ISHS Acta Horticulturae 773: XXVII International Horticultural Congress - IHC2006: International Symposium on Citrus and Other Tropical and Subtropical Fruit Crops
FLOWER ABSCISSION CONTRIBUTES TO ARBUSCULAR MYCORRHIZAL DEVELOPMENT IN TRIFOLIATE ORANGE AND PEACH ROOTS |
| Authors: | T. Ishii, H. Motosugi, M. Nakano, A. Matsumura, S. Horii |
| Keywords: | arbuscular mycorrhiza, flavonoids, polyamines |
| Abstract:
Effects of Satsuma mandarin and peach flowers applied to the soil on tree growth and arbuscular mycorrhizal fungal (AMF) root colonization were investigated. Moreover, AMF growth stimulants such as flavonoids and polyamines in Satsuma mandarin flowers were identified. The flowers of Satsuma mandarin ‘Okitsu Wase’ and peach ‘Sanyo Suimitsu’ were separately applied to the pots transplanted with non-mycorrhizal trifoliate orange and peach ‘Ohatsumomo’ seedlings, and then the pots were inoculated with an AMF, Gigaspora margarita Becker and Hall. Forty days after the flower application, every flower application increased the rate of AMF root colonization and colonization at the highest flower rates was significantly higher. Both trees treated with flowers also became more vigorous compared to the control. In Satsuma mandarin flowers, we identified rutin, narirutin and hesperidin as flavonoids, and spermidine and traces of putrescine as polyamines. The concentrations of rutin, narirutin, hesperidin and spermidine were 13.5, 107.1, 5.2 and 6800 μg per 1 g fresh weight of the flowers, respectively. In particular, narirutin and spermidine in the flowers existed at concentrations high enough to stimulate the growth of G. margarita. | |
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