Defense characteristics of seral deciduous broad-leaved tree seedlings grown under differing levels of CO2 and nitrogen

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概要

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• Mixed broad-leaved forests are abundantly populated by several kinds of herbivore species in northern Japan. The life of herbivores depends strongly on the quality of food leaves. Leaf quality is changing with increasing atmospheric CO2 and nitrogen deposition. Four seral species of deciduous broad-leaved tree seedlings (alder, birch, oak and maple) were raised in all four combinations of two levels of CO2 and two levels of nutrient, to examine foliar defense traits. To evaluate the relative defense capacity of the four tree species, we used wild silkworms (Erisan; a generalist herbivore) as a bioassay material. Except with alder, the survival rate and longevity (ML50) of the silkworms were least when they were fed with leaves of seedlings raised under high CO2 and infertile soil conditions, and longest on a diet of leaves grown in ambient CO2 and fertile soil, especially in birch and maple. The longevity of Erisan decreased in the order birch, oak and maple. The longevity of Erisan fed with alder leaves was independent of CO2 levels and was longer on alder seedlings grown in infertile soil conditions. Alder is an actinorrhizal plant that can fix atmospheric nitrogen in root nodules formed by the actinomycetes Frankia sp. The activity of symbiotic microbes would have been enhanced by the greater amount of photosynthates received from the host plants at high CO2, improving the food quality for the silkworms. All but alder, leaf chemical traits especially C/N ratio were concluded to affect ML50 of Erisan larvae.

• Springer-Verlag Tokyo Inc.の論文
• 2006-01-01

著者

• Takagi Kentaro

  Teshio Experimental Forest Field Science Center For Northern Biosphere Hokkaido University

• Maruyama Yutaka

  Forestry And Forest Products Res. Inst. Sapporo Jpn

• KOIKE Takayoshi

  Hokkaido University Forests, FSC, Hokkaido University

• TOBITA Hiroyuki

  Forestry and Forest Products Research Institute

• SHIBATA Takanori

  Graduate School of Agriculture, Hokkaido University

• MATSUKI Sawako

  Graduate School of Agriculture, Hokkaido University

• KONNO Kotaro

  National Institute for Agrobiological Sciences

• KITAO Mitsutoshi

  Forestry and Forest Products Research Institute

• YAMASHITA Naoko

  Forestry and Forest Products Research Institute

• Koike Takayoshi

  Southern Forestry And Development Office Field Science Center For Northern Biosphere Hokkaido Univer

• Matsuki Sawako

  Graduate School Of Agriculture Hokkaido University

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