Penetration and post-infection development of root-knot nematodes in watermelon

Spanish Journal of Agricultural Research

Manuel López-Gómez¹ 

[1] Instituto de Investigación y Formación Agraria y Pesquera (IFAPA), Centro La Mojonera. Camino de San Nicolás no. 1. 04745 La Mojonera, Almería

关键词: Citrullus lanatus;    growth stimulation;    Meloidogyne arenaria;    Meloidogyne incognita;    Meloidogyne javanica;    parasitic variation;    reproduction factor;   

DOI  :  10.5424/sjar/2017154-11189

学科分类：农业科学（综合）

来源: I N I A

【 摘 要 】

Meloidogyne javanicahas showed less reproductive success thanM .incognitain watermelon genotypes. This study was conducted to elucidate the low reproduction ofM. javanicain watermelon. The post-infection development ofM. javanicain watermelon ‘Sugar Baby’ was determined at progressively higher initial population (Pi) levels at two time points during the life cycle. Plants were inoculated with 0, 25, 50, 100, 200, and 300 second-stage juveniles (J2)/plant. The increase in Pi was correlated with the penetration rates ( R 2= 0.603,p <0.001) and total numbers of nematodes in the root ( R 2 =0.963,p < 0.001) but there was no correlation between the Pi and the reproduction factor (eggs/plant/Pi). The population in the roots at 26 days post-inoculation (dpi) consisted primarily of third-stage juveniles (J3) with a small presence of J2 and fourth stages, and egg-laying females. The dominance of the J3, when egg-laying females are expected, point to the malfunction of the feeding sites that failed to support nematode development beyond the J3 stage. The similarities in egg-laying females at 26 and 60 dpi imply the disruption of the life cycle. Watermelon compensated forM. javanicaparasitism by increasing vine length (19% to 33%) and dry top weight (40%) in comparison with the non-inoculated plants. The area under the vine length progress curve was significantly larger as the Pi progressively increased ( R² =0.417,p <0.001). Physiological variation was detected between theM. incognitapopulations.M. arenariahad less ability to invade watermelon roots than didM. incognitaandM. javanica .

【 授权许可】

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