Considering the occasional but increasing presence of corn stunt disease in the subtropical region of Argentina, the objective of this research was to devise an effective strategy to screen disease-resistant genotypes in the absence of high and constant natural pressures. To do so, the presence of antixenosis and antibiosis as components of resistance to vector Dalbulus maidis (DeLong 1923) as well as resistance to the pathogen Spiroplasma kunkelii (Whitcomb et al. 1986) under artificial inoculation conditions were investigated in four widely-distributed maize hybrids in Argentina. The hybrids shown differences in the levels of resistance and target organisms (either the insect vector or the pathogen). Antixenosis and antibiosis to D . maidis were observed in DK72-10. Resistance of DK79-10 to S . kunkelii was evidenced by a delayed onset of symptoms, and DKB390 was antixenotic to D . maidis and highly resistant to S . kunkelii . A good association was found between symptom severity and yield, but not between symptom severity and accumulation of pathogen S . kunkelii . In conclusion, the proposed methodology was efficacious and can aid the screening of resistant genotypes in breeding programs to reduce the impact of corn stunt disease, ensuring that hybrids with good resistance level will be planted by farmers whenever disease occurs.

中文翻译：

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玉米特技病抗性成分的表征

考虑到阿根廷亚热带地区玉米特技病偶尔但不断增加的存在，本研究的目的是设计一种有效的策略，以在没有高且恒定自然压力的情况下筛选抗病基因型。为此，在四个分布广泛的玉米中，研究了抗氧化性和抗生物性作为抗病媒Dalbulus maidis（DeLong 1923）以及对病原体Skiroplasma kunkelii（Whitcomb et al。1986）的抗性成分。阿根廷的杂种。杂种显示出抗性和目标生物（昆虫媒介或病原体）水平的差异。对D的抗菌和抗菌。在DK72-10中观察到少女。DK79-10对S的抗性。症状的延迟发作证明了kunkelii，而DKB390对D则有抗性。maidis且对S的抵抗力强。昆克里。在症状严重程度和产量之间发现了良好的关联，但在症状严重程度和病原体S的积累之间没有发现良好的关联。昆克里。总之，所提出的方法是有效的，并且可以帮助在育种计划中筛选抗性基因型，以减少玉米特技病害的影响，确保一旦发生病害，农民就可以种植具有良好抗性水平的杂种。