The late elongated hypocotyl mutation of Arabidopsis disrupts circadian rhythms and the photoperiodic control of flowering

Article Abstract:

The late elongated hypocotyl (lhy) mutation in the Arabidopsis produces day length-insensitive late-flowering plants. Aside from affecting flowering time, this dominant mutation also causes hypocotyl elongation and reduction in chlorophyll content. To further elucidate the phenotypic characters associated with this mutation, genetic studies of the Arabidopsos lhy were conducted. Results revealed that lhy mutation also cause arrhythmia for leaf movements as well as for three clock-regulated genes. It was also found to encode for a transcription factor with features of plant circadian clocks.

Circadian rhythms, Plant mutation, Photoperiodism

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FCA, a gene controlling flowering time in Arabidopsis, encodes a protein containing RNA-binding domains

Article Abstract:

The role of the FCA promoter in the regulation of flowering time in arabidopsis plants was analyzed via X-ray mutagenesis. The arabidopsis fca-mutants exhibited impaired plant development during the vegetative and reproductive stages. The transcript gamma was also characterized as the genetic factor that encodes the FCA protein which promoted the posttranscriptional cascade that regulated flowering time in arabidopsis.

Promoters (Genetics)

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The CONSTANS gene of Arabidopsis promotes flowering and encodes a protein showing similarities to zinc finger transcription factors

Article Abstract:

The constans (CO) gene of Arabidopsis appears to be a transcriptional activator required to promote flowering. Analysis of isolated CO revealed two zinc fingers in the amino acid sequence. This could indicate a DNA binding function, suggesting a transcription factor function.

Analysis, Phenotype, Phenotypes, Mutation (Biology), Mutation

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