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Photosynthetic compensation by the reproductive structures in the spring ephemeral Gagea lutea

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Title: Photosynthetic compensation by the reproductive structures in the spring ephemeral Gagea lutea
Authors: Sunmonu, Ninuola Browse this author
Ida, Takashi Y. Browse this author
Kudo, Gaku Browse this author →KAKEN DB
Keywords: Carbon fixation
Non-foliar photosynthesis
Reproductive compensation
Spring ephemerals
Issue Date: Feb-2013
Publisher: Springer Netherlands
Journal Title: Plant Ecology
Volume: 214
Issue: 2
Start Page: 175
End Page: 188
Publisher DOI: 10.1007/s11258-012-0157-7
Abstract: Growth and reproduction of spring ephemerals inhabiting deciduous forests progress simultaneously during a short period from snowmelt to canopy closure. To clarify the mechanism to mitigate the cost of reproduction, contributions of foliar and non-foliar photosynthetic products to seed production were examined in a spring ephemeral Gagea lutea. Leaf growth, foliar and non-foliar photosynthetic activities, and total assimilated products were compared among reproductive-intact, floral-bud removal and vegetative plants. Translocation of current photosynthetic products to individual organs was quantified by 13CO2-trace experiment. Bulb growth was compared between hand-pollination and floral-bud removal treatments. Finally, seed set was compared between intact, leaf-clipping and bract-clipping treatments. Fruit-forming plants retained leaves longer than vegetative and floral-bud removal plants, but the assimilative contribution of extended leaf longevity was negligible. Carbon supply by bract photosynthesis was large enough for fruit development, while carbon supply by fruit photosynthesis was offset by the high respiration loss. Foliar photosynthetic products were largely transported to bulbs, while translocation to reproductive functions was negligible. Because the floral-bud removal increased the bulb growth, lack of reproduction could lead to more storage. The leaf-clipping had no effect on seed production, while the bract-clipping significantly reduced the seed production. Therefore, current photosynthesis of leafy bracts might be a major carbon source for fruit development. This self-compensative mechanism of reproductive structure enables the continuous reproductive activity in this species.
Rights: The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/52256
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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