Tryptophan dimer produced by water-stressed bahia grass is an attractant for <Emphasis Type="Italic">Gigaspora margarita</Emphasis> and <Emphasis Type="Italic">Glomus caledonium</Emphasis> |
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Authors: | Sachie Horii Atsushi Matsumura Makoto Kuramoto Takaaki Ishii |
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Institution: | (1) Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522, Japan;(2) Integrated Center for Science, Department of Molecular Science, Division of Synthesis and Analysis, Ehime University, Ehime 790-8577, Japan |
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Abstract: | We isolated and elucidated the structure of several stimulants for arbuscular mycorrhizal fungi (AMF) in water-stressed bahia
grass roots. We could isolate some compounds that promoted the growth of Gigaspora margarita Becker and Hall and Glomus caledonium (Nicol. and Gerd.) Trappe and Gerd. In these compounds, tryptophan dimer (Trp–Trp) was elucidated the structure. Trp–Trp
was abundantly produced in water-stressed bahia grass roots and exuded to the soil, although it was scarcely detected in non-stressed
root exudates. Interestingly, this peptide strongly attracted the hyphae of Gi. margarita and G. caledonium and promoted their hyphal growth in vitro (1.8 × longer than the control). Tryptophan, however, had no effect on hyphal growth
and attraction. Thus, Trp–Trp exuded from water-stressed roots would play an important role as a major signal for AMF.
An erratum to this article can be found at |
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Keywords: | Arbuscular mycorrhizal fungi Tryptophan dimer Water stress Bahia grass Attractant |
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