Limitations of net CO2 uptake in plant species of a temperate dry loess grassland

Z. Nagy, Zoltán Takács, Kálmán Szente, Z. Csintalan, Hartmut K. Lichtenthaler, Z. Tuba

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Possible limitations of net CO2 assimilation (PN) in four drought stressed loess grassland species (Festuca rupicola, Salvia nemorosa, Euphorbia pannonica, all three C3 plants, and Bothriochloa ischaemum, a C4 plant) were characterised using data from measurements of CO2 gas exchange (P(N), intercellular CO2 concentration C(i) and stomatal conductance G(s)) and the slow kinetics of chlorophyll fluorescence (variable Chl fluorescence decrease ratio, Rfd). The limitation imposed by Rubisco capacity was estimated from P(N)/C(i) curves. In leaves of the C3 plant F. rupicola, P(N) was mainly limited by the mesophyll diffusion resistance, most probably due to its sclerophyllous leaf structure. In S. nemorosa (C3) leaves, P(N) was significantly affected by all investigated factors with well balanced weights. In E. pannonica (C3), the order of limitations was stomatal-mesophyll without a photochemical limitation. In the C4-plant B. ischaemum, the limitation of P(N) was mesophyll-stomatal including a significant photochemical limitation. The most characteristic difference in the limitation of P(N) by the factors considered occurred in species in which photochemical reactions (Rfd-values) were not limiting (F. rupicola) or only to a small extent (E. pannonica) and where either mesophyll (F. rupicola) or stomatal (E. pannonica) limitations of P(N) were decisive. These species had either very low or very high CO2 assimilation rates and are either the maintainer of the original grassland vegetation (F. rupicola) or represent species associated with the degradation of the grassland (E. pannomca, B. ischaemum). Plant species with either a deep root system and succulent leaves (E. pannonica) or with the traits, such as high water use efficiency (WUE) associated with C4 photosynthesis (B. ischaemum), might be successful in an increasingly arid and disturbed environment. Photochemical limitation was significant in the invader B. ischaemum and the characteristic species S. nemorosa. These species exhibited their tolerance through a coordinated stomatal mesophyll and photochemical control.

Original languageEnglish
Pages (from-to)753-758
Number of pages6
JournalPlant Physiology and Biochemistry
Volume36
Issue number10
DOIs
Publication statusPublished - Oct 1998

Fingerprint

Bothriochloa ischaemum
loess
mesophyll
grasslands
Fluorescence
Ribulose-Bisphosphate Carboxylase
Photosynthesis
Photochemical reactions
Drought
Chlorophyll
C4 plants
C3 plants
Gases
Festuca
Salvia
Euphorbia
leaves
Degradation
Kinetics
Plant Leaves

Keywords

  • Chlorophyll fluorescence
  • Drought
  • Limitation of photosynthesis
  • Stomata

ASJC Scopus subject areas

  • Plant Science
  • Biochemistry
  • Biotechnology

Cite this

Limitations of net CO2 uptake in plant species of a temperate dry loess grassland. / Nagy, Z.; Takács, Zoltán; Szente, Kálmán; Csintalan, Z.; Lichtenthaler, Hartmut K.; Tuba, Z.

In: Plant Physiology and Biochemistry, Vol. 36, No. 10, 10.1998, p. 753-758.

Research output: Contribution to journalArticle

Nagy, Z. ; Takács, Zoltán ; Szente, Kálmán ; Csintalan, Z. ; Lichtenthaler, Hartmut K. ; Tuba, Z. / Limitations of net CO2 uptake in plant species of a temperate dry loess grassland. In: Plant Physiology and Biochemistry. 1998 ; Vol. 36, No. 10. pp. 753-758.
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