Diaporthe Caulivora: Agente Causal De Cancro Del Tallo Predominante en Cultivos De Soja Del Sudeste Bonaerense.

Abstract

Manuscrito recibido el 27 de julio de 2015 y aceptado para su publicación el 2 de febrero de 2016. RESUMENEl cancro del tallo (CTS) ha sido la enfermedad más destructiva de la soja en el sudeste de la provincia de Buenos Aires en los últimos ciclos agrícolas. Considerando la inserción actual del cultivo en los sistemas productivos de esta zona, que el CTS es una enfermedad prevalente y que Diaporthe caulivora (Dc) es el agente causal predominante en Argentina, es importante conocer la identidad del agente prevalente en el área. Los objetivos fueron reconocer por características morfológicas las especies del complejo Diaporthe/Phomopsis presentes en cultivos de soja, en los ciclos agrícolas 2010/11-2011/12-2012/13, y confirmar molecularmente mediante PCR-RFLP, que la especie predominante causante ABSTRACTDiaporthe caulivora: predominant causal agent of stem canker in soybean crops in the southeast of Buenos Aires province.Stem canker (SC) has been the most destructive disease of soybean in the southeast of Buenos Aires in the last agricultural cycles. Considering the current inclusion of the soybean in the production systems in this area, that the SC is a prevalent disease, and that Diaporthe caulivora (Dc) is the predominant causal agent in Argentina, it is important to know the identity of the agent prevalent in the area. The objectives of the study were to recognize by morphology the species of the Diaporthe/Phomopsis complex present in soybean crops during the agricultural cycles 2010/11-2011/12-2012/13, and confirmed using PCR-RFLP that the predominant species causing symptoms of SC was Dc. Out of 39 isolates, 61% corresponded to Dc, 26% to P. longicolla,

Improvement of growth and yield of soybean plants through the application of non-thermal plasmas to seeds with different health status

“…Diaporthe caulivora and D. aspalathi are the causal agents of the stem canker (CTS). D. sojae and D. longicolla cause pod and stem blight (TTV) and seed decay (DDS) (Grijalba et al., 2011; Grijalba and del Ridao, 2014; Sánchez et al., 2015; Li et al., 2016; Dissanayake et al., 2017). These fungi may survive unfavourable growth conditions as dormant mycelia within infected seeds, thus both, primary infections (Malvick, 1997; Grijalba and Ridao, 2012) as well as the spreading of the diseases to new areas (Singh and Mathur, 2004; Rossi and Ridao, 2011), result from their dissemination.…”

Current understanding of the Diaporthe/Phomopsis complex causing soybean stem canker: A focus on molecular aspects of the interaction

“…Recently, SSC, mainly caused by D . caulivora , has been one of the most destructive soybean diseases in South America, with a prevalence of 50%, 61% and 83% in Paraguay, Argentina and Uruguay, respectively (Sánchez et al., 2015; Stewart, 2015; Wrather et al., 1997). The presence of D .…”

“…In addition, interveinal chlorosis and necrosis of the leaves are frequently visible (Lu et al., 2010; Mena et al., 2020; Pioli et al., 2003). Severe infections lead to necrosis of the conductive vessels, which blocks the flow of water through the xylem leading to cell death in the upper portion of the stem and the death of the plant (Sánchez et al., 2015).…”

Effects of non‐thermal plasma technology on Diaporthe longicolla cultures and mechanisms involved

“…The Diaporthe/Phomopsis complex (D/P) is a group of phytopathogenic fungi that may affect soybean crop, causing significant economic losses, 1, 2 mostly associated with seed deterioration 3 . These fungi are known to be seed‐borne as they may colonize the internal tissues of seeds 4, 5 . In the field, initial infections may proceed either from sowing infected seeds or from spores in stubble that reach the plant via rain splashes 6 .…”

“…3 These fungi are known to be seed-borne as they may colonize the internal tissues of seeds. 4,5 In the field, initial infections may proceed either from sowing infected seeds or from spores in stubble that reach the plant via rain splashes. 6 Whenever rainy conditions delay normal harvest, the diseases caused by this complex may reduce seed weight by 10% and germination by 50%.…”