| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2016: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
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| Outline of Final Research Achievements |
Winter annuals have differentiated into two life history types; obligate and facultative. The aims of this study are to identify key traits for the differentiation and to decide responsible genes for the traits. Obligate annuals flower after overwintering with rosette forms. Whereas in facultative annuals, spring-germinating plants flower quickly without having the rosette stage. When non-germinating imbibed-seed of Conyza canadensis, a facultative annual, had been exposed to low temperature, an early flowering trait of the resultant plant was induced. This trait is called seed vernalization. Thus the seed vernalization is the key trait for the life history differentiation between two winter annuals.
We isolated a candidate gene of seed vernalization, PSV, in C. canadensis. The expression pattern of PSV coincided with that of seed vernalization. No PSV homolog was found in known flowering genes. We conclude PSV should be the novel gene that regulates seed vernalization.
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