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Coffea arabica rootstock resistant to Meloidogyne paranaensis nematodes
Crop Science ( IF 2.3 ) Pub Date : 2022-01-14 , DOI: 10.1002/csc2.20707
Lillian Magalhães Azevedo 1 , Francisco Hélio Alves de Andrade 1 , Lermen Forigua 1 , Jacqueline Oliveira dos Santos 2 , Paulo Victor Magalhães Pacheco 3 , Paulo Eduardo Ribeiro Marchiori 1 , Evaristo Mauro de Castro 4 , Gladyston Rodrigues Carvalho 5 , Sônia Maria de Lima Salgado 5 , Vania Aparecida Silva 5
Affiliation  

Meloidogyne paranaensis is a species of root-knot nematode that affects coffee (Coffea arabica L.) tree growth by causing severe damages to the plant root. This study evaluated the agronomic performance of Coffea arabica progenies in an M. paranaensis-infested field and assessed the compatibility of resistant C. arabica genotype 28-I-4 (GEN28) as rootstock for susceptible cultivars. Experiment 1: under field conditions, six progenies were analyzed; the controls were ‘IPR100’ as resistant and ‘Catuaí Vermelho IAC 144’ (CtV144) as susceptible. Experiment 2: under greenhouse conditions, combinations of grafts and rootstocks between susceptible CtV144 and GEN28 were evaluated regarding their resistance to M. paranaensis alongside their noninoculated counterparts. For this, M. paranaensis reproduction factor (RF), total population of the nematode per gram of root system, growth parameters, gas exchange, and water potential (ψpd) were evaluated. In Experiment 1, resistant C. arabica progenies were more vigorous, productive, and showed a population of M. paranaensis threefold-times lower than that observed in roots of susceptible CtV144. Among the resistant progenies selected in the field experiment, GEN28 was chosen for physiological compatibility study with the traditional cultivar CtV144. In Experiment 2, the CtV144 grafted onto GEN28 led to resistance to M. paranaensis, as well as a higher leaf area and ψpd as compared with nongrafted CtV144. Therefore, the GEN28 holds suitable characteristics to be used as a new Coffea arabica rootstock applied to production of resistant seedlings to Meloidogyne paranaensis nematodes. This technology represents an alternative to keep up coffee activity in infested areas.

中文翻译:

抗根结线虫的小粒咖啡砧木

巴拉那根结线虫是一种根结线虫,通过对植物根部造成严重损害来影响咖啡 ( Coffea arabica L.) 树的生长。这项研究评估了阿拉比卡氏菌侵染田地中阿拉比卡咖啡后代的农艺性能,并评估了抗性阿拉比卡咖啡基因型 28-I-4 ( GEN28 ) 作为易感栽培品种砧木的相容性。实验1:在田间条件下,分析了6个后代;对照是“IPR100”为耐药,“Catuaí Vermelho IAC 144”(CtV144)为易感。实验 2:在温室条件下,评估易感 CtV144 和 GEN28 之间的嫁接和砧木组合的抗性M. paranaensis与未接种的对应物一起。为此,评估了M. paranaensis繁殖因子 (RF)、每克根系的线虫总数、生长参数、气体交换和水势 (ψ pd )。在实验 1 中,抗性C. arabica后代更有活力和生产力,并且显示出比易感 CtV144 根中观察到的M. paranaensis种群低三倍。在田间试验选择的抗性后代中,选择GEN28与传统品种CtV144进行生理相容性研究。在实验 2 中,移植到 GEN28 上的 CtV144 导致了对M. paranaensis的抗性,以及与未嫁接的 CtV144 相比更高的叶面积和 ψ pd 。因此,GEN28具有适宜的特性,可作为一种新的小粒咖啡砧木,用于生产对巴拉纳根结线虫的抗性幼苗。这项技术代表了在受感染地区保持咖啡活动的替代方案。
更新日期:2022-01-14
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