69. セイヨウナシ果実成長に伴う植物ホルモンの濃度変動(口頭発表,植物化学調節学会第46回大会)

概要

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Plant hormones play important roles in development and ripening of fruits. Generally, auxins, gibberellins, and cytokinins are known to be required for fruit set, on the other hand, ethylene is responsible for ripening. However, especially in fruit tree, there are no reports about comprehensive analysis of plant hormones during fruit development and ripening. In this study, we analyzed the concentrations of 15 plant hormones of pear fruits in a time-course manner, from flowering to ripening. Ethylene was quantified with time after harvesting. Time-course experiments revealed the various changes in hormone concentrations during development and ripening of pear fruits. Concentrations of brassinosteroids increased from 2 month after flowering, and reached the maximum during ripening. This is the first report about the relation between brassinosteroids and ripening. Abscisic acid also showed the higher concentration at the ripening stage. This increase may be resulted from various stresses such as osmotic stress by fruit harvesting. This work was supported by the Program for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry (BRAIN).
2011-10-03