Epigenetic variation is a potential source of genomic and phenotypic variation among different individuals in a population, and among different varieties within a species. We used a two-tiered approach to identify naturally occurring epigenetic alleles in the flowering plant Arabidopsis: a primary screen for transcript level polymorphisms among three strains (Col, Cvi, Ler), followed by a secon...

Ecophysiological models predict quantitative traits of one genotype in any environment, whereas quantitative trait locus (QTL) models predict the contribution of alleles to quantitative traits under a limited number of environments. We have combined both approaches by dissecting into effects of QTLs the parameters of a model of maize (Zea mays) leaf elongation rate (LER; H. Ben Haj Salah, F. Ta...

In higher plants, RNA editing is a posttranscriptional process that converts C to U in organelle mRNAs. Although RNA editing in mitochondria occurs much more frequently than in chloroplasts, editing of exogenously supplied RNA substrates in vitro and in organello has shown that editing in the two organelles shares some common features. In particular, the 20 nucleotides upstream of the editing s...

An application of the Reaction Class Transition State Theory/Linear Energy Relationship (RC-TST/LER) is presented for the evaluation of the thermal rate constants of hydrogen abstraction reactions by H atoms from Polycyclic Aromatic Hydrocarbons (PAH). Two classes of reactions have been considered, namely hydrogen bonded to sixand five-membered rings, respectively, and twenty-two reactions have...

The natural variation in leaf and plant longevity in Arabidopsis thaliana was analysed in a set of 45 ecotypes and 155 recombinant inbred lines derived from a Cape Verde Islands (Cvi) x Landsberg erecta (Ler) cross. Post-bolting longevity was inversely related to time to flowering and rosette leaf number in the set of 45 ecotypes, with Cvi having the longest and Ler the shortest post-bolting lo...

The KEK B-Factory (KEKB) [1] consists of 3.5 GeV positron (LER) and 8.0 GeV electron (HER) rings and has more than 290 dipole and 150 wiggler magnets. Both the LER and the HER use four types of dipole magnets. Wiggler magnets are used for the LER. Three long flipflop coil systems were used to measure the transverse distribution of the integrated magnetic field along the beam direction. Each dip...

The locus of enterocyte effacement (LEE) is a 35 kb pathogenicity island involved in attaching and effacing (A/E) Escherichia coli enteric infection. The LEE is organized into five large transcriptional operons (LEE1-LEE5) and a few bi- and monocistronic instances. The LEE5 operon co-transcribes three genes, tir-cesT-eae, although cesT can be transcribed in a separate mRNA from its own proximal...

We used 52 Arabidopsis (Arabidopsis thaliana) accessions and developed a new set of 137 recombinant inbred lines between Landsberg erecta (Ler) and Nossen (No-0) to explore the genetic basis of phytochrome-mediated responses during deetiolation. Unexpectedly, most accessions showed weak or moderate hypocotyl growth and cotyledon unfolding responses to pulses of far-red light (FR). Crosses betwe...

doi: 10.1111/j.1399-3054.2006.00809.x Among the Arabidopsis thaliana accessions Columbia (Col), Landsberg erecta (Ler), and Wassilewskija (Ws), Ler and Ws showed higher copper (Cu) tolerance than Col, while accumulating more Cu. Thus, Cu tolerance did not appear to be related to metal exclusion. Rather, the higher Cu tolerance of Ler and Ws may reflect less Cu-induced nutrient deficiency as the...

The shoot apical meristem (SAM) of seed plants is the site at which lateral organs are formed. Once organ primordia initiate from the SAM, they establish polarity along the adaxial-abaxial, proximodistal and mediolateral axes. Among these three axes, the adaxial-abaxial polarity is of primary importance in leaf patterning. In leaf development, once the adaxial-abaxial axis is established within...