of magnesium deficiency based on distribution features of chlorophyll concentrations map on cucumber leaf

“…Low level of Mg supplement often result in low chlorophyll production, which drastically impact the plant growth, flowering and fruit bearing (Farhat et al, 2016;Farzadfar et al, 2017;Saghaiesh et al, 2019). Moreover, Mg shortage also affects the production of chemical components that are connected with the product qualities, like appearance, aroma, taste and nutrition (Canizella et al, 2015;Gomez-Perez et al, 2018;Nikolic et al, 2014;Schurt et al, 2014). Although Mg deficiency diagnostics methods based on the Mg element content analysis with chemical methods, like inductively coupled plasma mass spectrometry, get good performance for diagnosing Mg deficient plants, the chemical analysis process is time-consuming, laborious and high cost (Guo et al, 2016;Nartvaranant, 2018).…”