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PLANT PHYSIOLOGY , Vol 101, Issue 3 839-845, Copyright © 1993 by American Society of Plant Biologists
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ENVIRONMENTAL AND STRESS PHYSIOLOGY |
Mutants of Arabidopsis thaliana Capable of Germination under Saline Conditions
R. Saleki, P. G. Young and D. D. Lefebvre
Department of Biology, Queen's University, Kingston, Ontario, K7L 3N6, Canada
Three mutant strains of Arabidopsis thaliana var Columbia were selected for
their ability to germinate in elevated concentrations of NaCl. They were
not more tolerant than wild type at subsequent development stages.
Wild-type strains could not germinate at concentrations > 125 mM NaCl.
Two of mutant strains, RS17 and RS20, could withstand up to 225 mM, whereas
RS19 was resistant to 175 mM. The RS mutants could also germinate under
even lower osmotic potentials imposed by high concentrations of exogenous
mannitol (550 mM), whereas the effects of elevated levels of KCl, K2SO4,
and LiCl were similar among the mutants and wild type. Therefore, the
mutants are primarily osmotolerant, but they also possess a degree of ionic
tolerance for sodium. Sodium and potassium contents of seeds exposed to
high salinities indicated that the NaCl-tolerant mutants absorbed more of
these respective cations during imbibition. These higher internal
concentrations of potassium and sodium could contribute to the osmotic
adjustment of the germinating seeds to the low osmotic potential of the
external medium. Genetic analysis of F1 and F2 progeny of outcrosses
suggest that the salt-tolerant mutations are recessive and that they define
three complementation groups.
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