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Concurrent changes in net CO2 assimilation and chloroplast ultrastructure in nitrogen deficient citrus leaves

Identifieur interne : 000387 ( PascalFrancis/Curation ); précédent : 000386; suivant : 000388

Concurrent changes in net CO2 assimilation and chloroplast ultrastructure in nitrogen deficient citrus leaves

Auteurs : Bhaskar R. Bondada [États-Unis] ; James P. Syvertsen [États-Unis]

Source :

RBID : Pascal:05-0305098

Descripteurs français

English descriptors

Abstract

To elucidate a mechanistic basis for the reductions in chlorophyll (Chl) and inhibition of CO2 assimilation (ACO2) in nitrogen (N) starved citrus leaves, changes in Chl concentration and net gas exchange rates were examined together with chloroplast ultrastructure in N-deficient (125 mmol N m-2) and N-sufficient (286 mmol N m-2) citrus leaves. Two-year-old 'Hamlin' orange (Citrus sinensis L.) trees were field-grown with and without N. N-deficient leaves exhibited smaller chloroplasts (3.30 μm in length) with reduced Chl concentration per unit area (0.06 mmol N m-2), but a greater Chl a/b ratio (3.7) than the N-sufficient leaves. The reductions in Chl and ACO2 of N-deficient leaves paralleled with high intercellular CO2 concentration (Ci; 259 ppm) in the mesophyll and prodigious accumulation of starch granules (2.71 μm2) in the chloroplasts. Starch granules significantly reduced stroma size and caused disassembly and disruption of the internal membrane system, the grana and stroma lamellae. Concomitant with destruction of membrane assembly was the presence of numerous large plastoglobuli (15 in number). In contrast, ACO2 increased and Ci declined in N-sufficient leaves. Furthermore, chloroplasts from N-sufficient leaves had well-developed grana and stroma lamellae in parallel alignment with a few small or no starch granules in the large stroma. Thus, it appeared that the loss of chloroplast ultrastructural integrity brought about by starch accumulation facilitated reductions in Chl concentration and CO2 assimilation in N-deficient citrus leaves.
pA  
A01 01  1    @0 0098-8472
A02 01      @0 EEBODM
A03   1    @0 Environ. exp. bot.
A05       @2 54
A06       @2 1
A08 01  1  ENG  @1 Concurrent changes in net CO2 assimilation and chloroplast ultrastructure in nitrogen deficient citrus leaves
A11 01  1    @1 BONDADA (Bhaskar R.)
A11 02  1    @1 SYVERTSEN (James P.)
A14 01      @1 Citrus Research and Education Center, University of Florida, 700 Experiment Station Road @2 Lake Alfred, FL 33850 @3 USA @Z 1 aut. @Z 2 aut.
A20       @1 41-48
A21       @1 2005
A23 01      @0 ENG
A43 01      @1 INIST @2 9462 @5 354000138161040050
A44       @0 0000 @1 © 2005 INIST-CNRS. All rights reserved.
A45       @0 1 p.1/4
A47 01  1    @0 05-0305098
A60       @1 P
A61       @0 A
A64 01  1    @0 Environmental and experimental botany
A66 01      @0 NLD
