All issues
Volume 73, Issue 867
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yukio DOIDA1960 Volume 73 Issue 867 Pages 337-340
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESSChromosome numbers of some species of Polygonum and related genera have been observed. The results are summarized in Table 1. In three species the basic number 12 has been found. This basic number was not yet reported up to date for Polygonaceae.View full abstractDownload PDF (444K) -
VII: Light-breakAtsushi TAKIMOTO, Katsuhiko IKEDA1960 Volume 73 Issue 867 Pages 341-347
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1) A red interruption was effective for flower inhibition only 8 to 12 hours after the beginning of the dark period irrespective of the duration of the dark period. A 5-minute exposure to far-red (15kiloerg/cm. 2/sec.) given immediately following a 2-minute red irradiation (1500erg/cm.2/sec.) did not remove the inhibitory effect of red at any time during the dark period.
2) A brief far-red irradiation given during the first 12 hours of the dark period inhibited flower initiation. Maximum inhibition was obtained at the 8th hour. Two minutes of red following 5 minutes of far-red reversed the inhibitory effect of far-red completely during the first 4 hours of the dark period, but had little effect at any other time.
3) The inhibitory effect of 1-minute red irradiation given in the middle of a 16-hour dark period was reversed to some extent by the following far-red irradiation, if the duration of the latter was shortened to some 10 seconds. The inhibitory effect of 2-minute far-red irradiation given in the middle of a 16-hour dark period was reversed to some extent by a following 20-second exposure to red.
4) The flower-inhibitory effect of red and far-red given at the 8th hour of a long dark period is stronger when given to the plant with low intensities for long durations than when given with high intensities for short durations.View full abstractDownload PDF (720K) -
(I) Morphological and Histological Observations on the Adventitious Buds on Tomato LeavesKayo FUKUMOTO1960 Volume 73 Issue 867 Pages 348-354
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1. Vigorous adventitious bud formation was observed on the leaf rachises of the tomato plants abundantly fertilized and systematically trimmed.
2. Adventitious buds appear only in the axillary parts of the petiolules of the middle and upper leaves.
3. Under better conditions some of the buds develop into fruit-bearing shoots.
4. Anatomical and histological investigations of the bud formation were made.
5. Growing point of an adventitious bud is initiated in the subepidermal tissue of the leaf rachis as a small group of meristematic cells, which are produced by cell divisions of the subepidermal chlorenchyma.
6. An adventitious bud appears at first as a small protuberance on the leaf rachis.
7. A few leaf primordia and a typical vegetative cone are formed on the protuberance.
8. Somewhat later the basal part of the bud grows longitudinally, and thus an adventitious shoot is formed.
9. By cell divisions in the depth of the parenchyma the procambial strands extend downwards to connect with the conducting tissue of the leaf rachis.
10. At later stages of development, the newly formed vascular system of the bud is seen completely jointed with that of the leaf rachis.View full abstractDownload PDF (1848K) -
1. Major Inorganic Constituents of Some Calcareous Red AlgaeKurazo FURUYA1960 Volume 73 Issue 867 Pages 355-359
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1. With 11 species of calcareous red algae, of which 8 belonging to Corallinaceae and 3 to Chaetangiaceae, the content of Ca, Mg, CO3, SO4 and PO4 was estimated.
2. Calcareous red algae were found to contain a remarkably large quantity of calcium carbonate, its amount being 65 to 70per cent in Corallinaceae and 21 to 60 per cent in Chaetangiaceae.
3. The encrustation of lime was examined with the developing tetraspores of Amphiroa ephedraea and found to start as early as at the first cell division.
4. Magnesium content of coralline algae was found to be generally high compared with that of non-calcareous red algae.
5. An appreciable quantity of sulfate is present in calcareous red algae. Its content in ash is about half as much as found in the acid hydrolysate of the frond, indicating its occurrence in monoester form. The content of ionizable sulfate is exceedingly small, if existing at all.
