青森県浪岡町における単為生殖型クワヒョウタンゾウムシの染色体研究
4
0
0
全文
(2) Journal of Hokkaido University of Education (Section II B) Vol. 36, No. 2 March, 1976. Amm?±Wg: (^2$KB) IB36« ^2-f BgW61^3fl. A Chromosome Study of a Parthenogenetic Weevil Scepticus insularis Roelofs found in Namioka-machi, Aomori Prefecture, Japan. (Curculionidae : Coleoptera). Yasushi TAKENOUCHI Biological Laboratory, Sapporo College, Hokkaido University of Education, Sapporo 064. ^ f^l ^ : imMNTOW^MS" ^ 7 b 3 ^ > y"^ ^ ^^-fa^W% WSI?:*:'!NLi|Jfc01SA'-N5Ti¥St^. Abstract I have been studied the chromosomes of a Japanese weevil, Scepticus insularis Roelofs, in female materials from Aomori Prefecture, and have found pentaploid parthenogenetic race (5x=55) in Namioka-machi. This species is now known to have three parthenogenetic races,. 3x, 4x and 5x, as well as a diploid bisexual race in Honshu. In Hokkaido, on the other hand, there are four parthenogenetic races, 2x, 3x, 4x and 5x, as well as a diploid bisexual race.. Blakiston's line runs between Hokkaido and Honshu.. Scepticus insularis Roelofs is one of the native Japanese species of curculionid weevil belonging to the subfamily Brachyderinae. The species has five races : pentaploid, tetraploid, triploid and diploid parthenogenetic as well as a diploid bisexual one. The basic chromosome number is 11 (Takenouchi, 1968, 1980, 1983). These data have mainly been obtained from insects obtained in central and southern Hokkaido and Niigata and Yamagata Prefectures in Honshu. No information has been obtained from other localities. However, in order to. establish the detailed distribution of the weevils it is necessary to check the chromosome constitution of insects from the northern part of Honshu and several collections have been. made at different times in several localities in Aomori Prefecture. To make these collections has not been easy but this time I have had a chance to study the chromosomes of the species in Aomori Prefecture.. (D.
(3) ft n. 72. Six females were collected in a bushy area at Namioka-machi, located between Aomori and. Hirosaki, on May 17, 1974. Ovaries with mature eggs of females which had been fixed in modified Allen-Bouin's solution were treated with the routine. paraffin method, and stained with Heidenhain's iron-haematoxylin. Two ovaries observed in two. females showed the oogonial metaphase having 55 well-defined chromosomes of different sizes (Fig. 1).. ^s'. .--^... This number indicates that these specimens are undoubtedly pentaploid reproducing parthenogenetically. There is no evidence for the occurrence of the male in Namioka-machi area. I add a map of. Hokkaido and the northern part of Honshu (JapanHondo) (Fig. 2), from where the cytologically stud- Fig. 1. Oogonial metaphase of S. insularis. ied Scepticus insularis originate and plot onto this. in Namioka-machi, showing 5x=. map the known localities of different degrees of. 55 chromosomes (X 3,600).. polyploidy (including unpublished data). With reference to various races of 5. insnlaris shown on the map, if we take a large view of the situation, they are, in fact, separated by Blakiston's line. Namely, northern Honshu has three parthenogenetic races, 3x, 4x and 5x, as well as a diploid bisexual race, while Hokkaido has four parthenogenetic races, 2x, 3x, 4x and 5x, as well. as a diploid bisexual race. The polyploid animals are evidently larger than the diploid bisexual ones.. References. Takenouchi, Y. 1968. A chromosome study on bisexual and parthenogenetic races of Scepticus insularis Roelofs (Curculionidae : Coleoptera). Jpn. J. Genet. 43 : 377-382. Takenouchi, Y. 1980. Experimental study on the evolution of parthenogenetic weevils (Coleoptera : Curculionidae). J. Hokkaido Univ. Educ. Section H B, 31 : 1-11.. Takenouchi, Y. 1983. On the chromosomes of triploid and tetraploid embryos produced by a tetraploid parthenogenetic Catapionus gracilicornis Roelofs female (Curculionidae : Coleoptera). J. Hokkaido Univ. Educ. Section H B, 33 : 1-5.. (2).
(4) Chromosome Study on a Parthenogenetic Weevils. RiEhlri iBlB^ (5zP)^^^ Q tteaura (?xP)tii. Tjorl (Stfl no)(5xD. f.) (ZnB).. sliifachi (5iP)-. 50 100 150. Fig. 2 Map of Hokkaido and northern Honshu showing collecting localities and distribution of different races of S. insularis.. (3). 73.
(5)
図
関連したドキュメント
Conclusions: The present study demonstrated high HPV prevalence in the anus and urine, and showed a high incidence of anal cytological atypia associated with HR-HPV infections
patient with apraxia of speech -A preliminary case report-, Annual Bulletin, RILP, Univ.. J.: Apraxia of speech in patients with Broca's aphasia ; A
Benkart, Sottile and Stroomer (1996) have studied switching in a general context... The
in [2], [3], Hardy inequalities (and also geometric mean inequalities in some cases) have been studied in the context of X p spaces.. Generalized Orlicz Spaces Pankaj Jain and
Merkurjev's theorem [Me1] implies that even- dimensional forms of trivial signed discriminant and Cliord invariant are exactly the forms whose Witt classes lie in I 3 F , the
Quadratic systems with an invariant algebraic curve have been studied by many authors, for example Schlomiuk and Vulpe [14, 16] have studied quadratic systems with invariant
Although the fractional differential equation boundary-value problems have been studied by several authors, very little is known in the literature on the existence and nonexistence
This approach is not limited to classical solutions of the characteristic system of ordinary differential equations, but can be extended to more general solution concepts in ODE
