Interactions between elevated CO2 and water stress in two winter wheat cultivars differing in drought resistance

Noémi Harnos, Szilvia Bencze, Tibor Janda, Angéla Juhász, Ottó Veisz

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Two winter wheat varieties (Alba, cultivated in Poland and usually having high biomass production, and the Hungarian variety Martonvásári 15, which has better drought tolerance) were grown in two phytotron chambers at 375 and 700 μmol mol-1 air CO2 concentration with three different levels of water supply, to evaluate the interactive effects of elevated CO2 concentration and drought stress on yield components and leaf photosynthetic activity. Elevated CO2 concentration had positive effects on the development of the plants and decreased the negative effects of drought, while the development of the more drought-tolerant variety Martonvásári 15 was hindered by elevated CO2 concentration at high water supplies. Grain yield was mainly affected by drought. The negative effects of water stress were partially compensated by elevated CO2 concentration. Gas exchange changed in different ways, depending of the duration of the treatments: low water supplies decreased the net photosynthesis, transpiration and stomatal conductivity of both varieties, while elevated CO2 concentration decreased them in the beginning then increased them by the 10th week of treatment.

Original languageEnglish
Pages (from-to)359-366
Number of pages8
JournalCereal Research Communications
Volume30
Issue number3-4
DOIs
Publication statusPublished - 2002

Keywords

  • CO concentration
  • Photosynthesis
  • Winter wheat
  • Yield components

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Genetics

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