Photochemical activity and osmotic adjustment of some halophyte and xerophyte species in different microtopographic conditions

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The saline area of the Kiskunság region of Hungary has varied micro-topographic conditions with different plant communities. This study was performed in a dry sandy grassland community (Potentillo arenariae-Festucetum pseudovinae Soó (1938) 1940) and a neighbouring saline sandy grassland community (Lepidio crassifolii-Puccinellietum limosae Soó (1947) 1957). These are located at different elevations and have completely different floristic composition and physiognomy due to the soil characteristics and water availability. We assessed how the different environmental conditions during summer period might alter some physiological traits of two dominant xerophytes of sandy grassland (Achillea collina L., Festuca pseudovina Hack. ex Wiesb.) and two halophytes of saline grassland (Lepidium crassifolium (W. et K.), Puccinellia limosa (Schur) Holmbg.). The relationship between soil water potential and water content showed lower water availability for plants in the saline habitat as the high water soluble sodium content (900-2000 ppm) of this soil type limits water absorption. Both halophyte species in this study exhibited lower K/Na ratio than xerophyte species. Between the two halophytes L. crassifolium can be described as a "leaf/shoot sodium accumulator" species while P. limosa as a "leaf sodium avoider" species. The four species differed in proline accumulation. The salt adapted species had multifold accumulation of proline as compared to species of dry sandy grassland. The three microhabitats differing in total plant cover offered different microenvironmental conditions for L. crassifolium. Proline content was twice higher in leaves of this species in the microhabitats with high soil Na + content than in the closed microhabitat. Every species showed a transient reversible decrease of potential photochemical efficiency of PSII (F v/F m) at midday during the study period. In the saline habitat the midday depression of F v/F m for L. crassifolium was much larger than in case of P. limosa which reflected its higher susceptibility to photoinhibition. In sandy grassland F v/F m of A. collina was smaller than that of F. pseudovina. Mesophyll succulence index (Sm) expressing the ratio of water content to chlorophyll content was the highest in L. crassifolium (1.6-2.2 g H 2O mg -1 Chl). Sm was low in xerophyte species (0.5-1.1 g H 2O mg -1 Chl), and the lowest value was found for the F. pseudovina (0.54 g H 2O mg -1 Chl).

Original languageEnglish
Pages (from-to)131-139
Number of pages9
JournalCommunity Ecology
Volume9
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 2008

Fingerprint

Lepidium cartilagineum subsp. cartilagineum
halophyte
grasslands
Achillea collina
microhabitats
grassland
proline
halophytes
sodium
microhabitat
water content
leaves
xerophytes
water availability
soil water potential
water
ground cover plants
photoinhibition
vegetation structure
habitats

Keywords

  • Halophyte
  • Mesophyll succulence
  • Photochemical efficiency of PSII
  • Proline accumulation
  • Saline habitat
  • Xerophyte

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

@article{5ee9f17a10c8491db29c6025dac818ad,
title = "Photochemical activity and osmotic adjustment of some halophyte and xerophyte species in different microtopographic conditions",
abstract = "The saline area of the Kiskuns{\'a}g region of Hungary has varied micro-topographic conditions with different plant communities. This study was performed in a dry sandy grassland community (Potentillo arenariae-Festucetum pseudovinae So{\'o} (1938) 1940) and a neighbouring saline sandy grassland community (Lepidio crassifolii-Puccinellietum limosae So{\'o} (1947) 1957). These are located at different elevations and have completely different floristic composition and physiognomy due to the soil characteristics and water availability. We assessed how the different environmental conditions during summer period might alter some physiological traits of two dominant xerophytes of sandy grassland (Achillea collina L., Festuca pseudovina Hack. ex Wiesb.) and two halophytes of saline grassland (Lepidium crassifolium (W. et K.), Puccinellia limosa (Schur) Holmbg.). The relationship between soil water potential and water content showed lower water availability for plants in the saline habitat as the high water soluble sodium content (900-2000 ppm) of this soil type limits water absorption. Both halophyte species in this study exhibited lower K/Na ratio than xerophyte species. Between the two halophytes L. crassifolium can be described as a {"}leaf/shoot sodium accumulator{"} species while P. limosa as a {"}leaf sodium avoider{"} species. The four species differed in proline accumulation. The salt adapted species had multifold accumulation of proline as compared to species of dry sandy grassland. The three microhabitats differing in total plant cover offered different microenvironmental conditions for L. crassifolium. Proline content was twice higher in leaves of this species in the microhabitats with high soil Na + content than in the closed microhabitat. Every species showed a transient reversible decrease of potential photochemical efficiency of PSII (F v/F m) at midday during the study period. In the saline habitat the midday depression of F v/F m for L. crassifolium was much larger than in case of P. limosa which reflected its higher susceptibility to photoinhibition. In sandy grassland F v/F m of A. collina was smaller than that of F. pseudovina. Mesophyll succulence index (Sm) expressing the ratio of water content to chlorophyll content was the highest in L. crassifolium (1.6-2.2 g H 2O mg -1 Chl). Sm was low in xerophyte species (0.5-1.1 g H 2O mg -1 Chl), and the lowest value was found for the F. pseudovina (0.54 g H 2O mg -1 Chl).",
keywords = "Halophyte, Mesophyll succulence, Photochemical efficiency of PSII, Proline accumulation, Saline habitat, Xerophyte",
author = "O. Mile and G. Lakatos and I. M{\'e}sz{\'a}ros",
year = "2008",
doi = "10.1556/ComEc.9.2008.S.18",
language = "English",
volume = "9",
pages = "131--139",
journal = "Community Ecology",
issn = "1585-8553",
publisher = "Akademiai Kiado",
number = "SUPPL. 1",

}

TY - JOUR

T1 - Photochemical activity and osmotic adjustment of some halophyte and xerophyte species in different microtopographic conditions

AU - Mile, O.

