小西葫芦黄花叶病毒外壳蛋白抗体制备

根据已报道的小西葫芦黄花叶病毒（ZYMV）序列设计特异引物,扩增ZYMV的全长外壳蛋白（CP）基因,插入原核表达载体pSBET后在大肠杆菌B121（DE3）plysS中诱导表达。通过12％SDS—PAGE和5％～20％梯度SDS—PAGE二次制备电泳纯化诱导产物,免疫小鼠,获得经过Western blot分析为特异的抗CP血清。硫酸铵沉淀法与ProteinA—Red Sepharose亲和层析相结合提取IgG,获得效价达1：4800的一抗,对西瓜和甜瓜田间样品的间接ELISA检测表明,ZYMV在田间普遍发生,研究制备的IgG可用于ZYMV检测。     

Spatiotemporal Dynamics of Zucchini Squash Lethal Chlorosis and its Relationship with the Frankliniella zucchini Population

Lethal chlorosis of cucurbits, caused by the tospovirus Zucchini lethal chlorosis virus (ZLCV), is an important disease in the Brazilian zucchini squash crop. The virus is transmitted by the thrips Frankliniella zucchini. Progress of the disease in time and space was studied in zucchini squash experimental fields to better understand disease epidemiology. Nine independent experiments were carried out between December 2006 and September 2010. The effects of the disease were assessed every 2–7 days, depending on the experiment. The thrips population was monitored in five of these experiments. For disease progress over time, four models (exponential, monomolecular, logistic and Gompertz) were tested. Disease progress in space analysis included both the index of dispersion and Taylor's power law. The monomolecular model was the best fit to the disease incidence data, and spatial analysis indicated aggregated diseased plants at the end of the season in most experiments. A correlation was detected between the number of collected thrips and the incidence of zucchini squash lethal chlorosis. The results indicate that the thrips population significantly contributed to the primary spread of disease incidence. We propose that disease management should focus mainly on the elimination of the source of the inoculum.     

Rearing Frankliniella zucchini Nakahara & Monteiro (Thysanoptera: Thripidae) on zucchini (Cucurbita pepo L. ‘Caserta’) fruits

Frankliniella zucchini transmits zucchini lethal chlorosis virus, causal agent of lethal chlorosis of zucchini squash. The characteristics of relationship between this virus with its vector have not been studied, one of the reasons being the lack of a method for rearing the thrips for laboratory studies. This work proposes a system for the rearing of F. zucchini on fresh virus free zucchini ‘Caserta’ fruits, offering a practical and efficient alternative for the supply of a large number of insects for later study of virus/vector relationship. In addition, to aid in the identification of this species of thrips, the immature and adult forms obtained from the colony were described.