Partial Resistance to Asian Soybean Rust in South Brazilian Soybean Cultivars: Genotypic Variation and Implications for Management

Partial Resistance to Asian Soybean Rust in South Brazilian Soybean Cultivars: Genotypic Variation and Implications for Management

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DOI 10.20900/cbgg20250013
刊名
CBGG
年,卷(期) 2025, 7(3)
作者
作者单位

Department of Plant Protection, Federal University of Pelotas, Avenida Eliseu Maciel, s/n°, Capão do Leão University Campus, Pelotas, RS 96010-900, Brazil ;

摘要
The state of Rio Grande do Sul (RS) is the third-largest soybean producer in Brazil. Over the past fifteen years, the cultivated area in the state has expanded by 65%, particularly in its southern region. To assess the partial resistance levels of different soybean cultivars to Asian soybean rust (ASR), this study was conducted under field conditions during two growing seasons (2013/14 and 2014/15), evaluating 22 cultivars in southern RS. Although all cultivars were susceptible to the pathogen, disease severity varied significantly among genotypes and between crop years. The highest ASR severity at the R5.3 growth stage was 76.7% in 2013/14 and reached 100% (complete defoliation) in 2014/15. In contrast, the lowest severity was observed in the cultivar TMG 7062 IPRO, with 4.3% in 2013/14 and 8.3% in 2014/15. These findings highlight substantial differences in the levels of partial resistance to ASR among soybean cultivars. In conclusion, the use of cultivars with higher levels of partial resistance represents a viable and reliable strategy for managing ASR in southern RS. However, in seasons with highly favorable environmental conditions for disease development, additional integrated disease management practices may be necessary for most cultivars.
Abstract
The state of Rio Grande do Sul (RS) is the third-largest soybean producer in Brazil. Over the past fifteen years, the cultivated area in the state has expanded by 65%, particularly in its southern region. To assess the partial resistance levels of different soybean cultivars to Asian soybean rust (ASR), this study was conducted under field conditions during two growing seasons (2013/14 and 2014/15), evaluating 22 cultivars in southern RS. Although all cultivars were susceptible to the pathogen, disease severity varied significantly among genotypes and between crop years. The highest ASR severity at the R5.3 growth stage was 76.7% in 2013/14 and reached 100% (complete defoliation) in 2014/15. In contrast, the lowest severity was observed in the cultivar TMG 7062 IPRO, with 4.3% in 2013/14 and 8.3% in 2014/15. These findings highlight substantial differences in the levels of partial resistance to ASR among soybean cultivars. In conclusion, the use of cultivars with higher levels of partial resistance represents a viable and reliable strategy for managing ASR in southern RS. However, in seasons with highly favorable environmental conditions for disease development, additional integrated disease management practices may be necessary for most cultivars.
关键词
Glycine max; Phakopsora pachyrhizi; integrated management; genetic resistance; partial resistance; disease control
KeyWord
Glycine max; Phakopsora pachyrhizi; integrated management; genetic resistance; partial resistance; disease control
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Paulo Cesar Pazdiora,Keilor da Rosa Dorneles,Thomas Natali Morello,Ihan Rebhahn,Jerônimo Vieira de Araújo Filho,Leandro José Dallagno*. Partial Resistance to Asian Soybean Rust in South Brazilian Soybean Cultivars: Genotypic Variation and Implications for Management [J]. Crop Breeding, Genetics and Genomics. 2025; 7; (3). - .

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