The Drosophila bipectinata species complex: degree of sterility and dystrophied ovaries in interspecific hybrid females

Banerjee, Parul; Singh, B. N.

doi:10.1007/s12041-015-0600-3

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Therefore, we planned to investigate this further and check the fertility of hybrid daughters from all the crosses. We found that daughters having D. pseudoananassae as one of their parents had drastically reduced fertility compared to the parental females (Banerjee and Singh 2015b). In the crosses D. pseudoananassae females 9 D. bipectinata males and D. pseudoananassae females 9 D. parabipectinata males, the hybrid sons were found to have severely compromised eye symmetry and poor viability.…”

Section: Discussionmentioning

confidence: 77%

Interspecific hybridization does not affect the level of fluctuating asymmetry (FA) in the Drosophila bipectinata species complex

Banerjee

Singh

2015

Genetica

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The Drosophila bipectinata species complex comprises of four very closely related species namely D. bipectinata, D. parabipectinata, D. malerkotliana and D. pseudoananassae. It was found that irrespective of the evolutionary divergence among the species, FA which is reflective of the developmental precision remains nearly same in four species. During the present study, the level of FA in different morphological traits was studied in interspecific hybrids and compared with that of parental species with the view that it would throw light on the degree of divergence between the parental species. If they have not diverged much, the interspecific hybrids may have a similar FA level, incompatibilities between their genomes being negligible. On the other hand, if there is substantial divergence, the level of FA may be higher due to incompatibility between the genomes of the parental species. The morphological traits taken were sternopleural bristle number and wing length in both males and females and ovariole number and sex-comb tooth number in females and males respectively. However, except in a few cases, we could not detect any significant differences in the level of FA in hybrids as compared to pure species. On the other hand, a number of abnormalities like poor viability, dystrophied ovaries, asymmetrical eyes etc., could be detected in hybrids from crosses involving D. pseudoananassae as one of the parents. Therefore, we conclude that specific developmental pathways are more susceptible to developmental disturbances due to genomic incompatibilities than the large complex system bringing about developmental stability.

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Section: Discussionmentioning

confidence: 77%

Interspecific hybridization does not affect the level of fluctuating asymmetry (FA) in the Drosophila bipectinata species complex

Banerjee

Singh

2015

Genetica

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“…For the fertility assay, we checked the larval activity. This procedure was earlier used by Kim and Watanabe (1989) and Banerjee and Singh (2016). All the experiments of fertility assay were categorised into two groups that was group I and group II.…”

Section: Fertility Assaymentioning

confidence: 99%

Evidence for Initiation of Post-Zygotic Reproductive Isolation between Drosophila ananassae and D. pallidosa as Indicated by Reduction in the Fertility of Hybrid Males

Singh¹,

Singh²

2020

IJB

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There are several barriers to preclude the gene flow between diverging populations. On the basis of their temporal nature, these can be broadly categorized into two forms: pre- and post-zygotic. Post-zygotic reproductive isolation can manifest in the form of reductions in hybrid fertility. Keeping this fact in view, in the present study, we studied sterility in hybrids of D. ananassae and D. pallidosa. Surprisingly a distinguishable pattern of infertility was found in the hybrids. This pattern, referred to as Haldane’s rule, is often observed in hybrids of recently diverged populations or species. Reduction in the fertility of hybrids provides the clue of incipient kind of post-zygotic reproductive isolation in these two sibling species. This is the first report of hybrid sterility in this species pair. However, hybrid sterility is not very prominent especially when compared to that of other species pairs with the similar divergence time. Thus, on the basis of our results, we conclude that either sexual isolation between these sibling species is sufficient and does not require the aid of post-zygotic isolation to preclude gene flow or rate of divergence between D. ananassae and D. pallidosa is very slow in comparison to other species pair or even races of some species.

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The Drosophila bipectinata species complex: phylogenetic relationship among different members based on chromosomal variations

Banerjee

Singh

2017

J Genet

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Making interspecific hybridizations, where possible remains an unparalleled option for studying the intricacies of speciation. In the Drosophila bipectinata species complex comprising of four species, namely D. bipectinata, D. parabipectinata, D. malerkotliana and D. pseudoananassae, interspecific hybrids can be obtained in the laboratory, thus bequeathing an ideal opportunity for studying speciation and phylogeny. With the view of investigating the degree of divergence between each species pair, we planned to study the polytene chromosomes of the F hybrids, as it would mirror the level of compatibility between the genomes of the parental species. Two sets of crosses were made, one involving homozygous strains of all four species from India and the other including homozygous strains from different places across the globe. Polytene chromosomes of F larvae from both sets of crosses had similar configurations. In F larvae from crosses involving D. bipectinata, D. parabipectinata and D. malerkotliana, complex configurations (depicting overlapping inversions) could be detected in different arms. However, they were fairly synapsed, indicating that the differences are only at the level of gene arrangements. The polytene chromosomes of larvae obtained by crossing D. pseudoananassae with the other three species were very thin with gross asynapsis in all the arms, demonstrating that the genome of D. pseudoananassae is widely diverged from rest of the species. The overlapping inversions (reflected in complex configuration), are inferred in the light of earlier chromosomal studies performed in this complex.

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The Drosophila bipectinata species complex: degree of sterility and dystrophied ovaries in interspecific hybrid females

Abstract: Banerjee P. and Singh B. N. 2016 The Drosophila bipectinata species complex: degree of sterility and dystrophied ovaries in interspecific hybrid females. J. Genet. 95, [167][168][169][170]

Cited by 4 publications

References 22 publications

Interspecific hybridization does not affect the level of fluctuating asymmetry (FA) in the Drosophila bipectinata species complex

Interspecific hybridization does not affect the level of fluctuating asymmetry (FA) in the Drosophila bipectinata species complex

Evidence for Initiation of Post-Zygotic Reproductive Isolation between Drosophila ananassae and D. pallidosa as Indicated by Reduction in the Fertility of Hybrid Males

The Drosophila bipectinata species complex: phylogenetic relationship among different members based on chromosomal variations

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