All issues
Volume 26, Issue 4
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
shigeyuki KAWAMURA, Fumio IWASAKI1976 Volume 26 Issue 4 Pages 291-297
Published: December 01, 1976
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe experiment was carried out to study the relationship between pollen germination of several cultivas and agar concentration of the media. In this experiment, pollen of Impatiens balsamina L., Petunia hybrida Hort., Cosmos bipinnatus Cav., Helianthus tuberosus L., Brassica oleracea var. acephala L., Brassica cernua Coss. and Brassica pekin.en.sis Rupr. were used as materials. The agar concentration of the media was plotted 0.5, 1.0, 2.0, 3.0, 4.0, 5.0% and other chemicals were not added in media. The results were as follows : The most suitable concentration of agar media differed: according to pollen of each cultiva. The best germination ratio was observed on 3% agar medium in Impatiens balsamina L., on 2% in Petunia hybrida Hort., on 5% in Cosmos bipinnatus Cav. and on 1% in Brassica oleracea var. acephala L. The germination ratio of Cosmos pollen was better in the high concentration of agar medium than the low concentration of it. So, in the case of the pollen of Cosmos, slide glass was used for pollen germination bed instead of agar medilJ.m. The germination ratio, was better on slide glass than on the agar medium.View full abstractDownload PDF (1289K) -
Hikaru KUWADA, Toshio MABUCHI1976 Volume 26 Issue 4 Pages 298-306
Published: December 01, 1976
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS(1) Crosses were made between Hibiscus asper, H. cannabinus and H. sabdarlffa ill order to obtain interspecific hybridizations through the ovule and embryo cultures. (2) The crossability differed according to the species used and the direction of cross. combination. The pods obtained from H. aspel-XH. cannabinus and H. asperXH. sabda, -zffa contained only immature seeds. In the reciprocal crosses between H. cannabinus and H. sabdarlffa, it was not possible to obtain seeds because of somatoplastic sterility. But the pods of H. sabdal-Iffa XH. cannabinus were set on the female plants for a longer time than those of the reciprocal crosses. When H. cannabinus was pollinated with H. sabdarlffa the ovule of the former were obtained after 4 days by treatment with lanolin containing 100 ppm IAA. The pods of H. sabdarzffa XH. asper were set on the female plants for 9, days or more after pollination, but they gradually fell off. The pods of H. cannabinusX H. asper fell off shortly after pollination. (3) Even though the plants developed a disease, H. sabdal-Iffa could be used as a female plant, and showed a higher percentage of pod setting than did the healthy plants.View full abstractDownload PDF (2033K) -
Torao GOTOH1976 Volume 26 Issue 4 Pages 307-327
Published: December 01, 1976
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSBesides spring and winter wheats, various kinds of intermediate wheat are cultivated in Japan. KAKIZAKI and SUZUKI (1937) classified Japanese wheats into 7 grades according to their heading behavior upon successive sowing in spring. Grade I corresponds to the extreme spring habit of growth, and grade VII to the extreme winter habit. The classification has been found adequate for the explanation of the ecological distribution of wheat in Japan. Although the fundamental idea of the classification lies in an evaluation of the degree of vernalization requirement, some inconsistency may take place between the grades of growth habit estimated by successive sowing and the vernalization requirement on account of day length effect on heading time.View full abstractDownload PDF (1763K) -
Norio HOSOI1976 Volume 26 Issue 4 Pages 328-338
Published: December 01, 1976
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSVarietal responses of heading date, number of main culm leaves and leaf emergence interval have been investigated with 48 paddy rice cultivars differing date of maturity under five different levels of temperature using semi-open air controlling cabinets. Early maturing varieties tend to be more sensitive to temperature in heading and late ones show less sensitivety. But the relative order of heading date among varieties is rather stable and little disturbed by temperature treatments. Varietal responses to temperature in heading are explained in terms of number of main culm leaves and leaf emergence intervals in the following way. 1) When early maturing varieties are grown urLder warm condition, the leaf extension is accelerated and leaf emergcrence intervals are remarkably shortened. Also number of main culm leaves decreases under high temperature. They have large variability in heading: date under different air temperatures. 2) The situation is different in late maturing varieties. When they are grown under warm environment, the leaf emergence intervals are shortened on one hand, but numberof main culm leaves increases on the other hand. On the contrary late maturing varieties, grown under cool enviromrrent are slow in extending leaves but develop smaller number of leaves. In consequence late maturing varietis are less variable in heading date under various temperature conditions.View full abstractDownload PDF (1052K) -
Shigehisa KIYOSAWA, Masae SHIYOMI1976 Volume 26 Issue 4 Pages 339-352
Published: December 01, 1976
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe yearly increase or decrease of disease severity on new varieties with various types of resistance was simulated by using the following equations. Let y=the cumulative number of lesions or scattering spores at time t, y0=y at the initial time of infection, r=infection rate, Y'=the upperlimit of flnal cumulative number of lesions or scattering spores, T=the time at which increase of lesion or spore numbers stops, θ=overwintering rate, k = ( Y'-y0) /y0 Then, [numerical formula]where n is the number of years from the release of the variety and y0, n is the number 0f lesions or scattering spores at the initial time of infection in the n-th year. All parameters required for computation were obtained from the data by KURIBAYASHI and ICHKAWA (1952), and SHlIMOYAMA and his co-workers (unpub1.) on the number of scattering spores measured every year. The effects of true resistance, field resistance and multiline variety were compared by numerical calculation based on the equation and sirnulation by yearly choice of infection rates and overwintering rates from normal random numbers with various means and standard deviations.View full abstractDownload PDF (1210K) -
[in Japanese]1976 Volume 26 Issue 4 Pages 353-362
Published: December 01, 1976
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (1044K)
- |<
- <
- 1
- >
- >|