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首页> 外文期刊>Chinese science bulletin >Testes and chromosomes in interspecific hybrids between Helicoverpa armigera (Hubner) and Helicoverpa assulta (Guenee)
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Testes and chromosomes in interspecific hybrids between Helicoverpa armigera (Hubner) and Helicoverpa assulta (Guenee)

机译：棉铃虫（Hubner）和棉铃虫（Guenee）种间杂种的睾丸和染色体

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The interspecific hybridization between Helicoverpa armigera females and Helicoverpa assulta males yielded F_1 hybrids (RS), fertile males and sterile individuals with abnormal genitals. The reverse hybridization between H. assulta females and H. armigera males yielded F_1 hybrids (SR)- fertile males and fertile females. The morphology of testes and the karyotype of chromosomes of larvae in the hybrids were investigated. Among the 2d old fifth-instar SR larvae, individuals without testes were fertile females and those with testes were fertile males. The length and breadth of testes between SR and parental species were not significantly different (p>0.05). Among the 2d old fifth-instar RS larvae, the testes were observed in all the individuals, but it could be classified into two types. The length and the breadth of testes in Type 1 larvae were not significantly different from those of their parental species (p>0.05), while those in Type 2 were significantly less than those of their parental species (p<0.01). Mitotic metaphase I of brain cells showed the diploid chromosomes number of both reciprocal hybrids was 2n=62, as many as their parents. The haploid number of 31 was confirmed by counts from spermatocytes at meiotic metaphase from SR male larvae and Type 1 larvae of RS. Meiosis was not observed in spermatocytes of Type 2 larvae of RS. Considering the characteristics of adult hybrids of RS, it was concluded that Type 1 individuals in RS were fertile and those of Type 2 were sterile. The sterility of Type 2 individuals in RS is attributed to the abnormity in development of testes and the failing meiosis of spermatocytes. As a result, the normal spermatozoon could not been produced.
机译：棉铃虫女性与棉铃虫男性之间的种间杂交产生了F_1杂种（RS），可育男性和生殖器官异常的不育个体。攻击链霉菌雌性和棉铃虫雄性之间的反向杂交产生F_1杂种（SR）-可育雄性和可育雌性。研究了杂种中幼虫的睾丸形态和染色体核型。在2岁的五龄SR幼虫中，没有睾丸的个体是可育的雌性，而有睾丸的个体是可育的雄性。 SR与亲本物种之间的睾丸长度和宽度没有显着差异（p> 0.05）。在2岁的5龄RS幼虫中，在所有个体中均观察到睾丸，但可以将其分为两种类型。 1型幼虫的睾丸长度和宽度与其亲本种类没有显着差异（p> 0.05），而2型幼虫的睾丸长度和宽度则明显小于其亲本种类（p <0.01）。脑细胞的有丝分裂中期I显示，两个倒数杂种的二倍体染色体数为2n = 62，与它们的亲本一样多。单倍体数31由SR雄性幼虫和RS 1型幼虫减数分裂中期的精母细胞计数确定。在RS的2型幼虫的精母细胞中未观察到减数分裂。考虑到RS的成年杂种的特征，可以得出结论，RS中的1型个体是可育的，而2型的个体是不育的。 RS中2型个体的不育归因于睾丸发育异常和精母细胞减数分裂的失败。结果，不能产生正常的精子。

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