6. Phosphate content of coralline algae is low and in nearly the same order as of non-calcareous red algae.View full abstractDownload PDF (862K) -
II. Ecological Study on Aquatic Hyphomycetes in the Goshikinuma and Akanuma Lake GroupShizuo SUZUKI, Hiroyoshi NIMURA1960 Volume 73 Issue 867 Pages 360-364
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESSThe distribution of aquatic Hyphomycetes was studied in the lakes of Volcano Bandai, Fukushima Prefecture, Japan.
According to the physico-chemical characters, the lakes are divided into acidotrophic and harmonic types. The lake waters of the former type contain large amounts of mineral acids, while those of the latter contain relatively few acids.
The aquatic Hyphomycetes are more prevalent as well as better in quality in the harmonic lakes than the acidotrophic ones. Tricladium gracile var. oxyphilum is distributed only in the acidotrophic lakes, but never in the harmonic ones. Lemonniera aquatica and Anguillospora longissima seem to adapt to the acidotrophic lakes containing large amounts of mineral acids. On the other hand, Articulospora tetracladia, Lunulospora curvula, Tetrachaetum elegans and Triscelophorus monosporus are distributed only in the harmonic lakes.
The experiments were carried out in the laboratory on the resistance of the aquatic Hyphomycetes against the acidotrophic water. Tricladium gracile, Lemonniera aquatica and Anguillospora longissima have a high resistibility to the acidotrophic water. These results are in accordance with the observations by the writers in natural lakes.View full abstractDownload PDF (579K) -
Masaru AKIYAMA, Hiroyuki HIROSE1960 Volume 73 Issue 867 Pages 365-368
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS -
Jun HANAWA1960 Volume 73 Issue 867 Pages 369-376
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1) Late embryogeny and histogenesis in Sesamum indicum L. were described.
2) The protoderm of the embryo is established early by the periclinal division of the cells of the 8-celled embryo-globe: the cells of the surface layer produced by this division are divided only anticlinally thereafter, except for a few cells participating in the root-cap formation.
3) The tissue differentiation in the embryo starts with the appearance of cells with decreased stainability. The first such cells appear in the outer ground meristem, which makes the embryonic cortex, then follows the appearance of such cells in the inner ground meristem, which makes the pith in the hypocotyl. In consequence of the appearance of these less-staining regions, tissues whose cells are dark-staining and appear unaltered are blocked out as a procambial core and a presumptive region of cotyledons and plumule. The procambial core differentiates into the embryonic stele.
4) The presumptive region of cotyledons and plumule is regarded as an incipient, juvenile shoot apex. The shoot apex develops from the juvenile to the advanced structure through embryogeny. Even in the full-grown embryo, however, the apical meristem remains incompletely developed. No periclinal division occurs in the 2nd or 3rd cell layer at the leaf position prior to the formation of the first foliage leaves. This makes a contrast with the initiation of later leaves, which is preceded by periclinal divisions in the 2nd and 3rd layers. The apical meristem is connected with the procambium of the hypocotyl by two meristematic strands at opposite sides of the procambial cylinder in the intercotyledonary plane before the first leaf primordia are initiated.
5) The apical meristem of the radicle is organized at about the same stage with the cotyledons, earlier than the formation of the plumule. Initials of the root cortex and those of the epidermis and root-cap are distinguished from other cells, from the time of their very origin. The undermost cells of the procambial core, which are contiguous with the cortex initials, function as the initials of the root stele.
6) The embryonic stele is differentiated as a structure having the transitional pattern of vascular system between the cotyledons and the root: its fundamental tissue pattern is already determined when the first protoxylem and protophloem poles appear.View full abstractDownload PDF (1226K) -
Atsushi TAKIMOTO, Yoshio TASHIMA, Shun-ichiro IMAMURA1960 Volume 73 Issue 867 Pages 377
Published: 1960
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESSDownload PDF (118K)
- |<
- <
- 1
- >
- >|