Isolation and characterization of shs1, a sugar-hypersensitive and ABA-insensitive mutant with multiple stress responses.
To identify salt tolerance determinants, we screened for double mutants from a T-DNA tagged sos3-1 mutant population in the Arabidopsis Col-0 gl1 background. The shs1-1 (sodium hypersensitive) sos3-1 mutant was isolated as more sensitive to NaCl than sos3-1 plants. TAIL-PCR revealed that the introduced T-DNA was located 62 bp upstream of the initiation codon of an adenylate translocator-like protein gene on chromosome IV. SHS1 mRNA did not accumulate in shs1-1 sos3-1 plants although it accumulated in shoots of both sos3-1 and the wild type plants, indicating that this gene is inactive in the mutant. Genetic co-linkage analysis revealed that the mutation causing the phenotype segregated as a recessive, single gene mutation. This mutant showed altered sensitive responses to salt as well as to cold stress. It also demonstrated sugar sensitive and ABA insensitive phenotypes including enhanced germination, reduced growth, altered leaf morphology, and necrosis on leaves at an early growth stage. Sensitivity of sos3-1 shs1-1 root growth to LiCl, KCl, and mannitol was not significantly different from growth of sos3-1 roots. Further, expression of 35S::SHS1 in sos3-1 shs1-1 plants complemented NaCl and sugar sensitivity and partially restored the leaf morphology.
Inan
Gunsu
G
Center for Plant Environmental Stress Physiology, Purdue University, 625 Agriculture Mall Drive, West Lafayette, IN 47907-2010, USA.
Goto
Fumiyuki
F
Jin
Jing Bo
JB
Rosado
Abel
A
Koiwa
Hisashi
H
Shi
Huazhong
H
Hasegawa
Paul M
PM
Bressan
Ray A
RA
Maggio
Albino
A
Li
Xia
X
D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000235:genetics* / Q000502:physiology; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D002241:Carbohydrates / Q000494:pharmacology*; D003080:Cold Temperature; D004721:Endoplasmic Reticulum / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005816:Genetic Complementation Test; D018525:Germination / Q000235:genetics / Q000502:physiology; D005947:Glucose / Q000494:pharmacology; D008320:Maltose / Q000494:pharmacology; D009154:Mutation; D018515:Plant Leaves / Q000235:genetics / Q000254:growth & development; D030821:Plants, Genetically Modified; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012965:Sodium Chloride / Q000494:pharmacology
D029681:Arabidopsis Proteins; D002241:Carbohydrates; D011993:Recombinant Fusion Proteins; D012965:Sodium Chloride; D008320:Maltose; D000040:Abscisic Acid; D005947:Glucose
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