45. トレハロースは全寄生植物ヤセウツボの発芽を促進する

概要

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Seeds of Orobanche minor Sm., a root holoparasitic angiosperm, require a conditioning period at 20-26℃ with high humidity for several days to break dormancy. Additionally, the germination cannot occur after conditioning unless they are exposed to germination stimulants naturally released from roots of host plants. To obtain information about complex mechanism of the seed germination of the holoparasite, GC/MS analysis of primary metabolites in the seeds during the conditioning and the germination periods was performed. About 20 compounds, mainly organic acids, amino acids, and sugars were identified. The amounts of compounds remained almost constant during the conditioning period except trehalose whose level had been found to increase remarkably. Germination tests adding trehalose during the conditioning and the germination periods were performed. The results showed that trehalose promoted the seed germination in both periods, even in the conditions with germination inhibitors such as abscisic acid and glucose were present. However, it did not promote the seed germination at high temperature (30℃). These results suggested that trehalose synthesized during the conditioning period promotes the seed germination of O. minor.
植物化学調節学会の論文
2005-10-13