| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
In this study, we examined the seasonal variations of IAA (indole acetic acid) amounts, GA4 (gibberellic acid) amounts in cambial region tissues and xylem formation in conifers with different characteristics of xylem formation. The obtained results were as follows; ①In the year with smaller precipitations, some sugi cultivar trees formed latewood actively, and had large GA4 amounts in cambial region tissues, ②There was significant positive correlation between IAA amounts and the number of tracheids formed until June, although GA4 amounts had no significant effects on xylem formation in sugi cultivar trees grown in different tree density, ③Slash pine, conifer with large latewood percentage, had large IAA amounts in cambial region tissues and actively formed latewood in November. It was assumed that large IAA amounts enhanced the activity of cambium during latewood formation.
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