AU - Lakatos, G.

AU - Mészáros, I.

PY - 2008

Y1 - 2008

N2 - The saline area of the Kiskunság region of Hungary has varied micro-topographic conditions with different plant communities. This study was performed in a dry sandy grassland community (Potentillo arenariae-Festucetum pseudovinae Soó (1938) 1940) and a neighbouring saline sandy grassland community (Lepidio crassifolii-Puccinellietum limosae Soó (1947) 1957). These are located at different elevations and have completely different floristic composition and physiognomy due to the soil characteristics and water availability. We assessed how the different environmental conditions during summer period might alter some physiological traits of two dominant xerophytes of sandy grassland (Achillea collina L., Festuca pseudovina Hack. ex Wiesb.) and two halophytes of saline grassland (Lepidium crassifolium (W. et K.), Puccinellia limosa (Schur) Holmbg.). The relationship between soil water potential and water content showed lower water availability for plants in the saline habitat as the high water soluble sodium content (900-2000 ppm) of this soil type limits water absorption. Both halophyte species in this study exhibited lower K/Na ratio than xerophyte species. Between the two halophytes L. crassifolium can be described as a "leaf/shoot sodium accumulator" species while P. limosa as a "leaf sodium avoider" species. The four species differed in proline accumulation. The salt adapted species had multifold accumulation of proline as compared to species of dry sandy grassland. The three microhabitats differing in total plant cover offered different microenvironmental conditions for L. crassifolium. Proline content was twice higher in leaves of this species in the microhabitats with high soil Na + content than in the closed microhabitat. Every species showed a transient reversible decrease of potential photochemical efficiency of PSII (F v/F m) at midday during the study period. In the saline habitat the midday depression of F v/F m for L. crassifolium was much larger than in case of P. limosa which reflected its higher susceptibility to photoinhibition. In sandy grassland F v/F m of A. collina was smaller than that of F. pseudovina. Mesophyll succulence index (Sm) expressing the ratio of water content to chlorophyll content was the highest in L. crassifolium (1.6-2.2 g H 2O mg -1 Chl). Sm was low in xerophyte species (0.5-1.1 g H 2O mg -1 Chl), and the lowest value was found for the F. pseudovina (0.54 g H 2O mg -1 Chl).

AB - The saline area of the Kiskunság region of Hungary has varied micro-topographic conditions with different plant communities. This study was performed in a dry sandy grassland community (Potentillo arenariae-Festucetum pseudovinae Soó (1938) 1940) and a neighbouring saline sandy grassland community (Lepidio crassifolii-Puccinellietum limosae Soó (1947) 1957). These are located at different elevations and have completely different floristic composition and physiognomy due to the soil characteristics and water availability. We assessed how the different environmental conditions during summer period might alter some physiological traits of two dominant xerophytes of sandy grassland (Achillea collina L., Festuca pseudovina Hack. ex Wiesb.) and two halophytes of saline grassland (Lepidium crassifolium (W. et K.), Puccinellia limosa (Schur) Holmbg.). The relationship between soil water potential and water content showed lower water availability for plants in the saline habitat as the high water soluble sodium content (900-2000 ppm) of this soil type limits water absorption. Both halophyte species in this study exhibited lower K/Na ratio than xerophyte species. Between the two halophytes L. crassifolium can be described as a "leaf/shoot sodium accumulator" species while P. limosa as a "leaf sodium avoider" species. The four species differed in proline accumulation. The salt adapted species had multifold accumulation of proline as compared to species of dry sandy grassland. The three microhabitats differing in total plant cover offered different microenvironmental conditions for L. crassifolium. Proline content was twice higher in leaves of this species in the microhabitats with high soil Na + content than in the closed microhabitat. Every species showed a transient reversible decrease of potential photochemical efficiency of PSII (F v/F m) at midday during the study period. In the saline habitat the midday depression of F v/F m for L. crassifolium was much larger than in case of P. limosa which reflected its higher susceptibility to photoinhibition. In sandy grassland F v/F m of A. collina was smaller than that of F. pseudovina. Mesophyll succulence index (Sm) expressing the ratio of water content to chlorophyll content was the highest in L. crassifolium (1.6-2.2 g H 2O mg -1 Chl). Sm was low in xerophyte species (0.5-1.1 g H 2O mg -1 Chl), and the lowest value was found for the F. pseudovina (0.54 g H 2O mg -1 Chl).

KW - Halophyte

KW - Mesophyll succulence

KW - Photochemical efficiency of PSII

KW - Proline accumulation

KW - Saline habitat

KW - Xerophyte

UR - http://www.scopus.com/inward/record.url?scp=84867378295&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84867378295&partnerID=8YFLogxK

U2 - 10.1556/ComEc.9.2008.S.18

DO - 10.1556/ComEc.9.2008.S.18

M3 - Article

VL - 9

SP - 131

EP - 139

JO - Community Ecology

JF - Community Ecology

SN - 1585-8553

IS - SUPPL. 1

ER -