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54 Takeshi NAKANO, Shigeo YOSHIDA and Tadao ASAMI Fig. 1 Brassinosteroid biosynthesis pathway. Arabidopsis mutants such as det2, dwf4 and cpd clarified the detail brassinosteroid biosynthetic pathway. One possible target of Brz is the cytochrome P450 enzyme encoded by DWF4. phytohormone group. Brz, Brassinosteroid biosynthesis inhibitor, revealed brassinosteroid functions in plant growth The recently-synthesized compound brassinazole (Brz or Brz220) was the first specific inhibitor of brassinosteroid biosynthesis to be discovered. One possible target of Brz220 is the cytochrome P450 enzyme encoded by DWF4 (Asami et al., 2001) (Fig. 1). Brz220 treatment of
MECHANISM OF BRASSINOSTEROID SIGNALING 55 plants under dark conditions causes phenotypes similar to those displayed by brassinosteroiddeficient mutants, such as shortened hypocotyl, cotyledon opening, and de-etiolation. In the light, plants treated with the Brz displayed dwarf and highly greened leaves (Asami et al., 2000, Asami and Yoshida, 1999). In the stem tissues, development of the vascular bundle cells was inhibited by Brz. (Nagata et al., 2001) The Brz also revealed the regulation of chloroplast development by brassinosteroid. In the cotyledon of dark-germinated plant, the mRNA of chloroplast genes; i.e., cab and rbcS, did not expressed. But, in the cotyledon of dark-germinated plant with Brz, these chloroplast genes expression was detected (Asami et al., 2000, Nagata et al., 2000). After 2 hour light emission to these dark-germinated plant, the Brz-treated plant harbored very quick developed chloroplast that contained more numbered thylakoid membrane layer that Brz-untreated plant. These result revealed that plastid development was regulated brassinosteroid. (Fig. 2) Brassinosteroid receper BRI1 The Arabidopsis bri1 mutant was also identified by its dwarf phenotype, but brassinosteroid treatment did not recover the dwarfism to wild-type phenotype and did not inhibit the elongation of the roots of this mutant (Clouse et al., 1996, Li and Chory, 1997) (Fig. 3). Study of bri1 revealed that BRI1 is a critical component in brassinosteroid signaling, and that mutation in its BRI1 gene Fig. 2 Brz effect to the plant. Brz treatment of plants under dark conditions causes photomorphogenesis such as shortened hypocotyl, cotyledon opening. In the light, plants treated with the Brz displayed dwarf and highly greened leaves. The Brz also revealed the regulation of chloroplast development by brassinosteroid.
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ISSN 0435-1096 Gamma Field Symposia
Page 3 and 4:
The lecturers and the members of th
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KANEKO, T. KARITA, E. KASHIMA, M. K
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TANO, S. TSUCHIDA, Y. TSUTSUMI, N.
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The Symposium Committee Shigeki NAG
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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
Page 51 and 52: Gamma Field Symposia, No. 42, 2003
Page 53 and 54: ETHYLENE-SIGNALING PATHWAY 43 signa
Page 55 and 56: ETHYLENE-SIGNALING PATHWAY 45 The f
Page 57 and 58: ETHYLENE-SIGNALING PATHWAY 47 Snf3p
Page 59 and 60: ETHYLENE-SIGNALING PATHWAY 49 In sp
Page 61 and 62: ETHYLENE-SIGNALING PATHWAY 51
Page 63: Gamma Field Symposia, No. 42, 2003
Page 67 and 68: MECHANISM OF BRASSINOSTEROID SIGNAL
Page 77 and 78: 68 Yoshikatsu MATSUBAYASHI are grow
Page 79 and 80: 70 Yoshikatsu MATSUBAYASHI Fig. 3.
Page 85 and 86: 76 Yoshikatsu MATSUBAYASHI 33. Yang
Page 87 and 88: 78 Yoshikatsu MATSUBAYASHI GUS
Page 89 and 90: 80 BRI1
Page 91 and 92: 82 BRI 10
Page 93 and 94: 84 100
Page 95 and 96: 86 PSK 23 BIL1/CFP
Page 97: 87 2 2
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