Nematicidal Activity of a Biopolymer Chitosan at Different Molecular Weights against Root-Knot Nematode, Meloidogyne incognita
Nematicidal Activity of a Biopolymer Chitosan at Different Molecular Weights against Root-Knot Nematode, Meloidogyne incognita
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DOI：
10.17221/46/2011-pps
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发表时间：
2012-12-01
影响因子：
1.3
通讯作者：
Badawy, Mohamed E. I.
中科院分区：
文献类型：
--
作者：
Khalil, Mohamed S.;Badawy, Mohamed E. I.
KHALIL M.S.，BADAWY M.E.I.（2012）：不同分子量的生物聚合物壳聚糖对根结线虫（Meloidogyne incognita）的杀线虫活性。植物保护。科学，四十八：170- 178.在体外和盆栽实验中测定了四种分子量（2.27 × 10（5）、3.60 × 10（5）、5.97 × 10（5）和9.47 × 10（5）g/mol）的生物聚合物壳聚糖对根结线虫南方根结线虫的杀线虫活性。在实验室测定中，线虫死亡率显着影响暴露时间和壳聚糖分子量。低分子量壳聚糖（2.27 × 105 g/mol）是最有效的杀线虫与EC 50的283.47和124.90 mg/l后，分别处理24和48小时。在温室生物测定中，与未处理的对照相比，所有化合物以LC 50值的1倍和5倍浓度混合在土壤中显著降低了番茄幼苗的种群、卵质量和根瘿。一般而言，这些化合物的杀线虫活性随着分子量的降低而显著增加。结果表明，低分子量壳聚糖有可能作为天然杀线虫剂。
KHALIL M.S., BADAWY M.E.I. (2012): Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita. Plant Protect. Sci., 48: 170-178.The nematicidal activity of four molecular weights (2.27 x 10(5), 3.60 x 10(5), 5.97 x 10(5), and 9.47 x 10(5) g/mol) of a biopolymer chitosan was assayed against the root-knot nematode, Meloidogyne incognita, in vitro and in pot experiments. In laboratory assays, the nematode mortality was significantly influenced by exposure times and chitosan molecular weight. Low molecular weight chitosan (2.27 x 105 g/mol) was the most effective in killing the nematode with EC50 of 283.47 and 124.90 mg/l after 24 and 48 h of treatment, respectively. In a greenhouse bioassay, all the compounds mixed in soil at one- and five-fold concentrations of the LC50 value significantly reduced population, egg mass, and root galling of tomato seedlings compared with the untreated control. In general, the nematicidal activity of these compounds was increased dramatically with a decrease in the molecular weight. The results suggest that the chitosan at low molecular weight may serve as a natural nematicide.