Sources of root-knot nematode (Meloidogyne enterolobii) resistance in sweetpotato genotypes

IF 0.7 4区农林科学 Q4 HORTICULTURE

Horticultura Brasileira Pub Date : 2023-05-29 DOI:10.1590/s0102-0536-2023-e2588

Thávio Júnior B Pinto, G. Silva, L. Vendrame, J. Pinheiro, L. A. Santos, Dwillian F Cunha, R. A. Melo, J. Cares

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Abstract

ABSTRACT The root-knot nematode (RKN) Meloidogyne enterolobii is gaining importance all around the world, including Brazil, damaging sweetpotato genotypes with known resistance to other RKN species, making it challenging to generate new resistant genes. This study aimed to assess the levels of resistance of 10 advanced sweetpotato cultivars to this nematode species. Two experiments were carried out in 2018/2019 and 2021/2022 seasons, under greenhouse conditions in Brasília-DF, Brazil. A completely randomized block design with six replicates of one plant/plot/treatment was used. The gall index (GI) and egg mass index (EMI) in the root system of each plant, the number of eggs and juveniles per gram of root with galls (NERG), and the nematode reproduction factor (RF) were determined. M. enterolobii resistance is present within three of the evaluated clones: BGBD 1399, MD 1609024, and MD 1610036, therefore demonstrating their potential as sources of resistance genes to assist breeding efforts to release cultivars, and help to reduce the impact and spread of this RKN.

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甘薯基因型根结线虫(Meloidogyne enterolobii)抗性的来源

肠根结线虫(Meloidogyne enterolobii)在包括巴西在内的世界各地变得越来越重要，它破坏了已知对其他RKN物种具有抗性的甘薯基因型，这使得产生新的抗性基因变得具有挑战性。本研究旨在评价10个高级甘薯品种对该线虫的抗性水平。两项试验分别于2018/2019和2021/2022季节在巴西Brasília-DF的温室条件下进行。采用完全随机区组设计，每株/样地/处理6个重复。测定了各植株根系的虫瘿指数(GI)和虫卵质量指数(EMI)，每克含虫瘿根的虫卵数和幼虫数(NERG)以及线虫繁殖因子(RF)。在三个被评估的克隆中，即BGBD 1399、MD 1609024和MD 1610036均存在肠肠杆菌抗性，因此表明它们作为抗性基因来源的潜力，有助于育种工作释放栽培品种，并有助于减少该RKN的影响和传播。

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来源期刊

Horticultura Brasileira 农林科学-园艺

CiteScore

1.40

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal Horticultura Brasileira, a quarterly journal, is the Official Publication of the Sociedade de Olericultura do Brasil. Its abbreviated title is Hortic. bras., and it should be used in bibliographies, footnotes, references and bibliographic strips.