| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Research Abstract |
Angiosperm suspensors function at early stages of embryogenesis by holding the growing embryo in a fixed position, and providing a route for nutrients transport to the embryo proper. The suspensors develop fully, before the cotyledons initiate, and degenerate subsequently, i.e., the suspensors are subject to programmed cell-death (PCD) before the maturation of embryos. In the present study, a comparative study of the embryo and suspensor development of 66 leguminous species was done using paraffin sectioning method. As the results, I found two types of suspensors, i.e., longer-lived one and shorter-lived one. The longer-lived ones persist at least until the early cotyledon stage, and the shorter-lived ones separate from the wall of the embryo sac or disappear at the early cotyledon stage. The evolutional polarity of leguminous suspensors would be that from the longer-lived one to the shorter-lived one. After PCD of shorter-lived suspensors, their functions would be taken over by another tissue.
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