| geographical divergence for quantitative traits in colonising populations of drosophila kikkawai from india. | there are significant geographical variations for four quantitative traits among eight natural populations of drosophila kikkawai along the indian latitudinal transect (8.29 to 33 degrees n). body weight, wing length, thorax length, and ovariole number exhibit significant clinal variation with increase in latitutde. genetic correlations between all the four traits are significantly higher. slope values for body weight and wing length are higher (2.32 per degree latitude) while lower for thorax l ... | 1998 | 9760869 |
| sexual dimorphism for water balance mechanisms in montane populations of drosophila kikkawai. | conservation of water is critical to the ecological success of drosophila species living in the drier montane localities of the western himalayas. we observed clinal variation in desiccation resistance for both sexes of drosophila kikkawai from an altitudinal transect (512-2226 m above sea level). since more than 90 per cent of body water is lost through cuticular transpiration, the target of selection may be cuticular lipids or cuticular melanization. we tested whether melanic females and non-m ... | 2010 | 20106858 |
| characterization of bgtg-1, a tergal gland-secreted alpha-amylase, from the german cockroach, blattella germanica (l.). | the protein fraction of the german cockroach, blattella germanica (l.), tergal gland secretion was examined. sds-page separation of proteins present in b. germanica tergal gland secretion revealed a tergal gland-secreted protein, bgtg-1, at approximately 63 kda. bgtg-1 first appeared in tergal gland secretion at 2 days postimaginal moult and the amount of protein observed increased through day 5. a 2051 bp cdna sequence, bgtg-1, was obtained by race polymerase chain reaction and contains a 1494 ... | 2006 | 16907829 |
| isolation, characterization, and localization of beta-tubulin genomic clones of three drosophila montium subgroup species. | genomic libraries were constructed from three drosophila species, namely drosophila auraria, drosophila serrata, and drosophila kikkawai, belonging to the drosophila montium subgroup of the drosophila melanogaster species group. clones containing beta-tubulin specific sequences were isolated, characterized by restriction endonuclease digestions and southern hybridizations, and mapped by in situ hybridization on the polytene chromosomes of the species studied. the distribution of the beta-tubulin ... | 2002 | 12033631 |
| strong purifying selection on the odysseus gene in two clades of sibling species of the drosophila montium species subgroup. | the odysseus (odsh) gene was duplicated from its ancestral neuron-expressed gene, unc-4, and then evolved very rapidly under strong positive darwinian selection as a speciation gene causing hybrid-male sterility between closely related species of the drosophila simulans clade. has odsh also experienced similar positive selection between drosophila sibling species other than those of the simulans clade? we cloned and sequenced odsh and unc-4 from two clades of the drosophila montium species subgr ... | 2006 | 16612548 |
| segregational load in drosophila kikkawai. i. crossing experiments. | | 1964 | 14191353 |
| segregational load in drosophila kikkawai. ii. experimental populations. | | 1964 | 14191355 |
| segregational load in drosophila kikkawai. 3. natural populations. | | 1964 | 14239768 |
| synchrony of replication in sister salivary glands of drosophila kikkawai. | | 1977 | 611099 |
| replication in drosophila chromosomes: part ii--unusual replicative behaviour of two puff sites in polytene nuclei of drosophila kikkawai. | | 1979 | 468327 |
| accumulation of b-chromosomes in drosophila kikkawai burla. | drosophila kikkawai is a unique species in the genus, having two types of b-chromosomes with distinct centromeres. laboratory experiments pertaining to their accumulation were carried out, using continuous selection and inbreeding procedures. karyotypes with b-chromosomes ranged from 1 to 4. a maximum of four b-chromosomes in a culture were accumulated which seems to be the maximum tolerable limit in this species. | 1994 | 7774291 |
| some evidence of incipient speciation in drosophila kikkawai. | altogether 11 geographic populations of drosophila kikkawai were analysed from the viewpoint of karyotypic variation, inversion polymorphism and sexual isolation. the results revealed that of all the populations, the new guinea population was the most genetically diverged, characterized by its distinct karyotype, possession of a fixed inversion, and its females exhibiting sexual isolation at the level of preferential mating. based on these findings it was inferred that incipient speciation has p ... | 1994 | 7828836 |
| phenotypic plasticity of abdominal pigmentation in drosophila kikkawai: multiple interactions between a major gene, sex, abdomen segment and growth temperature. | drosophila kikkawai is known to be polymorphic for a single autosomal locus controlling abdomen pigmentation in females. two strains homozygous at this locus (abdomen pigmentation, abp) were established from a polymorphic indian population: one was homozygous (dd) for the dark allele, the other (ll) for the light allele. a mendelian analysis of crosses at 25 degrees c confirmed the occurrence of a major locus, with dominance of the d allele. phenotypic variation of pigmentation according to grow ... | 1999 | 10568260 |
