48. カプセル化による根寄生雑草種子発芽刺激物質の安定化

概要

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The genera Striga and Orobanche comprise serious and debilitating obligate root parasitic weeds on several economically important poaceous and leguminous crops. Prodigious seed production, prolonged seed viability and special germination requirements make Striga and Orobanche species difficult weeds to control. To germinate the seeds require a pre-treatment in a warm moist environment and a subsequent exposure to a germination stimulant. In nature, the stimulant is exuded by roots of host and some non-host plants. Natural germination stimulants, strigolactones, were isolated, identified and active structural analogues were prepared. Induction of germination, in absence of host plants, suicidal germination, leads to depletion of the seed reserves in soils. However, the natural stimulants and their structural analogues are extremely labile and proved to be ineffective under practical field conditions. Current research in our laboratory on slow release formulations of GR24, a synthetic germination stimulant, indicates that encapsulation increased persistence and resulted in prolonged activity of the compound. Increased persistence and prolonged activity of the compound make adoption of suicidal germination, as an effective and practical means for controlling Striga and Orobanche under field conditions, an intriguing possibility.
植物化学調節学会の論文
2005-10-13