Thioredoxin h can regulate the redox environment in the cell and play an important role in the
germination of cereals. In the present study, the thioredoxin s antisense transgenic wheat with downregulation
of thioredoxin h was used to study the role of thioredoxin h in protein metabolism during
germination of wheat seeds, and to explore the mechanism of the thioredoxin s antisense transgenic
wheat seeds having high resistance to pre-harvest sprouting. The qRT-PCR results showed that the
expression of protein disulfide isomerase in the thioredoxin s antisense transgenic wheat was upregulated,
which induced easily forming glutenin macropolymers and the resistance of storage proteins
to degradation. The expression of serine protease inhibitor was also up-regulated in transgenic
wheat, which might be responsible for the decreased activity of thiocalsin during the germination. The
expression of WRKY6 in transgenic wheat was down-regulated, which was consistent with the decreased
activity of glutamine oxoglutarate aminotransferase. In transgenic wheat, the activities of glutamate
dehydrogenase, glutamic pyruvic transaminase and glutamic oxaloacetic transaminase were downregulated,
indicating that the metabolism of amino acid was lower than that in wild-type wheat during
seed germination. A putative model for the role of thioredoxin h in protein metabolism during wheat
seed germination was proposed and discussed.
Thioredoxin h can regulate the redox environment in the cell and play an important role in the
germination of cereals. In the present study, the thioredoxin s antisense transgenic wheat with downregulation
of thioredoxin h was used to study the role of thioredoxin h in protein metabolism during
germination of wheat seeds, and to explore the mechanism of the thioredoxin s antisense transgenic
wheat seeds having high resistance to pre-harvest sprouting. The qRT-PCR results showed that the
expression of protein disulfide isomerase in the thioredoxin s antisense transgenic wheat was upregulated,
which induced easily forming glutenin macropolymers and the resistance of storage proteins
to degradation. The expression of serine protease inhibitor was also up-regulated in transgenic
wheat, which might be responsible for the decreased activity of thiocalsin during the germination. The
expression of WRKY6 in transgenic wheat was down-regulated, which was consistent with the decreased
activity of glutamine oxoglutarate aminotransferase. In transgenic wheat, the activities of glutamate
dehydrogenase, glutamic pyruvic transaminase and glutamic oxaloacetic transaminase were downregulated,
indicating that the metabolism of amino acid was lower than that in wild-type wheat during
seed germination. A putative model for the role of thioredoxin h in protein metabolism during wheat
seed germination was proposed and discussed.
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