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Volume 2, Issue 1
Displaying 1-12 of 12 articles from this issue
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Suteki SINOHARA1952 Volume 2 Issue 1 Pages 1-6
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1.In the methods of commercial seed productionof cabbage in Japan, there is a method which harvestsseed from premature seed mother plants by meansof summer-sowing culture.By this method, if thesowing too late and the growth is checked, itcauses frequently irregular bolting(Fig.1), so thatseeds may be degenerated. It is serious matter inseed production especially in fall-sowing varieties.This study was performed in order to make clearthe above point.2.The experiments were done at the ShizuokaAgricultural Experiment Station during the period of1948-51, and the tested variety was the Fuji-wasecabbage, a leading variety of fall-sowing early varieties in Japan.View full abstractDownload PDF (1722K) -
Tomoe OINUMA1952 Volume 2 Issue 1 Pages 7-13
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSAn autotetraploid of soybeans as green manure wrasinduced by the colochicine method using one of thehorticltural varletles "Chasengoku".Difference ofcharacters between the diploid the induced tetraploid forms were compared and discussed from thecytological and morphological point of view.In cytologically, 40 chromosomes were observed in the diploid somatic cells, and 80 chromosomes in the tetraploid ones.Most somatic chromosomes were of rod shaped and have median or submedian constictions.One pair of chromosomes has a satellitd and another one pair has a secondary constriction at the end of a little longer arm.Disomatic cells containing twice the normal number of chromosomes were sometimes observed in the diploid form in the cells of pericycle opposite the xylem portion of central cylinder or stele.This phenemenon was scarecely observed in the tetraploid form(Figs.1a, 1b, 2).View full abstractDownload PDF (1338K) -
Yoshio HASHIOKA1952 Volume 2 Issue 1 Pages 14-16
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSBROWN SPOT In order to clarify the general tendencv of the varietal resistance of rice to the brown spot(Cochliobolus"miyabeanus(ITO et KUPIB.)DRECH sL.), 283 varieties native to the diffrent latitudinal regions in Asia were employed for the inoculatiorn tests. The seedling were grown under the meage nutritional condition so as to make them susceptible to the diseage.When the seedling attaind the 3-4 leaf-stage, they were inoculated simultaneously with conidial suspension, then all the varieties were classified into six grades of infection, i.e., highly resistant, resistant, moderately resistant, moderately susceptible, and highly susceptible. So far as the precent experiment was concerned, in general, the variety-groups belonging to the so-called'Japonica'type, i.e.,View full abstractDownload PDF (644K) -
Tsutsumi NAGAMATSU, Akio KITTAKA1952 Volume 2 Issue 1 Pages 17-19
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThree leading varietis, Shinriki, Asahi and Norin No.18 which appeared in 1877, 1908, 1941, succesively, were reared under same cultural conditions at the Experimental Farm of the Kyushu Unversity in 1948.Comparison were made about such characters as culm length, ear lengh, number of ears per plant, total plant weight, total ear weight per plant and 1000 unhulled grain weight from the biometrical view point(table 1 and 2)and discussion was intended to forcuss the direction of imrovement of those characters above mentioned for the rice variety in the warm zone in westsouthen part of Japan.View full abstractDownload PDF (667K) -
Kiyoshi SAITO1952 Volume 2 Issue 1 Pages 20-24
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSFollowmg the prevrous"The utilization of artificially induced polyploid plants in flower breeding"(1950), progenies of twelrty-eight polyploid speciesinduced bv colchicine treatment in 1948-'51 are beingarranged in Tables 1 and 2, showing the relativechange of external characters from original diploidsand the practical value under economic ctilture. Abilities of enlargaing flowers, increasing plant vigor andseed production, hasteningf lowering, strengtheningresistance against cold etc. are now becoming mainsubjects of discussion regard to thei utility. It isshown clearly that most of tetraploids having a fewchromosome numbers for intance, n=5-8 in thehaploid state such as cacalia, verbena, petunia, vincaand snapdragons, have manifested remarkably"Polyploid vigor"of plant growing with enlarged flowersand robust habit. Especially, the tetraploid giant double petunia is the finest flowers in all peturlias wehave ever seen. On the contrary, some tetraploids aslobelia and pansies possessed of a plenty of chromosome numbers in original state are much dwarfenedwith many slender or thickened stems and leaveshaving the same flowes as large as original plants.View full abstractDownload PDF (1209K) -
TOSHIAKI KOYAMA1952 Volume 2 Issue 1 Pages 25-30
