AbstractEsterase banding patterns in native polyacrylamide gel electrophoresis, squash silver leaf (SSL) induction, and tomato yellow leaf curl begomovirus-Sardinia (TYLCV-Sar) transmission capability were investigated to evaluate variations among populations of Bemisia tabaci (Gennadius) from Italy and to relate their distribution to their geographic origin. Adults of the B biotype, adults of the Q-like biotype (which is similar to a Spanish biotype), and adults without esterase bands were found. The B biotype has been found in Italy since 1989. Two populations, including mainly B and Q-like biotypes, showed similar TYLCV-Sar transmission efficiency, independent of esterase banding pattern. Only populations from Liguria and Sardinia, which contained almost exclusively B-biotype individuals, were able to induce SSL. We observed that adults of the B biotype are widespread in greenhouses of northern Italy and Sardinia, whereas those of the Q-like biotype are present only in fields of southern Italy. These results suggest that the B biotype of B. tabaci was introduced into Italy likely while trading ornamental plants, whereas the Q-like biotype is native to the Mediterranean region.
摘要 研究了原生聚丙烯酰胺凝胶电泳中的酯酶条带模式、南瓜银叶(SSL)诱导和番茄黄卷叶病begomovirus-撒丁岛(TYLCV-Sar)传播能力,以评估来自意大利的Bemisia tabaci(Gennadius)种群之间的差异,并将其分布与其地理起源联系起来。研究发现了 B 型生物型成虫、Q 型生物型成虫(类似于西班牙生物型)和无酯酶带的成虫。B 生物型自 1989 年起在意大利发现。两个种群(主要包括 B 型和 Q 型生物型)显示出相似的 TYLCV-Sar 传播效率,与酯酶条带模式无关。只有来自利古里亚(Liguria)和撒丁岛(Sardinia)的种群能够诱发 SSL,这两个种群几乎只包含 B 型生物型个体。我们观察到,B 生物型的成虫广泛存在于意大利北部和撒丁岛的温室中,而 Q 型生物型的成虫只存在于意大利南部的田野中。这些结果表明,B. tabaci 的 B 型生物型很可能是在观赏植物贸易中引入意大利的,而 Q 型生物型则是地中海地区的原生生物。