Study of the fitness from the CBP20 mutant Arabidopsis

Research output: Contribution to journalArticle


Drought stress tolerance is an important trait in horticultural practice and breeding. We found that an Arabidopsis mutant line with improved drought tolerance carried a lesion in the CBP20 gene, which is a member of the nCBC complex. The cbp20 mutant displays only mild pleiotropic morphological abnormalities, but elevated sensitivity to abscisic acid (ABA). Apparently this later property leads to fast stomatal closure and thus improved drought tolerance. We studied the physiological consequences of improved water retention in the cbp20 and other ABA oversensitive mutants, with special emphasis on changes of performance of photosynthetic apparatus and competitive fitness coupled with drought hardiness. We found that faster ABA responses of stomata do not impair photosynthetic capacity under non stressed conditions. We found that restricted gas exchange in cbp20 plants did not confer drought tolerance in the presence of competitors for water. These data reveal a new aspect of ecophysiology of water use in plants.

Original languageEnglish
Pages (from-to)2091-2094
Number of pages4
JournalCereal Research Communications
Issue numberSUPPL. 5
Publication statusPublished - Dec 1 2008


  • Abscisic acid
  • Arabidopsis
  • CBP20
  • Drought stress
  • Fitness studies

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Genetics

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