Punctual mutations in lipoxygenase sequence expressed in black soybean seed coat

Mutações pontuais em sequências expressas da enzima lipoxigenase em tegumentos de sementes de soja de coloração preta

Abstracts

Lipoxygenase enzymes are relevant in several characteristics of soybean seeds, such as germination performance, storage capacity and tolerance to infection by microorganisms. In this sense, the study of allelic variations of the genes related to that enzyme may be promising for the development of molecular markers associated with phenotypic characteristics which are relevant to seed physiology. This study aimed to identify mutations in lipoxygenase sequence expressed in black soybean seed coat. After isolation of the sequence of interest by the cDNA-AFLP technique, such sequence was compared with sequences of nucleotides and proteins of the lipoxygenase present in yellow soybean seed coat. Analysis of multiple sequence alignment has shown an expressive number of changes in the sequence of nucleotides, which have resulted in the modification of 13 amino acids in the translated protein. The identification of such mutations widens the possibility for further studies involving the association of these allelic variations with phenotypic differences of interest to seeds physiology.

Glycine max; molecular marker; enzymes

Enzimas lipoxigenases possuem relevância em diversas características das sementes de soja, como desempenho germinativo, capacidade de armazenamento e tolerância ao ataque de microrganismos. Nesse sentido, o estudo de variações alélicas de genes relacionados a essa enzima podem ser promissores para o desenvolvimento de marcadores moleculares relacionados a caracteres fenotípicos de interesse a fisiologia de sementes. Este trabalho objetivou identificar mutações em sequência de lipoxigenase expressa em tegumentos de sementes de soja de coloração preta. Após isolamento da sequência de interesse pela técnica de cDNA-AFLP, a mesma foi comparada com sequências de nucleotídeos e proteínas da lipoxigenase presente em sementes de soja de coloração amarela. A análise do alinhamento múltiplo entre as sequências mostrou um número expressivo de alterações na sequência de nucleotídeos, as quais resultaram na modificação de 13 aminoácidos na proteína traduzida. A identificação dessas mutações abre a possibilidade para estudos futuros envolvendo a associação dessas variações alélicas com diferenças fenotípicas para caracteres de interesse a fisiologia de sementes.

Glycine max; marcadores moleculares; enzimas

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Publication Dates

• Publication in this collection
  21 June 2013
• Date of issue
  2013

History

• Received
  25 Oct 2012
• Accepted
  13 Feb 2013