Effects of experimental early canopy closure on the growth and reproduction of spring ephemeral Erythronium japonicum in a montane deciduous forest

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• 作者：Hyun Jung Kim ; Jong Bin Jung ; You Lim Jang ; Joo Han Sung…
• 关键词：Leaf flushing ; Organ biomass ; Photosynthate allocation ; Reproduction ; Resource trade ; off ; Shading
• 刊名：Journal of Plant Biology
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：58
• 期：3
• 页码：164-174
• 全文大小：399 KB
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• 作者单位：Hyun Jung Kim (1)
  Jong Bin Jung (1)
  You Lim Jang (1)
  Joo Han Sung (2)
  Pil Sun Park (1)
  
  1. Department of Forest Sciences, Seoul National University, Seoul, 151-921, Korea
  2. Division of Forest Ecology, Korea Forest Research Institute, Seoul, 130-712, Korea
  
• 刊物主题：Plant Sciences; Plant Breeding/Biotechnology; Plant Genetics & Genomics; Plant Systematics/Taxonomy/Biogeography; Plant Ecology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1867-0725

文摘

Spring leaf flush and changes in the understory radiation in montane deciduous forests are major determinants of the life cycle of spring ephemerals, which complete their epigeous growth before canopy closure in spring. We compared the growth, carbon allocation, and reproduction of a spring ephemeral, Erythronium japonicum (Balrer) Decne., between the ambient (control) and early shade treatments in the field during the flowering (early-May), fruiting (mid- May), and fruit ripening periods (late-May), under the assumption of early spring canopy closure due to climate change. Carbon allocation was investigated using a 13C labelling experiment. Both sterile (non-flowering) and fertile (flowering) E. japonicum under the shade treatment showed higher specific leaf area and earlier leaf senescence than those in the ambient conditions (p < 0.05). The flowering E. japonicum concentrated on biomass allocation to the aboveground vegetative organs prior to fruiting and to reproductive and storage organs from fruiting. E. japonicum used carbohydrates stored during the previous year for vegetative growth, while the current-year photosynthates were used for the current-year reproduction. Carbon allocation to fruit began earlier under the shade treatment, demonstrating that E. japonicum allocated the current-year photosynthates more to reproduction than to vegetative organs under the early shade conditions. However, the seed size (p = 0.012) and germination rate (p = 0.008) were significantly lower under the shade treatment than under the ambient conditions, implying a potential decrease in viable seed production in the shorter high-light period. The earlier leaf flush could be a critical threat to the population maintenance of spring ephemerals such as E. japonicum.