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Volume 31, Issue 6
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Ken NOZAWA1956 Volume 31 Issue 6 Pages 163-171
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1) Two environmental effects on the expressivity of Curly character were found and studied with Cy/l (2) 50c flies as material.
2) One of these effects was larval population density. It influenced Curly expressivity through the nutritional conditions of the larvae; the good nutritional conditions of the larval stage were observed to give typical Curly expression.
3) Another was cultural temperature; higher temperature gave higher expressivity of Curly character. The temperature-effective period was determined to be in the last one day of the pupal stage.
4) Within the range of these experiments the effect of temperature in the pupal stage was appeared to be more dominating than that of larval population density to determine Curly expressivity.View full abstractDownload PDF (820K) -
IV. POLYGENIC DIFFERENCES IN AGRONOMIC CHARACTERS BETWEEN LOCAL STRAINS OF A BARLEY VARIETY, “HAKATA NO. 2”Kanji GOTOH1956 Volume 31 Issue 6 Pages 172-175
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS5 seed samples of 2-rowed beer barley “Hakata No. 2” were obtained from widely separated locations, ranging from Hokkaido to Kyûshû, and compared with each other in a randomized block arrangement with 5 replications during two years.
The differences found among them were of statistical nature, and upon visual inspection, they were undiscernible. Differences between local stratins in grain yield, number of ears per plant and date of heading were non-significant, whereas those in culm length, ear length, number of spikelets and weight of 1000 grains were significant.
It is assumed that these differences may be governed by polygenes. As seen from Table 2 and 4, a clinal variation was found in ear length and number of spikelets. These variations were explained as being the result of polygenic segregations under the pressure of natural selection according to the local conditions.View full abstractDownload PDF (373K) -
Masanaka TERADA, Isamu KONDO, Tomokazu OGAWA1956 Volume 31 Issue 6 Pages 176-183
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSWe have taken up the study of phage genetics, chiefly in connection with the problem whether the recombination phenomenon already demonstrated in the phages of T series can also be observed in other bacterial viruses.
We succeeded in finding evidence of genetic recombination for some pairs of characters in phages from S. gallinarum (Akita strain) and S. sendai (S. 71 strain).
The genetic characters chosen in this crossing experiments were plaque morphology, host-range and a peculiar lytic action of some viral strains against a phage resistant bacterium.
The recombination interpretation was confirmed by the results by crossing the respective recombinants.
It is also believed that among the genetic facts found in the crossing experiments, there are some specific data which are different from those reported for the phage of the T series. The authors believe that the analysis of these discrepancies will further widen our knowledge of phage genetics.View full abstractDownload PDF (1032K) -
Isao FUJIWARA1956 Volume 31 Issue 6 Pages 184-191
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1) The karyotypes of six species were studied and the results are formulated as follows;
Plantago camtschatica Chamisso
K(2n)=12=2csA1m+2A2sm+2csBm+2C1sm+2C2sm+2tDt
P. coronopus L.
K(2n)=10=2tcscsAsm+2Bsm+2CtCst+2Dsm+2Em
P. lanceolata L.
K(2n)=12=2csAsm+2Bsm+2Csm+2Dm+2Est+2Fst
P. virginica L.
K(2n)=24=2A1sm+2A2m+2Bsm+4Csm+2Dsm+4Em+4Fm+4Gsm
P. psyllium L.
K(2n)=12=2csA1m+2csA2sm+2Bsm+2tC1sm+2tC2sm+2tDm
P. indica L.
K(2n)=12=2csA1m+2csA2sm+2B1sm+2(cs)B2st+2Cst+2(cs)Dst
2) The karyotypes of subgenus psyllium are essentially similar to those of subgenus Euplantago.
3) In Plantago, many species are found to have the basic number x=6 and only a few with x=5 or x=4. Having a pair of conspicuously large, metacentric (White 1945) chromosomes, the karyotype of P. coronopus, x=5., is characteristic and clearly distinguished from those of the species with x=6.
4) P. indica is partially related to P. psyllium, karyotypically. P. psyllium has a symmetrical karyotype and is regarded as a primitive species. P. indica, having an asymmetrical karyotype, is a differenciated species.
5) Karyotypically, P. virginica is an allotetraploid.View full abstractDownload PDF (1278K) -
IX. Further note on the karyotypes of Delphinium and its allied generaMasahide KURITA1956 Volume 31 Issue 6 Pages 192-195
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. Karyotype study was carried out on eight species in three allied genera. Their karyotypes can be represented as follows:
Delphinium flexuosum K(2n)=32=4Am+4Bst+20Cst+4Dst
D. decorum K(2n)=32=2A1m+2tA2m+4Bst+2tC1st+18C2st+4Dst
Lycoctonum siroumense K(2n)=16=A1m+tA2m+2Bst+2Cst+8Dst+2tEst
Aconitum Kishidai K(2n)=16=2tAm+2Bst+2tCst+8Dst+2Est
A. metajaponicum K(2n)=16=2Am+2Bst+2Cst+2D1st+6D2st+2Est
A. paludicola K(2n)=32=4Am+4Bst+4Cst+4tD1st+12D2st+4Est
A. curvipilum K(2n)=32=4Am+4Bst+4Cst+2D1st+14D2st+4Est
A. septemcarpum K(2n)=32=tA1m+tA2m+2A3m+4Bst+4Cst+2tD1st+14D2st+4Est
2. When the satellite is left out of consideration, Delphinium flexuosum and D. decorum have a similar basikaryotype which is found to be intermediate between the basikaryotypes of D. Ajacis and Lycoctonum-or Aconitum-species.
3. Lycoctonum siroumense and Aconitum septemcarpum seem to be hybrids, judging from the asymmetry of satelliteView full abstractDownload PDF (432K)
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