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A new root-knot nematode parasitising vegetables, flowers and fruits in Brazil,Iran and Chile, is described as Meloidogyne luci n. sp. Thefemale has an oval to squarish perineal pattern with a low to moderately highdorsal arc and without shoulders, similar to M. ethiopica. Thefemale stylet is robust and 15-16 μm long; the distance from thedorsal pharyngeal gland orifice to the stylet base (DGO) is3-4 μm. Males have a high, rounded head cap continuous with thebody contour. The labial disc is fused with the medial lips to form an elongatedlip structure. The head region is not marked by incomplete annulations. Malestylet robust, 20.8-23.0 μm long with rounded knobs; the DGO is2.5-4.5 μm. The stylet of second-stage juveniles (J2) is12.0-13.5 μm long and the DGO to the stylet base is2.3-3.3 μm. The J2 tail is conoid with finely rounded terminus andis 40.0-48.5 μm long. Biochemically, the esterase phenotype L3(Rm: 1.05,1.10, 1.25) is unique and is the most useful character to differentiateM. luci n. sp. from all other Meloidogynespecies. Reproduction is by mitotic parthenogenesis(2n = 42-46 chromosomes). In a differential host test,the population from Lavandula spica, Caxias do Sul, RS State,Brazil, reproduced on tomato cv. Rutgers, tobacco cv. NC95 and pepper cv.California Wonder. No reproduction occurred on watermelon cv. Charleston Gray,cotton cv. Deltapine 61 or peanut cv. Florunner. In Neighbour-Joining analysesof ITS and D2-D3 rRNA sequences, populations of M. luci n. sp.from Brazil, Chile and Iran clustered together and were clearly separated fromother Meloidogyne spp., thus confirming that all threepopulations are very similar and conspecific.
Nematology – Brill
Published: Feb 20, 2014
Keywords: description; esterase phenotype; flowers; fruits; morphology; morphometrics; molecular; new species; taxonomy; vegetables
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