Using a direct amplification of genomic DNA from two Brassica rapa forms, we obtained two homologs of the CONSTANS gene, which controls the photoperiodic induction of flowering in Arabidopsis plants. The cloned fragments of B. rapa genome were identified as members of the CONSTANS-LIKE1 class. By aligning the nucleotide sequences of the CONSTANS gene and its homologs, three classes, CONSTANS, CONSTANS-LIKE1, and CONSTANS-LIKE2, were distinctly discerned by their primary structure. The pattern of restriction fragment length polymorphisms (RFLP) of the CONSTANS homologs in B. carinata, B. juncea, B. napus, B. nigra, B. oleracea, and B. rapa were genome-specific; in addition, the CONSTANS homologs were classified by plant geographic origin, and we assume that such classification is related to plant photoperiodic response.
Russian Journal of Plant Physiology – Springer Journals
Published: Apr 7, 2005
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