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSSince 1943, it has been intended to breed the resistant varieties to rice-blast by hybridization between one of the foreign varieties in Japanese-type which offered resistance to a high degree and some of the Japanese varieties in rice.As the result, it was succeeded to obtained these varieties, "Kanto-No.51", "Kanto-No.52", "Kanto-No.53", "Kanto-No.54"and"Kanto-No.55", all of which have higher resistance to rice-blast compared with any variety of rice in Japan.View full abstractDownload PDF (1557K) -
Goich NAKAJIMA1952 Volume 2 Issue 1 Pages 31-36
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1.In this investigation the number and constitution of chromosome in viable female gametes of(Triticum-Secale triple F1 hybrids, raised from Triticum turgidum(n=14)x Secale cereale(n=7)F1)x Triticum vulgare(n=21), were examined by backcrossing with the pollen of S.cereale.View full abstractDownload PDF (1204K) -
Shuichi NISHIMURA, Hirotaro KATSUMATA1952 Volume 2 Issue 1 Pages 37-41
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSStudies were carried out on the process of flowering.on the crossing technique, and on the set percentagein artificial crossing, for tne research of peanut breeding. The pollens began to flow out at about 9 p.m. and completely flowed out until 2 to 3 a.m. onthe next day. Under natual conditions, 30 to 40%flowers had been pollinated by 3.a.m. and mostpistils were feritilized at about 10 a.m. The pollinized flowers withered in the same afternoon. Crossingoperation was facilitated by using the raised. whichwere about one foot high from the level and borderedby wooden frames. Both parents were arranged systematically on the beds. In this case one operator waspossible to emasculate 36.3 flowers per hour or topollinize 88.8 flowers per hour.View full abstractDownload PDF (984K) -
Hikaru KUWADA1952 Volume 2 Issue 1 Pages 42-46
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSIn the previous report(1950.'51)it was provedthat the germination of seeds of escuJentus, Manihot and Nori-Asa stored dry rstate was very poor, and it was due mainly to the difflculty in absorbingwater owing to the dehydration of the pallisade cellsincluding the light line. In the present report thenature of the cause of such difficulty was studiedView full abstractDownload PDF (934K) -
Seijin NAGAO, Man-emon TAKAHASHI1952 Volume 2 Issue 1 Pages 47-50
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSYAMAUCHI has made a cross beween vareties "Karasu-Mochi" which was blackish violet in glume color and " Shinriki" with colorless or green glume F1 plants had blackish violet glume, somewhat paler than " Karasu-Moch ", and gave in F2 the flowing five phenotypes as to the glume color, namely, 1 ) blackish volet, 2) blackish violet at apiculus, 3) reddsh brown, 4) reddish brown at aicuslus and 5) coloress, in the ratio of 27 : 9 : 9 : 3 : 16 respectively. Based on this result he assumed three genes. B. R, and S concerning the glume colors. According to him, S : a gene responsible for the development of reddish brown pigment at apictilus.View full abstractDownload PDF (743K) -
Hisao ARUGA, Eiichi NAGASHIMA1952 Volume 2 Issue 1 Pages 51-54
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSStudies on the mechanisms of the formation ofsome larval markings making use of several mutantsand their crossed types of the silkworm have beencarried out. We can not understand the formation ofseveral larval markings of the silkworm by thinkingof respective genes only which have been named bygeneticist, but we must think of some another genesand some factors. For the first time, we ought tothink of the differentiation of the cells in the earlvstage of the embryonal development for the complexpatterns of some larval markings, and more over theactions of the genes which control the differentiationof some special anlages of epidermis in addition tothe respective genes. Each genes of marking as formation are classified in two categories:(1)each genesform only respective melanin pigments, (2)eachgenes form melanin pigments and also the specialanlages in the epidermis.View full abstractDownload PDF (1072K) -
Eitaro WADA1952 Volume 2 Issue 1 Pages 55-62
Published: October 20, 1952
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS(1)In 1938, at KONOSU Exp.Station, 134 recommended varieties of low-land rice in Japan weregrown in natural, short day length (8 hours), hightemperature (glass house) and high temp.-short dayconditiorls.By the response of heading time of rice plant under these 4 treatments, examinated varieties weredivided in 2 groups, the former group is high sensitive to temperature and low sensitivity for davlength and the latter group shows high sensitivity forday-length and low sensitivity for temparature. Thefirst group contains almost early varieties and the2nd group are consisted with the later varietiesView full abstractDownload PDF (1363K)
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