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Growth and photosynthetic traits of hybrid larch F1 (Larix gmelinii var. japonica x L. kaempferi) under elevated CO2 concentration with low nutrient availability

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Title: Growth and photosynthetic traits of hybrid larch F1 (Larix gmelinii var. japonica x L. kaempferi) under elevated CO2 concentration with low nutrient availability
Authors: Watanabe, Makoto Browse this author →KAKEN DB
Watanabe, Yoko Browse this author →KAKEN DB
Kitaoka, Satoshi Browse this author
Utsugi, Hajime Browse this author →KAKEN DB
Kita, Kazuhito Browse this author
Koike, Takayoshi Browse this author →KAKEN DB
Keywords: acclimation to high CO2
Larix gmelinii var. japonica x Larix kaempferi
needle characteristics
nitrogen allocation
nutrient condition
photosynthetic adjustment
Issue Date: Sep-2011
Publisher: Oxford University Press
Journal Title: Tree Physiology
Volume: 31
Issue: 9
Start Page: 965
End Page: 975
Publisher DOI: 10.1093/treephys/tpr059
Abstract: The hybrid larch F1 (Larix gmelinii var. japonica x Larix kaempferi) is considered as one of the most important tree species not only for timber production but also as an afforestation material for severe conditions such as infertile soil. To predict the ability of hybrid larch F1 as an afforestation material under potential climates in the future, it is important to understand the response of hybrid larch F1 to elevated CO2 concentration ([CO2]) under low nutrient availability. Three-year-old seedlings of hybrid larch F1 were grown under two different levels of [CO2], 360 (ambient) and 720 μmol mol^[-1] (elevated), in combination with two different levels of nitrogen (N) supply (0 and 30 kg ha^[-1]) for one growing season. Elevated [CO2] reduced the maximum rates of carboxylation and electron transport in the needles. Net photosynthetic rates at growth [CO2] (i.e., 360 and 720 μmol mol^[-1] for ambient and elevated treatment, respectively) did not differ between the two CO2 treatments. Reductions in the N content and the N use efficiency to perform photosynthetic functions owing to the deficiency of nutrients other than N, such as P and K, and/or increase of cell wall mass were considered as the factors of photosynthetic down-regulation under elevated [CO2], whereas stomatal closure little affected the photosynthetic down-regulation. Although we observed strong down-regulation of photosynthesis, the dry matter increase of hybrid larch F1 seedlings was enhanced under elevated [CO2]. This is mainly attributable to the increase in the amount of needles with increasing the number of sylleptic branches. These results suggest that elevated CO2 may increase growth of hybrid larch F1 even under low nutrient availability, and that this increase may be regulated by both changes in crown architecture and in needle photosynthesis, which is mainly affected by not stomatal limitation but by biochemical limitation.
Rights: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Tree Physiology following peer review. The definitive publisher-authenticated version Tree Physiol (2011) 31 (9): 965-975 is available online at: http://treephys.oxfordjournals.org/content/31/9/965
Type: article (author version)
URI: http://hdl.handle.net/2115/49706
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡辺 誠

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