研究者詳細 - 杉浦　大輔

論文 - 杉浦　大輔

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Effects of the experimental alteration of fine roots on stomatal conductance and photosynthesis: Case study of devil maple (Acer diabolicum) in a cool temperate region

Daisuke Sugiura, Masaki Tateno

ENVIRONMENTAL AND EXPERIMENTAL BOTANY 100 巻頁： 105 - 113 2014年4月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Water is absorbed by fine roots and transported with essential substances to conduct photosynthesis in leaves. To determine how many fine roots are required to absorb adequate water and maximise photosynthesis, the effects of decreasing fine root biomass on stomatal conductance (G(s)) and photosynthetic rate (A) were evaluated using theoretical simulations and laboratory experiments. We used saplings of devil maple (Acer diabolicum), a typical woody species in the cool temperate regions of Japan, grown in high- and low-light environments. A-G(s) relationships and whole-plant hydraulic conductance (K-w) were determined and used for the simulations. Gradual changes in K-w, A, and G(s) were also evaluated with a stepwise decrease in fine roots in the laboratory experiments. The model predicted that K-w, G(s), and A decreased moderately with a decrease in fine roots. For example, A decreased by only 12% when fine roots were decreased by 50%. The model predictions were nearly consistent with the results from laboratory experiments. In conclusion, saplings of devil maple produced fine roots that were more than sufficient in meeting the water demands of photosynthesis. These characteristics may be beneficial in surviving severe drought and in maintaining adequate hydraulic conductance under conditions of moderate water stress. (C) 2014 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.envexpbot.2013.12.020

Web of Science

High CO2 triggers preferential root growth of Arabidopsis thaliana via two distinct systems under low pH and low N stresses. 査読有り

Hachiya T, Sugiura D, Kojima M, Sato S, Yanagisawa S, Sakakibara H, Terashima I, Noguchi K

Plant & cell physiology 55 巻 ( 2 ) 頁： 269 - 280 2014年2月

Concentrative nitrogen allocation to sun-lit branches and the effects on whole-plant growth under heterogeneous light environments 査読有り

Sugiura D

Oecologia 172 巻 ( 4 ) 頁： 949-960 2013年

Long-term, short-interval measurements of the frequency distributions of the photosynthetically active photon flux density and net assimilation rate of leaves in a cool-temperate forest

Ayana Miyashita, Daisuke Sugiura, Koichiro Sawakami, Ryuji Ichihashi, Tomokazu Tani, Masaki Tateno

AGRICULTURAL AND FOREST METEOROLOGY 152 巻頁： 1 - 10 2012年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

Long-term, short-interval measurements of incident photosynthetically active photon flux density (PPFD; mu mol m(-2) s(-1)) on the forest floor are essential for estimating the leaf carbon gain of understory plants. Such PPFD data, however, are scarce. We measured PPFD at 1-min intervals for more than 12 months in cool-temperate forest sites and reported the data as a PPFD frequency distribution. We chose five sites: an open site (OPN), the understory of a deciduous broad-leaved tree stand with no visible gaps (DCD), that of an evergreen conifer stand (EVG), that of a deciduous broad-leaved tree stand with a gap of approximately 80 m(2) (GAPDCD), and that of an evergreen conifer stand with a gap of approximately 100 m(2) (GAPEVG). DCD were divided into three sub sites (DCD1-3) to investigate variation within a small area. GAP-sites were consisted of two sub sites (GAPDCD1-2 and GAPEVG1-2) differing in the distance from the gap center. Using the PPFD data, we estimated the summer seasonal (May-October) net assimilation rate of leaves (NAR(L)) at each site for various photosynthetic capacities (A(max): mu mol m(-2) s(-1)) and other parameters of a light response curve of CO2 assimilation rates. At OPN, the average daily accumulated PPFD (mol m(-2) day(-1)) was highest in May (28.2) and lowest in December (8.2). Even at OPN, the class of instantaneous PPFD that contributed most to NAR(L) was 250-300 mu mol m(-2) s(-1). Such a large contribution of lower PPFD is suggested to be an important feature of a field light-availability. At DCD, the relative PPFD (RPPFD, %) to OPN was 7.2 during canopy closure and 49.4 after leaf shedding (averaged for 3 sites). EVG had the lowest light environment throughout the year. Its average RPPFD was 3%. For GAP sites, summer seasonal RPPFD (%) was 15.6, 18.8, 6.4 and 15.6 for GAPDCD1, GAPDCD2, GAPEVG1 and GAPEVG2, respectively. At OPN, the NAR(L) increased with A(max) (which ranged from 1 to 40), suggesting that plants at OPN do not maximize NAR(L). In contrast, at DCD and EVG, A(max) values were attained that did maximize NAR(L), suggesting that plants at these sites could maximize the NAR(L). A(max)-NAR(L) relationships for GAPDCD and GAPEVG showed similar trend to closed canopy sites, DCD and EVG, while NAR(L) and A(max)* of GAP sites were larger than at these sites. Among DCD1-3, the daily accumulated PPFD (mol m-2 day-1) averaged in summer ranged 1.3-1.8 and the maximum NAR(L) value differed up to 1.5 times. It indicates that A(max) and NAR(L) can be various among plants under a similar canopy conditions. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.agrformet.2011.08.001

Web of Science

Optimal leaf-to-root ratio and leaf nitrogen content determined by light and nitrogen availabilities. 査読有り

Sugiura D, Tateno M

PloS one 6 巻 ( 7 ) 頁： e22236 2011年7月

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