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Selective Mimics of Strigolactone Actions and Their Potential Use for Controlling Damage Caused by Root Parasitic Weeds

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Molecular Plant 2013年第1期6卷 88-99页

作者： Kosuke Fukui shinsaku ito Tadao Asami Graduate School of Agricultural and Life Sciences University of Tokyo 1-1-1 Yayoi Bunkyo Tokyo Japan 113-8657 JST CREST 1-1-1 Yayoi Bunkyo Tokyo Japan 113-8657

Strigolactones （SLs） are a novel class of plant hormones and rhizosphere communication signals, although the molecular mechanisms underlying their activities have not yet been fully determined. Nor is their application in agriculture well developed. The importance of plant hormone agonists has been demonstrated in both basic and applied research, and chemicals that mimic strigolactone functions should greatly facilitate strigolactone research. Here, we report our discovery of a new phenoxyfuranone compound, 4-Br debranone （4BD）, that shows similar activity to that of the major strigolactone （SL） analog GR24 in many aspects of a biological assay on plants. 4BD strongly inhibited tiller bud outgrowth in the SL-deficient rice mutant d10 at the same concentration as GR24, with no adverse effects, even dur- ing prolonged cultivation. This result was also observed in the Arabidopsis thaliana SL-deficient mutants max1, max3, and max4. However, the application of 4BD to the Arabidopsis SL-insensitive mutant max2 induced no morphological changes in it. The expression of SL biosynthetic genes was also reduced by 4BD treatment, probably via negative feed- back regulation. However, in a seed germination assay on Striga hermonthica, a root parasitic plant, 4BD showed far less activity than GR24. These results suggest that 4BD is the first plant-specific strigolactone mimic.

关键词： strigolactones plant growth regulator Arabidopsis rice debranone branching tillering.

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An Ancestral Gibberellin in a Moss Physcomitreila patens

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Molecular Plant 2018年第8期11卷 1097-1100页

作者： Sho Miyazaki Mariho Hara shinsaku ito Keisuke Tanaka Tadao Asami Ken-ichiro Hayashi Hiroshi Kawaide Masatoshi Nakajima Department of Applied Biological Chemistry The University of Tokyo Tokyo 113-8657 Japan Department of Bioscience Faculty of Applied Bioscience Tokyo University of Agriculture Tokyo 156-8502 Japan NODAI Genome Research Center Tokyo University of Agriculture Tokyo 156-8502 Japan Department of Biochemistry Okayama University of Science Okayama 700-0005 Japan Institute of Agriculture Tokyo University of Agriculture and Technology Tokyo 183-8509 Japan

Dear Editor,Most of the plant hormones found in flowering plants contribute to growth regulation in the moss Physcomitrella patens. This moss does not produce gibberellin （GA）（Figure 1A）. An ent-kaurene synthase （PpCPS/KS） and an ent-kaurene oxidase （PpKO） have been identified in P. patens, but in contrast to flowering plants, P. patens has no ent-kaurenoic acid oxidase （KAO） homologs （Hayashi et al., 2010; Miyazaki et al., 2011, Fiqure 1A）.

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