Thi Thu Cuc Nguyen, Pilon Marc
Cantho University, College of Agriculture and Applied Biology, Department of Plant Protection, 3/2 street, Can Tho City, Vietnam Department of Cell and Molecular Biology, Göteborg University, S-405 30 Göteborg, Sweden.
J Nematol. 2007 Sep;39(3):248-57.
Polianthes tuberosa is a commercially valuable flower crop in the Mekong Delta of Vietnam that is propagated by the harvesting and planting of bulbs. The cultivation of P. tuberosa is complicated by an endemic nematode infection that damages a high proportion of the plants. Based on morphological criteria and ribosomal RNA gene sequencing, we have determined that the infection is caused by an Aphelenchoides sp. nematode and is most likely Aphelenchoides besseyi. By scoring various parts of harvested plants with flowers for the presence of viable nematodes over a period of six months, we determined that the nematode is an ectoparasite that can survive the intercrop periods, especially in the bulbs that are used to plant new crops. A comparison of farming practices in the Mekong Delta failed to identify useful control methods, but rather indicated that fields that have cultivated P. tuberosa for the longest periods suffer the worst damage from the nematode infection. Finally, we demonstrated that the nematode is capable of infecting 30 rice cultivars but does not cause the white tip disease usually associated with A. besseyi infection.
晚香玉是越南湄公河三角洲一种具有商业价值的花卉作物，通过收获和种植球茎进行繁殖。晚香玉的种植因一种地方性线虫感染而变得复杂，这种感染会损害很大比例的植株。基于形态学标准和核糖体RNA基因测序，我们确定这种感染是由一种滑刃线虫属线虫引起的，很可能是贝西滑刃线虫。通过在六个月的时间里对收获的带花植株的各个部位进行评分，以确定是否存在存活的线虫，我们确定这种线虫是一种外寄生线虫，能够在间作期存活下来，尤其是在用于种植新作物的球茎中。对湄公河三角洲的种植实践进行比较，未能找到有效的防治方法，反而表明种植晚香玉时间最长的田地受线虫感染的损害最严重。最后，我们证明这种线虫能够感染30个水稻品种，但不会引发通常与贝西滑刃线虫感染相关的白尖病。
