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Open Access item Salt-sensitive mutants of Chlamydomonas reinhardtii isolated after insertional tagging

Authors:Prieto, Rafael
Pardo, José M.
Niu, Xiaomu
Bressan, Ray A.
Hasegawa, Paul M.
Issue Date:Sep-1996
Publisher:American Society of Plant Biologists
Citation:Plant Physiology 112(1): 99-104 (1996)
Abstract:We describe the isolation of salt-sensitive Chlamydomonas reinhardtii mutants by insertional mutagenesis using the nitrate reductase (Nit1)gene. The plasmid pMN24, containing Nitl, was used for transformation of 305CW15 (nit1 cw75 mt+), and transformants were selected for complementation of the nit- phenotype. From 6875 nit+ colonies, four transformants (S4, S18, S46, and S66) were isolated that exhibited both Na+ and Li+ sensitivity (sod-), and another transformant (S33) was selected that exhibited sensitivity to Li+ but not Na+ (lit-) based on relative growth comparisons with the wild-type strain. S33, S46, and S66 were no more growth inhibited by sorbitol than was 305CW15. In comparison, S4 and S18 exhibited substantial growth inhibition in medium supplemented with sorbitol. Genetic analyses indicated that the salt-sensitive mutants were each defective in a single recessive gene. The mutant genes in S4 (sodl), S33 (lit1), and S66 (sod3) are linked to a functional copy of Nit1 and are presumably tagged with a pMN24 insertion.
Description:6 pages, 2 figuress, 3 tables, 35 references.
Publisher version (URL):http://dx.doi.org/10.2307/4277308
Appears in Collections:(IRNAS) Artículos

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