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Volume 18 (1942)
- Issue 6 Pages 285-
- Issue 5 Pages 231-
- Issue 4 Pages 157-
- Issue 3 Pages 123-
- Issue 2 Pages 47-
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Volume 18, Issue 6
Displaying 1-6 of 6 articles from this issue
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Yasusi HOSINO1942 Volume 18 Issue 6 Pages 285-296
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESS1. In this report six different subtypes of succinea: succinea-1 (Figs. 2-10), succinea-2 (Figs. 11-16), succinea-3 (Figs. 17-19), succinea-4 (Figs. 20-25), succinea-5 (Figs. 26-31) and succinea-6 (Figs. 32-36) are dealt with. These subtypes can be distinguished from one another by the mode of appearance and disappearance of the individual spots, each subtype having the characteristic mode variation in this respect.
2. Each of these subtypes is due to a factor (p1=factor for succinea-1, p2=factor for succinea-2, p3=factor for succinea-3, etc.) belonging to the same allelomorphic series as conspicua (PC), gutta (PG), distincta (PD), transversifascia (PT), spectabilis (PS), rostrata (PR), axyridis (PA), forficula (PF) and aulica (PAu), and they behave as recessives to all these types.
3. The elytral color pigments are two kinds, black and red, and the presence of the former pigment shows simple dominance to the presence of the latter pigment. Generally, in the elytra of the offspring, only the parts which are red in both parents appear as red.View full abstractDownload PDF (1009K) -
Tositaro MORINAGA, Hideo KURIYAMA, Masaharu AOKI1942 Volume 18 Issue 6 Pages 297-304
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESS(1) Some clonal individuals of a haploid plant of Dekiyama produced, in 1933, several diploid tillers which were normal in every respects (1). In the self pollination progenies traced back to those diploid tillers, certain lines in 1936 segregated, besides the normal plants, very small and sterile individuals nearly in a monohybrid recessive ratio (Table 1). A majority of the normal plants also segregated the dwarf type next year in the same ratio.
(2) At germination, most of the seeds which develop into the dwarf produce hairs very poorly on the epiblast and coleorhiza (Fig. 3). Though the dwarf is discriminated from the normal even in the first foliage stage, the distinction of the two types becomes very clear with the development of the second leaf on account of its short and narrow sheath and short and curved blade.
(3) The upper epidermis of the young dwarf leaf is very characteristic for its far larger number of bulliform cells and the shortness of the ripple wall ones (Figs. 7 and 8).
(4) The dwarf grows more slowly in length than the normal, though it tillers more quickly. The dwarf in maturity is smaller than the normal in every respects of the plant, and the height of the plant is only about 1/4 of that of the normal (Table 3). The development of the flower organs is poor, and no seeds are produced.
(5) Micro- and megasporogenesis is carried through very regularly in the dwarf, but it can not produce any viable pollen-grains or embryo-sacs. Strange to say, a fairly large percent of ovaries contained two ovules (Fig. 16).
(6) We can not tell at present whether this sterile and extremely dwarf mutant is caused by a simple factor mutation or by a loss of a small portion of a chromosome.View full abstractDownload PDF (1589K) -
Yataro TAZIMA1942 Volume 18 Issue 6 Pages 305-308
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSBy application of high temperature shock many mosaics have been obtained in the silkworm egg. As a possible explanation, it was assumed that they are due to binucleated eggs, one of nuclei being a normaly fertilized egg-nucleus and the other being formed by fusion of two spermatozoan-nuclei. There are, however, some cases where this explanation does not apply. One of them, which I am dealing with, is presumably due to a recessive mutation.
This type of mosaic was obtained in a heat-treated egg from a crossing of (PSY/PSY, Re Pe/Re Pe) _??_×(P y/P y, re pe/re pe) _??_. Of 4330 treated eggs, 74 were mosaics and of these only four caterpillars hatched out next spring, the rest all died during hybernation. One of the caterpillars (mp. 43) was heterozygous striped, which is usually expected from F1 offspring. The egg from which this caterpillar hatched out was an intermingled mosaic of black and pink serosa cells, as is shown in Fig. 1. The moth resulted from this caterpillar was female and had a mosaic eye on the left consisting of black and pink facets (Fig. 2). This heterozygous mosaic female was mated to p y/p y, pe/pe male. The segregation between PSY and Py was almost normal as is usually expected for FR1, while Pe-pe ratio was quite abnormal. The segregation of sex chromosomes was also normal in this female and gave normal sex ratio in her offspring. Thus abnormality is evidently limited to the Pe gene. As a possible explanation of this fact several assumptions may be done, but the recessive mutation of Pe to pe in the two cell stage seems to be most probable.
From this mosaic, and others obtained in another way, we learn some important facts as follows;
1. Pe gene does not secrete pe+ substance in the moth of this insect as well as in the egg, as was previously reported by the author. The same conclusion was also confirmed to be applicable to Re gene from another experiment.
2. Mosaic pattern of the compound eye of this insect is very peculiar concerning to the distribution of mosaic tissues, i.e. the striated or band-like arrangement of facets of different colours (Fig. 3). Mosaic tissues do never arrange in a direction parallel to the plane of symmetry in the moth. This fact suggests the direction of development of the compound eyes.View full abstractDownload PDF (656K) -
Eizi MOMMA1942 Volume 18 Issue 6 Pages 309-312
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSIt has been found that the chromosomes of Brachytrupes portentosus, the large brown cricket, vary in the number and form according to individuals. Tateishi ('31) found the following three chromosomal variations in this species; (a) 4V's+10 rods+ X, (b) 5V's+8 rods+X, and (c) 6V's+6 rods+X. While three other types, quite different from those of Tateishi ('31), were reported by Ohmachi ('35) in the same species, such as (a) 6V's+7 rods+X, (b) 19 rods+X and (c) 4V's+10 rods+X. In the three different individuals of the same species recently obtained in Taiwan, the present author observed two different chromosome complexes, one of which consists of 5V's+2J's+7 rods+X (Figs. 1-2; 5-6) and the other contains 5V's+2J's+7 rods +2m-chroms.+X (Figs. 3-4; 7-8).View full abstractDownload PDF (449K) -
Sizuka SASAKI1942 Volume 18 Issue 6 Pages 312-313
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSDownload PDF (190K) -
Kotaro KARASAWA1942 Volume 18 Issue 6 Pages 314-319
Published: 1942
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSDownload PDF (724K)
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