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Salt-tolerant mutants in glycophytic salinity response (GSR) genes in Catharanthus roseus

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Title Salt-tolerant mutants in glycophytic salinity response (GSR) genes in Catharanthus roseus
 
Creator Rai, S.P.
Luthra, R.
Kumar, S.
 
Subject Catharanthus roseus
Salt-tolerant mutants
Glycophytic salinity response
Proline
Glycine-betaine
Recessive Mendelian inheritance
 
Description The periwinkle Catharanthus roseus shares
glycophytic properties of crop plants. To contribute towards an understanding of the glycophytic response to
salinity, large populations of M2 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.
Grateful thanks are due to the Department of
Biotechnology, Government of India, for their partial support to
the concerned project
 
Date 2013-10-22T06:27:22Z
2013-10-22T06:27:22Z
2003
22 April 2002
 
Type Article
 
Identifier Theor. Appl. Genet., 106: 221-230
http://hdl.handle.net/123456789/33
 
Language en
 
Publisher Springer