| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
To investigate the effects of light quality (wavelength) on freezing tolerance and dormancy progression in Japanese pear (Pyrus pyrifolia (Burm. f.) Nakai), we treated potted Japanese pear trees with the red, far-red, and blue light with LEDs daily between sunset and sunrise from autumn (September or October) until spring (March or April) in the successive three years. Resultantly, we found that light treatment did not affect the freezing tolerance of pear flower buds and shoot. However, trees irradiated with blue light flowered earlier than non-treated control, whereas those with far-red light did flower later. We consider that light quality may affect the dormancy progression and then change flowering time of pear trees.
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