Resistance of Bt and Non-Bt Soybean Cultivars Adapted to Novel Growing Regions of Brazil to Chrysodeixis includens and Spodoptera frugiperda.

IF 1.4 3区 农林科学 Q2 ENTOMOLOGY Neotropical Entomology Pub Date : 2024-12-01 Epub Date: 2024-09-25 DOI:10.1007/s13744-024-01208-8
Larah M Freitas, Bruno H S Souza, Fernanda S Ferreira, Ana P A Antunes, Adriano T Bruzi
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Abstract

Soybean is a highly valuable commodity crop for Brazil's economy. However, it faces significant threats from the attack of a complex of lepidopteran pests, particularly Chrysodeixis includens (Walker) and Spodoptera frugiperda (J. E. Smith). These pests have been managed primarily using transgenic Bt soybeans, but limited knowledge exists about the resistance levels of Bt and non-Bt cultivars adapted to novel soybean-growing areas in Brazil, such as the Minas Gerais state. This study evaluated the resistance levels of Bt and non-Bt soybean cultivars to C. includens and S. frugiperda, and whether the Bt cultivars can differentially affect these pests across larval stages. No-choice bioassays were conducted using Bt (NS6010 IPRO and P97R50 IPRO) and non-Bt soybeans (UFLA 6301 RR, P96R90 RR, and ANsc 80111 RR) at V4-stage in the laboratory with neonate (24 h) and third-instar larvae. Larvae were fed leaf discs in Petri dishes, recording the mortality, leaf consumption, and weight gain after 7 days. There was high mortality of C. includens neonates on the Bt cultivars, but this trend was not observed for older larvae. For S. frugiperda neonates, there was high mortality on the Bt cultivar NS 6010 IPRO and non-Bt cultivar UFLA 6301 RR, but only the former was effective for older larvae. Although the Bt cultivars did not kill the third instars, antinutritional effects were found, such that leaf tissue consumed was not converted to larval weight gain. These findings are important for defining regional strategies of integrated and resistance management of C. includens and S. frugiperda in expanding regions of soybean cultivation in Brazil.

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适应巴西新种植区的 Bt 和非 Bt 大豆品种对 Chrysodeixis includens 和 Spodoptera frugiperda 的抗性。
大豆是巴西经济中极具价值的商品作物。然而,大豆面临着鳞翅目害虫群的严重威胁,特别是 Chrysodeixis includens (Walker) 和 Spodoptera frugiperda (J. E. Smith)。这些害虫主要通过转基因 Bt 大豆进行防治,但对巴西米纳斯吉拉斯州等新大豆种植区的 Bt 和非 Bt 栽培品种的抗性水平了解有限。本研究评估了 Bt 和非 Bt 大豆栽培品种对 C. includens 和 S. frugiperda 的抗性水平,以及 Bt 栽培品种是否能在不同幼虫阶段对这些害虫产生不同影响。在实验室使用 Bt 大豆(NS6010 IPRO 和 P97R50 IPRO)和非 Bt 大豆(UFLA 6301 RR、P96R90 RR 和 ANsc 80111 RR)进行无选择生物测定,幼虫为 V4 阶段的新生幼虫(24 小时)和三龄幼虫。幼虫在培养皿中喂食叶片,7 天后记录死亡率、叶片消耗量和体重增加情况。在 Bt 栽培品种上,C. includeens 初孵幼虫的死亡率很高,但在老龄幼虫上没有观察到这种趋势。对于 S. frugiperda 新生幼虫,Bt 栽培品种 NS 6010 IPRO 和非 Bt 栽培品种 UFLA 6301 RR 的死亡率都很高,但只有前者对大龄幼虫有效。虽然 Bt 栽培品种没有杀死第三龄幼虫,但发现了抗营养效应,即消耗的叶片组织不能转化为幼虫的增重。这些发现对于在巴西不断扩大的大豆种植区确定 C. includens 和 S. frugiperda 的综合抗性管理区域战略非常重要。
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来源期刊
Neotropical Entomology
Neotropical Entomology 生物-昆虫学
CiteScore
3.30
自引率
5.60%
发文量
69
审稿时长
6-12 weeks
期刊介绍: Neotropical Entomology is a bimonthly journal, edited by the Sociedade Entomológica do Brasil (Entomological Society of Brazil) that publishes original articles produced by Brazilian and international experts in several subspecialties of entomology. These include bionomics, systematics, morphology, physiology, behavior, ecology, biological control, crop protection and acarology.
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