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- W4385797997 abstract "Pitaya (Selenicereus costaricensis), a tropical and subtropical fruit of Cactaceae family, become very popular in the fruit consumer market in recent years. In June 2022, plant stunting, reduced yields and galled root symptoms were observed on S. costaricensis plants sampled from a commercial production base in Wuming County (23°10′36.67″ N; 108°40′43.24″ E), Guangxi autonomous region, China. The area of S. costaricensis field we investigated was about 19.9 ha. The incidence of root-knot nematode disease was almost 60%. Roots of twenty S. costaricensis plants were dug up, and many root knots and egg masses were observed. The roots with galls were collected, nematodes at different stages were collected and morphologically identified. Females were annulated, pearly white and globular to pear-shaped. The perineal pattern was oval shaped with the dorsal arch being moderately high to high. Average length of adult females (n = 20): body = 614.4 ± 57.3 μm, stylet lengths = 15.1 ± 0.9 μm, dorsal esophageal gland orifice (DGO) = 4.7 ± 0.6 μm. The tail of the second stage juvenile (J2) was very thin with a bluntly pointed tip. The hyaline tail terminus was clearly defined. Average length of J2 (n = 20): body = 469.5 ± 36.7 μm, stylet lengths = 14.7 ± 0.5 μm, DGO = 3.5 ± 0.4 μm, tail lengths averaged = 43.6 ± 9.7 μm. The males were vermiform, annulated, slightly tapering anteriorly, bluntly rounded posteriorly. Typical characteristics of Meloidogyne enterolobii observed were consistent with those previously described by Yang & Eisenback (1983) and Bulletin (2016). J2s hatched from an individual egg mass were collected for DNA extraction and used for molecular biological identification. The specific primers of M. enterolobii, Me-F/Me-R (AACTTTTGTGAAAGTGCCGCTG/TCAGTTCAGGCAGGATCAACC), was used to validate the pathogen (Long et al. 2006). Approximately 236 bp of the target product was amplified, whereas no product was obtained from M. incognita. Further, the rDNA gene sequences (ITS; ITS1_5.8S_ITS2) and large subunit rDNA gene were amplified by the primers V5367/26S (TTGATTACGTCCCTGCCCTTT/TTTCACTCGCCGTTACTAAGG) (Vrain et al. 1992) and D2A/D3B (ACAAGTACCGTGAGGGAAAGT/TCGGAAGGAACCAGCTACTA), respectively (Subbotin et al. 2006). The target sequences of 765 bp (GenBank accession no. OQ512155) and 759 bp (OQ512743) were recorded in the NCBI with GeneBank. The sequences showed 100% identity with M. enterolobii in ITSs (KJ146863, JQ082448) and D2/D3 (MF467276, OL681885). To verify reproduction on S. costaricensis (Jindu 1), twelve ten-week-old seedlings (12 pots) cultured on a sterile substrate soil were inoculated with 5,000 J2s from the original population in a greenhouse at 26 ˚C. Noninoculated control were set up at the same time. After 8 weeks, the noninoculated plants (n = 12) did not present galls in the roots. All inoculated plants had galled roots and showed dwarf plant. The average reproductive factor obtained was 11.6 and the mean root gall rating of the samples was 5.3 (rating scale of 0 to 10), confirming the pathogenicity of M. enterolobii to S. costaricensis. The red dragon fruits (Hylocereus polyrhizus) in Hainan Island (China) were reported infected by M. enterolobii in previous report (Long et al. 2022). To our knowledge, this is the first report of M. enterolobii parasitizing S. costaricensis in Guangxi, China. This finding has important implications for the control of M. enterolobii at the place of discovery, which is the major fruit production area." @default.
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- W4385797997 date "2023-08-14" @default.
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- W4385797997 title "First Report of the guava root-knot nematode (Meloidogyne enterolobii) on Selenicereus costaricensis in Guangxi, China" @default.
- W4385797997 doi "https://doi.org/10.1094/pdis-04-23-0736-pdn" @default.
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