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- Title
Solute analysis and water relations of gametophyte mutants tolerant to NaCl in the fern, Ceratopteris richardii.
- Authors
Vogelien, D. L.; Hickok, L. G.; Augé, R. M.; Stodola, A. J. W.; Hendrix, D.
- Abstract
The <em>stl1</em> and <em>stl2</em> mutations confer low and high levels of NaCl tolerance to gametophytes of the fern <em>Ceratopteris richardii</em>, respectively. As an initial characterization of these mutations, the levels of various organic solutes, tissue ion content and water relations were examined in the wild-type and mutant strains in the absence and presence of 60 mol m-3 NaCl stress (a level which results in a 20, 15 and 0% reduction in gametophyte growth in the wild-type, <em>stl1</em> mutant and <em>stl2</em> mutant, respectively). All strains exhibited major changes in organic and inorganic solute levels and water relations in response to 60mol m-3 NaCl stress. Differences in organic solute levels and water relations between the wild-type and mutant strains in the absence and in response to 60mol m-3 NaCI stress were minimal. Analysis of tissue ion content showed that <em>stl1</em> was associated with a slight reduction in Na+ accumulation during 60mol m-3 NaCl stress. <em>stl2</em> was associated with (1) higher constitutive levels of K+ and (2) continued selective accumulation of K+ and reduced accumulation of Na+ during 60mol m-3 NaCl stress. A K+/Na+ ratio close to 1 was observed in the wild-type during 60mol m-3 NaCl stress, while higher ratios were detected in <em>stl1</em> and <em>stl2</em> (1.7 and 4.0, respectively). The findings of this study suggest that the tolerance imparted by <em>stl1</em> and <em>stl2</em> is associated with altered ion accumulation during NaCl stress, rather than an enhanced ability to accumulate organic solutes to be used for osmotic adjustment of the cytoplasm.
- Subjects
FERNS; CYTOPLASM; TISSUES; INORGANIC compounds; CERATOPTERIS; FERN gametophytes; SALT; OSMOSIS
- Publication
Plant, Cell & Environment, 1993, Vol 16, Issue 8, p959
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1993.tb00519.x