Differentially expressed genes associated with dormancy or germination of Arabidopsis thaliana seeds
Toorop, P.E. ; Barroco, R.M. ; Engler, G. ; Groot, S.P.C. ; Hilhorst, H.W.M. - \ 2005
Planta 221 (2005)5. - ISSN 0032-0935 - p. 637 - 647.
zaadkieming - genen - genexpressie - seed germination - genes - gene expression - ribosomal-protein genes - low-temperature - abscisic-acid - l heynh - gibberellins - desiccation - pathways - mutants - bodies - light
Differential display analysis using dormant and non-dormant Arabidopsis thaliana (L.) Heynh seeds resulted in a set of genes that were associated with either dormancy or germination. Expression of the germination-associated genes AtRPL36B and AtRPL27B, encoding two ribosomal proteins, was undetectable in the dry seed, low in dormant seed, and high under conditions that allowed completion of germination. Expression of these genes was also found to be light-regulated and to correlate with germination speed. Expression of the dormancy-associated genes ATS2 and ATS4, encoding a caleosin-like protein and a protein similar to a low-temperature-induced protein respectively, was high in the dry seed and decreased during germination. Expression of ATS2 and ATS4 was high in primary and secondary dormant seed but low in after-ripened or chilled seed. The expression of both genes was also light-regulated, but no relationship with temperature-dependent germination speed was found.
Analysis of natural allelic variation at seed dormancy loci of Arabidopsis thaliana
Alonso-Blanco, C. ; Bentsink, L. ; Hanhart, C.J. ; Vries, M.H.C. de; Koornneef, M. - \ 2003
Genetics 164 (2003)2. - ISSN 0016-6731 - p. 711 - 729.
quantitative trait loci - flowering time - abscisic-acid - l heynh - linkage map - germination - mutants - gibberellin - gene - light
Arabidopsis accessions differ largely in their seed dormancy behavior. To understand the genetic basis of this intraspecific variation we analyzed two accessions: the laboratory strain Landsberg erecta (Ler) with low dormancy and the strong-dormancy accession Cape Verde Islands (Cvi). We used a quantitative trait loci (QTL) mapping approach to identify loci affecting the after-ripening requirement measured as the number of days of seed dry storage required to reach 50% germination. Thus, seven QTL were identified and named delay of germination (DOG) 1-7. To confirm and characterize these loci, we developed 12 near-isogenic lines carrying single and double Cvi introgression fragments in a Ler genetic background. The analysis of these lines for germination in water confirmed four QTL (DOG1, DOG2, DOG3, and DOG6) as showing large additive effects in Ler background. In addition, it was found that DOG1 and DOG3 genetically interact, the strong dormancy determined by DOG1-Cvi alleles depending on DOG-3-Ler alleles. These genotypes were further characterized for seed dormancy/germination behavior in five other test conditions, including seed coat removal, gibberellins, and an abscisic acid biosynthesis inhibitor. The role of the Ler/Cvi allelic variation in affecting dormancy is discussed in the context of current knowledge of Arabidopsis germination.