Salt-tolerant mutants in glycophytic salinity response (GSR) genes in Catharanthus roseus
| Autor: | S. Kumar, Rajesh Luthra, Shashi Pandey Rai |
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| Rok vydání: | 2003 |
| Předmět: |
Genotype
Proline Catharanthus Mutant Sodium Chloride Genes Plant chemistry.chemical_compound Betaine Botany Genetics Alleles Crosses Genetic biology Homozygote General Medicine Catharanthus roseus biology.organism_classification Adaptation Physiological Complementation Salinity Phenotype chemistry Mutagenesis Seedling Germination Mutation Seeds Agronomy and Crop Science Biotechnology |
| Zdroj: | Theoretical and Applied Genetics. 106:221-230 |
| ISSN: | 0040-5752 |
| DOI: | 10.1007/s00122-002-1026-x |
| Popis: | The periwinkle Catharanthus roseus shares glycophytic properties of crop plants. To contribute towards an understanding of the glycophytic response to salinity, large populations of M(2) seeds having an origin in nitroso-methyl urea and ethyl methane sulphonate treatments were screened for germination with 250 mM of NaCl. Out of the nine mutant lines so recovered, which tolerated salt stress due to loss of the normal glycophytic salinity response ( GSR), the characteristics of six gsr mutants are reported here. All six, gsr-1 to gsr-6, differed from the wild-type in both seedling and adult-plant morphological characters beside being salt tolerant. The mutations in them were inherited as monogenic recessive alleles at the corresponding wild-type loci. The trans-complementation tests revealed that the gsr-1 to gsr-6 mutants specified six complementation groups. The mutant seedlings generally accumulated more proline and glycine betaine, constitutively, than the wild-type. The mutant plants transpired lower amounts of water and accumulated higher amounts of proline under drought stress. It was inferred that the products of the six GSR genes defined here are involved in the regulation of salt stress, as well as cell division, developmental and/or morphogenetic pathway(s), in C. roseus. |
| Databáze: | OpenAIRE |
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