| nucleotide variation of seven genes in drosophila kikkawai. | we examined levels and patterns of nucleotide variation in 21 strains of drosophila kikkawai from miyako island, japan for the partial regions of the following seven nuclear genes: adh, ddc, esc, ksr, pgi, su(f), and tpi. the nucleotide variation at total sites (pi(t)) ranged from 0.0013 in the ksr, to 0.0173 in the adh. the nucleotide divergence at total sites (k(t)) between d. kikkawai and d. lini ranged from 0.0286 in the tpi to 0.0687 in the su(f). the levels of nucleotide polymorphism and d ... | 2004 | 15056933 |
| short 5'-flanking regions of the amy gene of drosophila kikkawai affect amylase gene expression and respond to food environments. | evolution of the duplicated genes and regulation in gene expression is of great interest, especially in terms of adaptation. molecular population genetic and evolutionary studies on the duplicated amylase genes of drosophila species have suggested that their 5'-flanking (cis-regulatory) regions play an important role in evolution of these genes. for better understanding of evolution of the duplicated amylase genes and gene expression, we studied functional significance of the amy1 gene of drosop ... | 2008 | 18308485 |
| divergent strategy for adaptation to drought stress in two sibling species of montium species subgroup: drosophila kikkawai and drosophila leontia. | drosophila leontia (warm adapted) has been considered as a sister species of drosophila kikkawai (sub-cosmopolitan) with a very similar morphology. we found divergent strategies for coping with desiccation stress in these two species of montium subgroup. interestingly, in contrast to clinal variation for body melanization in d. kikkawai, cuticular lipid mass showed a positive cline in d. leontia across a latitudinal transect. on the basis of isofemale line analysis, within population trait varia ... | 2012 | 23022537 |
| sex-specific divergence for adaptations to dehydration stress in drosophila kikkawai. | several studies on diverse drosophila species have reported higher desiccation resistance of females, but the physiological basis of such sex-specific differences has received less attention. we tested whether sex-specific differences in cuticular traits (melanic females and non-melanic males) of drosophila kikkawai correspond with divergence in their water balance mechanisms. our results are interesting in several respects. first, positive clinal variation in desiccation resistance was correlat ... | 2013 | 23926311 |
| polytene chromosome arrangements in drosophila bocki. | cytological investigations of salivary gland polytene chromosomes of the drosophila kikkawai complex in thailand have revealed an interesting pattern of species divergence. drosophila bocki, d. leontia and d. kikkawai share chromosome arrangement 3lb. however, additional gene arrangements of 3la and 3lc have been observed in d. kikkawai and d. leontia, respectively, while d. bocki remains polymorphic for inversion 3lb. chromosomal evidence seems to suggest that d. bocki is similar to a common an ... | 1994 | 8080654 |
| evolution of nucleotide substitutions and gene regulation in the amylase multigenes in drosophila kikkawai and its sibling species. | in order to determine evolutionary changes in gene regulation and the nucleotide substitution pattern in a multigene family, the amylase multigenes were characterized in drosophila kikkawai and its sibling species. the nucleotide substitution pattern was investigated. drosophila kikkawai has four amylase genes. the amy1 and amy2 genes are a head-to-head duplication in the middle of the b arm of the second chromosome, while the amy3 and amy4 genes are a tail-to-tail duplication near the centromer ... | 2000 | 10742051 |
| nucleotide variation of the duplicated amylase genes in drosophila kikkawai. | we examined levels and patterns of the nucleotide polymorphism of the amylase genes with a head-to-head duplication in drosophila kikkawai. the levels of variation in d. kikkawai were comparable to those in drosophila melanogaster. tajima's test, fu and li's test, hka test, and mk test did not show significant departure from neutrality. we found an excess of replacement changes in the within-locus class, representing polymorphism in one of the duplicated genes, compared with the between-locus cl ... | 2002 | 11961101 |
| latitudinal clines for morphometrical traits in drosophila kikkawai: a study of natural populations from the indian subcontinent. | natural populations of drosophila kikkawai were collected in india and sri lanka, along a latitudinal transect ranging from 6.8 degrees to 31.8 degrees n latitude. six morphometrical traits were analysed: wing and thorax length, body weight, ovariole number, and abdominal and sternopleural bristle numbers. significant clines were observed for the three-size related traits and for ovariole number, corresponding to a regular increase in the mean value with latitude, but not for bristle numbers. du ... | 1998 | 9674381 |