| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
|
|---|
| Outline of Final Research Achievements |
Amborella trichopoda Bail., a sister group to all other angiosperms, was investigated with respect to the significance of its dioecy and the development of a unique cup-shaped structure of staminal flowers. Results showed that A. trichopoda originally had bisexual flowers, and that a centripetal differentiation of stamens prolongs a period of anthesis, compensating a loss of reproductive efficiency due to dioecy. The cup-shaped receptacle of staminate flowers is likely to protect developing stamens. A reinvestigation of female gametophyte structure revealed that it comprises 10 nuclei in nine cells. Its archegonium consists of one egg cell and four synergids as in cycads and Ginkgo of gymnosperms.
|