C01 01    ENG  @0 To elucidate a mechanistic basis for the reductions in chlorophyll (Chl) and inhibition of CO2 assimilation (ACO2) in nitrogen (N) starved citrus leaves, changes in Chl concentration and net gas exchange rates were examined together with chloroplast ultrastructure in N-deficient (125 mmol N m-2) and N-sufficient (286 mmol N m-2) citrus leaves. Two-year-old 'Hamlin' orange (Citrus sinensis L.) trees were field-grown with and without N. N-deficient leaves exhibited smaller chloroplasts (3.30 μm in length) with reduced Chl concentration per unit area (0.06 mmol N m-2), but a greater Chl a/b ratio (3.7) than the N-sufficient leaves. The reductions in Chl and ACO2 of N-deficient leaves paralleled with high intercellular CO2 concentration (Ci; 259 ppm) in the mesophyll and prodigious accumulation of starch granules (2.71 μm2) in the chloroplasts. Starch granules significantly reduced stroma size and caused disassembly and disruption of the internal membrane system, the grana and stroma lamellae. Concomitant with destruction of membrane assembly was the presence of numerous large plastoglobuli (15 in number). In contrast, ACO2 increased and Ci declined in N-sufficient leaves. Furthermore, chloroplasts from N-sufficient leaves had well-developed grana and stroma lamellae in parallel alignment with a few small or no starch granules in the large stroma. Thus, it appeared that the loss of chloroplast ultrastructural integrity brought about by starch accumulation facilitated reductions in Chl concentration and CO2 assimilation in N-deficient citrus leaves.
C02 01  X    @0 002A32C03A4
C03 01  X  FRE  @0 Assimilation @5 01
C03 01  X  ENG  @0 Assimilation @5 01
C03 01  X  SPA  @0 Asimilación @5 01
C03 02  X  FRE  @0 Chloroplaste @5 02
C03 02  X  ENG  @0 Chloroplast @5 02
C03 02  X  SPA  @0 Cloroplasto @5 02
C03 03  X  FRE  @0 Feuille végétal @5 03
C03 03  X  ENG  @0 Plant leaf @5 03
C03 03  X  SPA  @0 Hoja vegetal @5 03
C03 04  X  FRE  @0 Chlorophylle b @5 04
C03 04  X  ENG  @0 Chlorophyll b @5 04
C03 04  X  SPA  @0 Clorofila b @5 04
C03 05  X  FRE  @0 Inhibition @5 05
C03 05  X  ENG  @0 Inhibition @5 05
C03 05  X  SPA  @0 Inhibición @5 05
C03 06  X  FRE  @0 Echange gazeux @5 06
C03 06  X  ENG  @0 Gas exchange @5 06
C03 06  X  SPA  @0 Intercambio gaseoso @5 06
C03 07  X  FRE  @0 Amidon @5 07
C03 07  X  ENG  @0 Starch @5 07
C03 07  X  SPA  @0 Almidón @5 07
C03 08  X  FRE  @0 Chlorophylle a @5 08
C03 08  X  ENG  @0 Chlorophyll a @5 08
C03 08  X  SPA  @0 Clorofila a @5 08
C03 09  X  FRE  @0 Citrus sinensis @2 NS @5 10
C03 09  X  ENG  @0 Citrus sinensis @2 NS @5 10
C03 09  X  SPA  @0 Citrus sinensis @2 NS @5 10
C03 10  X  FRE  @0 Carbone dioxyde @2 NK @2 FX @5 15
C03 10  X  ENG  @0 Carbon dioxide @2 NK @2 FX @5 15
C03 10  X  SPA  @0 Carbono dióxido @2 NK @2 FX @5 15
C07 01  X  FRE  @0 Rutaceae @2 NS
C07 01  X  ENG  @0 Rutaceae @2 NS
C07 01  X  SPA  @0 Rutaceae @2 NS
C07 02  X  FRE  @0 Dicotyledones @2 NS
C07 02  X  ENG  @0 Dicotyledones @2 NS
C07 02  X  SPA  @0 Dicotyledones @2 NS
C07 03  X  FRE  @0 Angiospermae @2 NS
C07 03  X  ENG  @0 Angiospermae @2 NS
C07 03  X  SPA  @0 Angiospermae @2 NS
C07 04  X  FRE  @0 Spermatophyta @2 NS
C07 04  X  ENG  @0 Spermatophyta @2 NS
C07 04  X  SPA  @0 Spermatophyta @2 NS
N21       @1 213
N44 01      @1 OTO
N82       @1 OTO

