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FOREWORD Forty years have passed since full-scale mutation breeding research began with the founding of the Institute of Radiation Breeding (IRB). During this time, many mutation varieties bred in Japan have been accepted as familiar agricultural products. Mutation breeding is expected to play an increasingly important role in Japan for improving plants. In this sense, this symposium provides a vital opportunity for exchanging research information and engaging in much-needed discussion. Dramatic progress has been made during the last decade in the study of biosynthesis, perception, and signal transduction of plant hormones. Due to the importance of recent basic molecular knowledge of plant hormones to future research in mutation breeding, we have selected the theme “Plant hormone research and mutation” for the 42nd Gamma Field Symposium. We have invited eight lectures on this subject, including a special lecture entitled, “Biosyntheses and regulation of plant hormones” on the physiological action of plant hormones to be given by Dr. Yuji Kamiya of the Institute of Physical and Chemical Research (RIKEN). The IRB has economically evaluated mutation breeding in agricultural production and prepared pamphlets to introduce mutation varieties released in Japan. As of March 2003, 320 mutant varieties have served in developing 50 kinds of crops. The cumulative cultivation of mutation varieties has occupied 5.5 million hectares, corresponding to 1.1-fold of the total area under cultivation per year in Japan. The cumulative production value of such agricultural products reached 7 trillion yen, which corresponds to total annual domestic agricultural production. Mutagens (agents of mutation induction) used for these 320 mutant varieties included gammarays at 72%, tissue culture at 11%, chemical substances at 10%, and X-rays and others at 7%. Among mutation varieties, 145 were used as is, obtained directly from mutagen processing. Of these 74 varieties used IRB facilities, accounting for 51%. The number of indirectly used varieties obtained by hybridizing mutants or the progeny of mutants was 175, demonstrating how the use of mutated genes had advanced. In closing, we thank the lecturers who have so kindly taken time out from busy schedules to prepare for this symposium and to all who have provided their unstinting support in making this symposium a success.
The Symposium Committee Shigeki NAGATOMI, Chairperson Yuji ITO Toshikazu MORISHITA Yasuo NAGATO Minoru NISHIMURA Seibi OKA Tetsuro SANADA Yoshio SANO Takatoshi TANISAKA Nobuhiro TSUTSUMI
Page 1 and 2: ISSN 0435-1096 Gamma Field Symposia
Page 3 and 4: The lecturers and the members of th
Page 5 and 6: KANEKO, T. KARITA, E. KASHIMA, M. K
Page 7: TANO, S. TSUCHIDA, Y. TSUTSUMI, N.
Page 11 and 12: CONTENTS Y. KAMIYA Biosyntheses and
Page 13 and 14: 2 Yuji KAMIYA Fig. 1. Gibberellin b
Page 15 and 16: 4 Yuji KAMIYA using the receptor pr
Page 17 and 18: 6 Yuji KAMIYA Fig. 3. Origin of sid
Page 19 and 20: 8 Yuji KAMIYA References AKIYOSHI,
Page 21 and 22: 10 Yuji KAMIYA SHINOMURA, T. (1997)
Page 23 and 24: 12 Yuji KAMIYA 8’ 8’ 273
Page 25 and 26: 14 Motoyuki ASHIKARI, Hironori ITOH
Page 37 and 38: 26 Atsuhiro OKA and how their signa
Page 39 and 40: 28 Atsuhiro OKA At almost the same
Page 41 and 42: 30 Atsuhiro OKA division for xylem
Page 43 and 44: 32 Atsuhiro OKA the RR domain in th
Page 45 and 46: 34 Atsuhiro OKA Fig. 4. Cross-talk
Page 47 and 48: 36 Atsuhiro OKA OKA, A., SAKAI, H.
Page 49 and 50: 38 Atsuhiro OKA ARR4 PHYB PHYBP
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ETHYLENE-SIGNALING PATHWAY 49 In sp
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ETHYLENE-SIGNALING PATHWAY 51
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Gamma Field Symposia, No. 42, 2003
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MECHANISM OF BRASSINOSTEROID SIGNAL
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