In the present paper the author proposed a new subgenus of Lophozia Dum., Hattoriella, including a single species, L. diversiloba Hatt., and the relationships to other subgenera are discussed. Key to those subgenera may be as follows: Underleaves present; cortical cells of stem with distinctly thickened walls; oil-bodies rather few in number and large in size; capsule wall composed of 3-5 layers; gemmae present; paraphyllia usually not present in male inflorescence …Orthocaulis and Leiocolea Underleaves not present; cortical cells of stem not so thickened; oil bodies few in number and large in size; capsule wall composed of 2 layers of anisodiametric cells; gemmae not present; paraphyllia present in male inflorescence …Hattoriella Underleaves not present; cortical cells of stem not thickened; oil-bodies many in number and small in size; capsule wall composed of 3-5 or 2 (in Isopaches, isodiametric cells) layers; gemmae present; paraphyllia not present in male inflorescence……Dilophozia, Isopaches and Massula.
This study was made to demonstrate the relationship between certain growth inhibitors and Salkowski's color reaction inhibitors, and to identify these substances. 1) In ethanolic extract of Helianthus leaves, there are three substances which inhibit the IAA induced growth of Avena coleoptile sections. 2) Two of them also inhibit Salkowski's color reaction of IAA. 3) These two substances were identified with chlorogenic and isochlorogenic acid, respectively. 4) Chlorogenic acid inhibits, at 10-4-10-3M, the IAA induced growth of Avena coleoptile and, in concentration of 10-4M, promotes the elongation in absence of IAA. 5) These effects of chlorogenic acid on growth seem to depend on the change of pH of the test solution due to the addition of different concentration of the acid. But the facts that caffeic acid has an inhibitory effect on growth and the probable occurrence of chlorogenic acid in dormant bud, let the authors have an idea that chlorogenic acid has some role on growth of plant. 6) Chlorogenic acid decreases Salkowski's color development. 7) The growth curve of Avena coleoptile sections in solutions containing various concentration of chlorogenic acid and the Rf value of chlorogenic acid resemble those of the accelerator-α of Bennet-Clark and Kefford.
1) The spring wheat, Konosu No. 25, was cultured on media containing White's mineral nutrients and sucrose of various concentrations under three photoperiodic conditions: continuous illumination, short days and total darkness. 2) The effects of sucrose concentrations on the growth and development of the wheat plant were investsgated. For the normal development of the plants, more than 4per cent sucrose must be added in, darkness, 2per cent in short days and no sucrose in long days. On dry matter production, effects of sucrose were appreciable under all light conditions. 3) In darkness the wheat plants could sustain their growth at least for 135 days and initiate flowers on the media containing more than 4per cent sucrose. 4) The number of leaves formed on the axes before flower initiation was 5 in long days, 7 in short days and 10 in darkness.
The effect of the ether extract of immature bean seeds on the growth of rice seedlings was studied. Attempts were made to separate active principles by paper chromatography. The growth of the intact coleoptile was promoted by the eluate from the zone of Rf 0.9 in the solvent mixture of isopropyl alcohol/water/ammonia (10:1:1). EIA and IAN showed similar Rf to that of the coleoptile growth-promoting substance of the bean extract. Synthetic EIA was found to be 10 times more effective than IAA on the pormotion of rice coleoptile growth. On the other hand the growth of the intact foliage leaf was promoted only by the eluate from the zone of Rf 0.65 and inhibited by that of Rf 0.75. Gibberellin A showed similar Rf to that of the leaf growth-promoting substance of the bean extract.
Elongation of the hypocotyl, epicotyl and radicle depends upon the amount of excised cotyledon; the greater it is excised, the more elongation is suppressed; in the case of the same amount of excision it comes out more prominently when equal amount is excised from the both sides of cotyledon than in that excised only from one side. Elongation is also more suppressed according an earlier excision. Formation of lateral roots is as well more inhibited in the case of a greater amount and an earlier time of excision. By entire excision on the 1st day the differentiation of palisade and spongy parenchumata of the 1st leaves does not occur, but by the same excision after the 2nd day it takes place. Development of the shoot apex is likewise suppressed by cotyledon excision. Most of the 2nd leaves show a tendency to develop on the site above right side cotyledon; and by entire excision of either right or left cotyledon the phyllotactic position of them can be altered. By removal of the epicotyl an axillary bud sprouts from the axil of each cotyledon. The stronger the cotyledonary activities were at the time of epicotyl removal, the more those axillary prophylls exhibit a scale nature like stipule; then it seems there may be some factors in the cotyledon which could suppress the development to foliage leaf of such prophylls.
A study was made on the nuclear conjugation in diploidisation by the doubly compatible diploid mycelium, using Coprinus macrorhizus f. microsporus (a tetrapolar fungus). A small diploid mycelium was inoculated at the periphery of a large haploid mycelium. One of the nuclei of the diplont derived from the same fruit-body with the haplont and the other from a different fruit-body. Both nuclei of the diplont were compatible with the nucleus of the haplont. Nuclear constitution of the diploid mycelium resulting from the doubly legitimate combination was analyzed. The result showed that, in many combinations, the nucleus of the large haploid mycelium conjugated with that from the different fruit- body, but, in some combinations, with the nucleus from the same fruit-body. The above result may be well explained on the assumption of modifiers which control the affinity of conjugation between two compatible nuclei.