| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
In this study, we examined the breeding system and its evolutionary pathway of Psychotria manillensis in the Ryukyu Islands. I found P. manillensis had polygamous breeding system mainly with monoecious, female, and some male and hermaphroditic individuals, and it was pollinated mostly by flies and wasps. Most species in the genus Psychotria are distylous, and distyly is thought to be an ancestral character of the genus. It is a first discovery of monoecism not only in the genus Psychotria but also in all heterostylous species group. It is difficult to explain the evolution from distyly to monoecy only by plant-pollinator interactions. P. manillensis is octoploid, and its closely related ally, P. rubra is tetraploid. If we put this ploidy levels into consideration, the evolution of monoecism in P. manillensis can be linked to polyploidization.
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