著者

松本 宏

出版者

植物化学調節学会

雑誌

植物の生長調節 (ISSN:13465406)

巻号頁・発行日

vol.49, no.2, pp.149-152, 2014-12-20

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The radioactive cesium released by a nuclear plant accident was dissolved in rainwater and deposited on the land surface. The nuclide was adsorbed strongly by clay fraction as soon as it contacted with the soil and remained in the soil outer layer. Plants absorb various kinds of substances with water from their root, but the cesium in the clay is hardly absorbed.On the other hand, the nuclide moves more easily in sandy soil, peat soil and organic matter layers that accumulated on the forest floor. When cesium is deposited on organic matter, it can be absorbed by plants. The translocation pattern in plants is similar with that of potassium ; transferring and accumulating in the growing part. In the river water, the radioactivity is detected when the soil sediment is contained. It is important to take means not to move a surface soil from the contaminated sites. In forest environments, cesium moves in the ecosystem. The survey of the nuclide deposition at one and a half years after the accident revealed that the radioactivity in the coniferous leaf or bark is approximately reduced to half and that in the soil outer layer increased by degradation of organic matters followed by downward movement by precipitation. The nuclide adsorbed by the soil is hard to move outside the system without artificial disturbance. However, the outflow of the soil by the muddy water is concerned in a steep slope. The preventive measures with an artificial pond, a ditch or the wall will restrain re-pollution.

著者

札埜 高志

出版者

植物化学調節学会

雑誌

植物の生長調節 (ISSN:13465406)

巻号頁・発行日

vol.47, no.2, pp.114-119, 2012-12-20

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Inflorescence characterized by clusters of florets, rather than simple flowers, is often used as cut flowers. The number of florets and the shape of inflorescence have a significant impact on the quality and price of cut flowers, and therefore, controlling these characters is crucial in cut flower production. The mechanism of inflorescence architecture development appears to intricately change depending on the hereditary factors and cultivation conditions, but it has some regularity, too. In this paper, it is explained that the mechanism of inflorescence architecture development for the purpose of stable production of cut flowers, especially of Gypsophila paniculata using a term of "regularity" as a keyword.

著者

高橋 洋平 井上 晋一郎 島崎 研一郎

出版者

植物化学調節学会

雑誌

植物の生長調節 (ISSN:13465406)

巻号頁・発行日

vol.43, no.2, pp.135-143, 2008-12-19

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気孔は一対の孔辺細胞から構成され,光によって開口し植物ホルモン(アブシシン酸,ジャスモン酸など)によって閉鎖し,植物と大気間のガス交換を調節している.孔辺細胞はシグナルとして作用する青色光をフォトトロピンを介して受容し,化学情報への変換,細胞膜H^+-ATPaseの活性化,内向き整流性K^+チャネルによるK^+の取り込み等の過程を経て気孔開口を引き起こす.一方,孔辺細胞はアブシシン酸や二酸化炭素を受容し,多くの情報伝達体からなるネットワークを通して,細胞膜陰イオンチャネルを介したイオンの遊離によって気孔閉鎖を誘発する.気孔の開口および閉鎖に関与する情報伝達因子,それらを制御する蛋白質リン酸化反応,さらに,独立した経路と考えられた気孔開口と閉鎖の両経路間のクロストークの解明が進んでいる.