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Photosynthetica

, Volume 50, Issue 3, pp 422–428 | Cite as

Photosynthesis and nitrogen allocation in needles in the sun and shade crowns of hybrid larch saplings: effect of nitrogen application

  • Q. Z. Mao
  • M. Watanabe
  • M. Imori
  • Y. S. Kim
  • K. Kita
  • T. Koike
Article

Abstract

We studied the effects of applying 50 kg(N) ha−1 year−1 of nitrogen (N) on needle photosynthesis, N allocation and nutrient content in the sun- and shade crowns of the hybrid larch F1 (Larix gmelinii var. japonica × L. kaempferi). The light-saturated net photosynthetic rate (P Nmax) was not significantly affected by N application or crown position, although the contents of N, P, K, and chlorophyll (Chl), and the maximum rates of carboxylation and electron transport were lower in needles of the shade crown than of the sun crown. This difference was mainly due to an increase in the intercellular CO2 concentration (C i) in the needles of the shade crown. Analysis of N allocation in photosynthetic systems revealed that more N was allocated to functions related to electron transport and ribulose-1,5-bisphosphate (RuBP) regeneration in needles of the shade crown. N allocation in needles of the hybrid larch F1 was regulated mainly by the light conditions, rather than by N application

Additional key words

foliar nutrient hybrid larch nitrogen deposition sun- and shade needles 

Abbreviations

Ca

external CO2 concentration

Ci

intercellular CO2 concentration

Ca

calcium

Chl

chlorophyll

gs

stomatal conductance of water vapor

Jmax

maximum rate of electron transport

K

potassium

Kc

value of Rubisco Michaelis constants for CO2

Ko

value of Rubisco Michaelis constants for O2

LHCP

light-harvesting chlorophyll complex protein

LMA

leaf mass per area

Mg

magnesium

N

nitrogen

N1

nitrogen allocated in light-harvesting chlorophyll complex protein and photosystems

N2

nitrogen allocated in bioenergetics (electron carriers except for photosystems, coupling factor and Calvin cycle enzymes except for Rubisco)

N3

nitrogen allocated in Rubisco

N4

nitrogen allocated in other components in needle

Nm

N content per unit leaf mass

P

phosphorus

Pmax

net assimilation rate at 1,700 μmol mol−1 CO2

PN

net assimilation rate

PNmax

light-saturated net photosynthetic rate

PNUE

photosynthetic nitrogen-use efficiency

PPF

photosynthetic photon flux

Vcmax

maximum rate of carboxylation

Vcr

the specific activity of Rubisco

Γ*

CO2 compensation point in the absence of dark respiration

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Q. Z. Mao
    • 1
  • M. Watanabe
    • 1
  • M. Imori
    • 1
  • Y. S. Kim
    • 1
  • K. Kita
    • 2
  • T. Koike
    • 1
  1. 1.Silviculture and Forest Ecological StudiesHokkaido UniversitySapporo, HokkaidoJapan
  2. 2.Forestry Research InstituteHokkaido Research OrganizationBibaiJapan

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