常用家蚕原种对家蚕微粒子的胚传特性分析

Analysis of the Embryonic Transmission Characteristics of Common Bombyxmori Original Species to Nosemabombycis

家蚕微粒子病是一种危害性极大的传染性疫病,是蚕业生产上唯一的法定检疫对象.不同家蚕原种对家蚕微粒子的胚传特征分析可为家蚕微粒子病的综合防控提供理论支撑.为了充分了解现有主要实用家蚕原种对家蚕微粒子(Nosema bombycis)感染抗性的差异,本研究利用流行病学和统计学方法选择产业中近30年主要分布于四川、重庆、江苏、广西及云南常用的8个高产优质亲本品种(871、872、芙蓉932、湘753、菁松B×A、皓月B×A、苏菊和云7),分别测定其对家蚕微粒子的抗性,并分析了不同品种对家蚕微粒子的胚传规律.经研究发现8个现有生产中常用品种对微粒子抗性明显不同,当母蛾带毒程度>100时,云7的子代感染率与感染强度分别为54.4%和82,均为最低;相对于易感原种871,其子代感染率提高了21.2%,子代感染强度数值提高了34,子代感染率和感染强度的差异均十分明显;同一原种感染程度不同的母蛾胚传存在差异,一般胚传带毒与母蛾带毒呈正相关,表明母蛾带毒程度是影响子代感染率和感染强度变化的主要因素.通过掌握母蛾感染程度与胚传带毒之间的规律,可为原种间抗性差异的研究提供参考,并对家蚕微粒子防控具有重要意义.

Asanextremely destructivesilkworm disease,pébrine(Nosemabombycis)is the only legal quarantine object in the production of sericulture.Analysis of the embryo transfer characteristics of N.bombycis(N.b)from different silkworm(Bombyxmori)original speciesmay provide atheoretical support for the integrated management of this disease.In order to fully understand the differences in the resistance of the existing prevailingparent silkworm varieties to N.b infection,epidemiological and statistical methods were adopted in this study to testthe resistance of eight high-yield and high-quality silkworm parental varieties(871,872,Furong 932,Xiang 753,Jingsong B×A,Haoyue B×A,Su Ju and Yun 7)commonly used in Sichuan,Chongqing,Jiangsu,Guangxi and Yunnan in the past 30 years,andthe embryo transfer of N.b of these silkworm varieties wasanalyzed.The results indicated that the resistance of the eight varieties to N.b was significantly different.When the degree of toxicity of the female moth was>100,the progeny of Yun 7had the lowest infection rate and infection intensity,being 54.4%and 82,respectively.Compared with that ofsusceptiblestock variety 871,the infection rate of the progeny increased by 21.2%,and the progeny infection intensity increased by 34,the differencesbeing significant statistically.A difference was detected in embryo transmission among female moths with different degrees of infection of the same stock,and the general embryo infectionwas positively correlated with that of the female moth,indicating that the infection degree of the female moth was the main factor affecting the changes in the infection rate and infection intensity of the progeny.In conclusion,understanding the relationship between the degree of infection of female moths and embryo infection not onlymay provide reference for the study of resistance differences between the parent silkworm varieties,it also is of significance for the prevention and control of pébrine.