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Proceedings of the Japan Academy, Ser. B, Physical and Biological Sciences

Vol. 87 No. 7 (2011)

  Vol. 87 No. 7 (2011)
The discoveries of uranium 237 and symmetric fission — From the archival papers of Nishina and Kimura
Proc. Jpn. Acad., Ser. B, Vol. 87, 371-376 (2011) [abstract] [PDF]
Transport of silicon from roots to panicles in plants
Jian Feng MA, Naoki YAMAJI and Namiki MITANI-UENO
Proc. Jpn. Acad., Ser. B, Vol. 87, 377-385 (2011) [abstract] [PDF]
The role of sulfoglucuronosyl glycosphingolipids in the pathogenesis of monoclonal IgM paraproteinemia and peripheral neuropathy
Toshio ARIGA
Proc. Jpn. Acad., Ser. B, Vol. 87, 386-404 (2011) [abstract] [PDF]
Gastric cancer screening by combined assay for serum anti-Helicobacter pylori IgG antibody and serum pepsinogen levels — “ABC method”
Kazumasa MIKI
Proc. Jpn. Acad., Ser. B, Vol. 87, 405-414 (2011) [abstract] [PDF]
Original Articles
Increased numbers of oligodendrocyte lineage cells in the optic nerves of cerebroside sulfotransferase knockout mice
Hitoshi KAJIGAYA, Kenji F. TANAKA, Akiko HAYASHI, Ayaka SUZUKI, Tomoko ISHIBASHI, Kazuhiro IKENAKA and Hiroko BABA
Proc. Jpn. Acad., Ser. B, Vol. 87, 415-424 (2011) [abstract] [PDF]
Combination of two fat saturation pulses improves detectability of glucose signals in carbon-13 MR spectroscopy
Moyoko TOMIYASU, Tsuyoshi MATSUDA, James TROPP, Toshiro INUBUSHI and Toshiharu NAKAI
Proc. Jpn. Acad., Ser. B, Vol. 87, 425-430 (2011) [abstract] [PDF]
Erratum to “Procyanidins are potent inhibitors of LOX-1: a new player in the French Paradox”
Taichi NISHIZUKA, Yoshiko FUJITA, Yuko SATO, Atushi NAKANO, Akemi KAKINO, Shunji OHSHIMA, Tomomasa KANDA, Ryo YOSHIMOTO and Tatsuya SAWAMURA
Proc. Jpn. Acad., Ser. B, Vol. 87, 431 (2011) [abstract] [PDF]
Cover Illustration
Decreased fertility due to low silicon in rice

  Silicon (Si) is the second most abundant element after oxygen in soil, and plants grown in soil will contain some Si in their shoots ranging 0.1~10% of the dry weight. Although Si has not been recognized as an essential element for plant growth, its beneficial effects protecting from various biotic and abiotic stresses such as diseases, pests, nutrient imbalances, and physical stresses caused by typhoon, insufficient sunshine etc, are observed in a wide plant species. Si is especially important for healthy growth and high production of rice, which is able to accumulate Si to over 10% of its dry weight in the shoots. In fact, Si is an agronomically essential element and Si fertilizers are used in several countries including Japan. Cover photo shows the growth of wild-type rice (cv. Nipponbare) and a mutant (lsi1) defective in Si uptake at harvest, indicating the marked effect of high Si accumulation on rice production in the paddy field. Grains are harvested from the wild-type rice (+Si) and mutant (-Si), respectively.
  Recently Dr. Ma and his group have made great progresses in elucidating Si transporter in rice and several other plants. They identified three different Si transporters in rice, maize, barley and pumpkin. By using rice mutants with low Si contents, the influx (Lsi1) and efflux (Lsi2) transporters were identified for the first time. Interestingly, these transporters showed distinct polar localization; Lsi1 at the distal side and Lsi2 at the proximal side of the same exodermis and endodermis cells in the root of rice. Different cellular localization of these Si transporters was observed in the different plant species, which explains the difference in distribution and accumulation of Si depending on the plant species. In addition to these, Lsi6 responsible for unloading of Si from xylem to the leaf blade was also identified in rice. These findings contribute to the better understanding of plant mineral uptake system, and the genes they identified may be useful for manipulating crops with increased Si uptake to improve tolerance to environmental stresses in future.

Teruhiko Beppu
Member of the Japan Academy

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