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Pascal:05-0305098

Le document en format XML

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<div type="abstract" xml:lang="en">To elucidate a mechanistic basis for the reductions in chlorophyll (Chl) and inhibition of CO
<sub>2</sub>
assimilation (A
<sub>CO2</sub>
) in nitrogen (N) starved citrus leaves, changes in Chl concentration and net gas exchange rates were examined together with chloroplast ultrastructure in N-deficient (125 mmol N m
<sup>-2</sup>
) and N-sufficient (286 mmol N m
<sup>-2</sup>
) citrus leaves. Two-year-old 'Hamlin' orange (Citrus sinensis L.) trees were field-grown with and without N. N-deficient leaves exhibited smaller chloroplasts (3.30 μm in length) with reduced Chl concentration per unit area (0.06 mmol N m
<sup>-2</sup>
), but a greater Chl a/b ratio (3.7) than the N-sufficient leaves. The reductions in Chl and A
<sub>CO2</sub>
of N-deficient leaves paralleled with high intercellular CO
<sub>2</sub>
concentration (Ci; 259 ppm) in the mesophyll and prodigious accumulation of starch granules (2.71 μm
<sup>2</sup>
) in the chloroplasts. Starch granules significantly reduced stroma size and caused disassembly and disruption of the internal membrane system, the grana and stroma lamellae. Concomitant with destruction of membrane assembly was the presence of numerous large plastoglobuli (15 in number). In contrast, A
<sub>CO2</sub>
increased and Ci declined in N-sufficient leaves. Furthermore, chloroplasts from N-sufficient leaves had well-developed grana and stroma lamellae in parallel alignment with a few small or no starch granules in the large stroma. Thus, it appeared that the loss of chloroplast ultrastructural integrity brought about by starch accumulation facilitated reductions in Chl concentration and CO
<sub>2</sub>
assimilation in N-deficient citrus leaves.</div>
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<s0>To elucidate a mechanistic basis for the reductions in chlorophyll (Chl) and inhibition of CO
<sub>2</sub>
assimilation (A
<sub>CO2</sub>
) in nitrogen (N) starved citrus leaves, changes in Chl concentration and net gas exchange rates were examined together with chloroplast ultrastructure in N-deficient (125 mmol N m
<sup>-2</sup>
) and N-sufficient (286 mmol N m
<sup>-2</sup>
) citrus leaves. Two-year-old 'Hamlin' orange (Citrus sinensis L.) trees were field-grown with and without N. N-deficient leaves exhibited smaller chloroplasts (3.30 μm in length) with reduced Chl concentration per unit area (0.06 mmol N m
<sup>-2</sup>
), but a greater Chl a/b ratio (3.7) than the N-sufficient leaves. The reductions in Chl and A
<sub>CO2</sub>
of N-deficient leaves paralleled with high intercellular CO
<sub>2</sub>
concentration (Ci; 259 ppm) in the mesophyll and prodigious accumulation of starch granules (2.71 μm
<sup>2</sup>
) in the chloroplasts. Starch granules significantly reduced stroma size and caused disassembly and disruption of the internal membrane system, the grana and stroma lamellae. Concomitant with destruction of membrane assembly was the presence of numerous large plastoglobuli (15 in number). In contrast, A
<sub>CO2</sub>
increased and Ci declined in N-sufficient leaves. Furthermore, chloroplasts from N-sufficient leaves had well-developed grana and stroma lamellae in parallel alignment with a few small or no starch granules in the large stroma. Thus, it appeared that the loss of chloroplast ultrastructural integrity brought about by starch accumulation facilitated reductions in Chl concentration and CO
<sub>2</sub>
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<s5>01</s5>
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<s0>Assimilation</s0>
<s5>01</s5>
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<s0>Asimilación</s0>
<s5>01</s5>
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<s5>02</s5>
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<fC03 i1="02" i2="X" l="ENG">
<s0>Chloroplast</s0>
<s5>02</s5>
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<fC03 i1="02" i2="X" l="SPA">
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<s5>02</s5>
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<fC03 i1="03" i2="X" l="FRE">
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<s5>03</s5>
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<s0>Plant leaf</s0>
<s5>03</s5>
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<fC03 i1="03" i2="X" l="SPA">
<s0>Hoja vegetal</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Chlorophylle b</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Chlorophyll b</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Clorofila b</s0>
<s5>04</s5>
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<fC03 i1="05" i2="X" l="FRE">
<s0>Inhibition</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Inhibition</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA">
<s0>Inhibición</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE">
<s0>Echange gazeux</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG">
<s0>Gas exchange</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA">
<s0>Intercambio gaseoso</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE">
<s0>Amidon</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG">
<s0>Starch</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA">
<s0>Almidón</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE">
<s0>Chlorophylle a</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG">
<s0>Chlorophyll a</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA">
<s0>Clorofila a</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE">
<s0>Carbone dioxyde</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG">
<s0>Carbon dioxide</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA">
<s0>Carbono dióxido</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>15</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE">
<s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG">
<s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA">
<s0>Rutaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="FRE">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="ENG">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="SPA">
<s0>Spermatophyta</s0>
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