Remarkably, by using advanced molecular genetic technologies, the team of scientists discovered, that barley pollen is able to produce auxin by itself, independently from the mother plant. They identified a pollen specific enzyme, namely HvYUCCA4, which is responsible for the last step of auxin synthesis. The researchers used a mutant plant called male sterile genetic 38 , where HvYUCCA4 is not functional, and the pollen is unable to produce auxin and store starch.
"Our discoveries will have a strong impact in both fundamental plant research and applied cereal breeding", says Acosta."Barley pollen will be a great model system to study auxin synthesis and signaling without the pleiotropic effects commonly associated with auxin deficiency in other plants.
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