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Volume 80, Issue 948-949
Displaying 1-7 of 7 articles from this issue
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Sigenobu KAWAMATU1967 Volume 80 Issue 948-949 Pages 233-240
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSStructure and lamellar formation of the plastids were observed in cotyledons of the seedlings of Pinus densiflora grown in the light or in the dark. In the seedlings grown in the light, chloroplasts have a fully developed lamellar system. Process of lamellar formation is quite similar to that in Angiospermae; the vesicles are lined up together to form lamellae, which develop later into stroma-and grana-lamellae, and finally to highly organized lamellar system.
In the plastids of seedlings grown in the dark, lamellar structure was observed, which was formed through the same process as in the light. It was also noted that in this case after the completion of lamellar formation, stroma-lamellae disappear, remaining only grana structures. The formation of lamellar system under dark condition was interpreted from the fact that in Pinus chlorophyll was formed in the cotyledon even under the same condition.View full abstractDownload PDF (6978K) -
Atsushi TAKIMOTO1967 Volume 80 Issue 948-949 Pages 241-247
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSTwo endogenous rhythms, light-on and light-off rhythms, are associated with the photoperiodic floral response of Pharbitis nil1, 2). The light conditions required to initiate or reset these rhythms were investigated.
Two hours of light at 4000lux was not enough to initiate its own rhythm when applied 8hours after the beginning of the dark period; i. e. the light-off rhythm initiated at the beginning of the preliminary 8-hour dark period still persisted after the 2-hour light period. Light periods of 4 to 8hours were sufficient to initiate a new rhythm even at 10-70lux.
The light-off rhythm was initiated when plants were transferred from 4000lux to 10lux and proceeded normally under 10lux. Transfer of plants from 4000lux to 250lux did not initiate the light-off rhythm, but transfer from 250lux to darkness was effective.
Spectral dependence of light required to initiate the light-off and/or light-on rhythms was very similar to that for light break and the reversion of the far-red effect. Blue, green, red, and white light of 1000, 30, 12, and 30μw/cm2, respectively, were equally effective for induction of the light-off and/or light-on rhythms.View full abstractDownload PDF (760K) -
Ontogeny of the Dwarf Shoot and the Lateral BranchJun HANAWA1967 Volume 80 Issue 948-949 Pages 248-256
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSDevelopment and organization of the dwarf shoot and lateral branch of Pinus Densiflora are described. Dwarf shoots are initiated during the phase of new bud formation extending from July till September, and produce 9 to 12 scales during the first season. The needle leaf primordia were observed to be initiated either during the first season or at the beginning of the second year's growth. All the scales and needles, except the first two scales that are inserted oppositely, are arranged following 2+3 phyllotaxy. After the needles have attained full development, the residual apex of the dwarf shoot shows again some growth activity, producing several cataphylls.
The lastly formed vegetative buds are somewhat larger than buds of the dwarf shoot at the stage of initiation, and they develop to long shoots. During the first season and winter dermancy, a tunica-like stratification of the surface cells appears in the apex of the lateral bud, but it disappears when the bud resumes growth activity in the next spring. After April the lateral bud grows rapidly and acquires size and organization characteristic of an apical meristem of the long shoot by July, and then forms a new bud for the next season's growth.
The dwarf shoot apex displays four cytohistological zones: (1) the zone of apical initials, (2) the zone of subapical initials, (3) the zone of flanking tissue, and (4) the zone of central tissue. Zones of central mother cells and rib meristem which occur in the long shoot apex are lacking in the dwarf shoot apex, and in place of them there are zones of subapical initials and central tissue.View full abstractDownload PDF (2467K) -
Kotaro WATANABE, Katsuyoshi YOSHIKAWA1967 Volume 80 Issue 948-949 Pages 257-260
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSFive species of the Japanese flowering cherries (Prunus jamasakura Sieb., ex Koidz., P. lannesiana Wils. var. speciosa Makino, P. sargentii Rehd., P. subhirtella Miq. var. pendula (Maxim.) Y. Tanaka, and P. yedoensis Matsum.) are self-incompatible. Prunus yedoensis has been propagated only by vegetative reproduction, and the incompatibility was seen in intra- as well as inter-individual pollination: the naturally occurring scanty fruiting may be due to cross-pollination with other species. The remarkable variations in Prunus jamasakura are also partly attributable to the self-incompatibility.View full abstractDownload PDF (404K) -
Yasuji FUJITA1967 Volume 80 Issue 948-949 Pages 261-271
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSClassification and phylogeny of the genus Cinnamomum (Lauraceae) were discussed from view-point of the constituents of essential oils and a cubic system of this genus has been proposed.
A schema is presented to explain the modes of appearance of the elements of formation of essential oils.View full abstractDownload PDF (975K) -
Takeharu BOKURA1967 Volume 80 Issue 948-949 Pages 272-278
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSEffect of various wave lengths of light on growth of leaf in rice seedling was investigated, in 30 varieties of Japanese rice and 6 varieties from foreign countries, under the same intensity of blue, green and red light supplied from colored fluorescent tubes.
While elongation of leaf blades was not altered, that of leaf sheaths was greatly affected by the different wave length of light, and two types of light-growth responsiveness were noticed among rice varieties examined.
The first type is the one that showed greatest elongation under green light and smallest elongation under blue light; the second type is the one that larger elongation was resulted in the order of blue, green and red light.
To the former type belonged all the Japanese varieties, three varieties from the Philippines and one variety from India, and to the latter, two varieties of East Pakistan.View full abstractDownload PDF (633K) -
Kazuo KASAHARA1967 Volume 80 Issue 948-949 Pages 279-287
Published: 1967
Released on J-STAGE: October 31, 2006
JOURNAL FREE ACCESSThe genus Undaria has the structure of the mucilage gland, mentioned as one of the notable characteristics, on lamina.
Dr. Yendo studied very carefully the various aspects in Undaria pinnatifida's gland, particularly as to the process of its growth. He related that the origin is the single cortical cell which is in contact with the epidermal layer and that the epidermal cell upon a glandular cell turns out to be the supragrandular space coating over the gland.
Observations of the gland in the same species obtained in past years from culture vessels and also collected in the fields indicate that the gland in the species, in general, originates in some of the ordinary epidermal cells. Gradually it enlarges and swells, chiefly at the side of the cortex later, accumulating many refractive granules in it. In consequence, the mucilage gland is exposed to the surface; that is, the supraglandular space seems not to exist.View full abstractDownload PDF (1293K)
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