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How do sink and source activities influence the reproduction and vegetative growth of spring ephemeral herbs under different light conditions?

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Title: How do sink and source activities influence the reproduction and vegetative growth of spring ephemeral herbs under different light conditions?
Authors: Sunmonu, Ninuola Browse this author
Kudo, Gaku Browse this author →KAKEN DB
Keywords: Canopy closure
Carbon fixation
Cost of reproduction
Spring ephemerals
Seed production
Photosynthesis
Issue Date: Jul-2014
Publisher: Springer
Journal Title: Journal of Plant Research
Volume: 127
Issue: 4
Start Page: 503
End Page: 511
Publisher DOI: 10.1007/s10265-014-0640-4
PMID: 24879401
Abstract: Spring ephemeral herbs inhabiting deciduous forests commonly complete reproduction and vegetative growth before canopy closure in early summer. Effects of shading by early canopy closure on reproductive output and vegetative growth, however, may vary depending on the seasonal allocation patterns of photosynthetic products between current reproduction and storage for future growth in each species. To clarify the effects of sink-source balance on seed production and bulb growth in a spring ephemeral herb, Gagea lutea, we performed a bract removal treatment (source reduction) and a floral-bud removal treatment (sink reduction) under canopy and open conditions. Leaf carbon fixations did not differ between the forest and open sites and among treatments. Bract carbon fixations were also similar between sites but tended to decrease when floral buds were removed. Seed production was higher under open condition but decreased by the bract-removal treatment under both light conditions. In contrast, bulb growth was independent of light conditions and the bract-removal treatment but increased greatly by the bud-removal treatment. Therefore, leaves and bracts acted as specialized source organs for vegetative and reproductive functions, respectively, but photosynthetic products by bracts were flexibly used for bulb growth when plants failed to set fruits. Extension of bright period was advantageous for seed production (i.e., source limited) but not for vegetative growth (i.e., sink limited) in this species.
Rights: The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/59454
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 岳

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