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Corn+Soybean Digest

Technology Reduces Gossypol In Cotton Seed

Genetic technology developed by Agricultural Research Service (ARS) scientists and cooperators suggests that cottonseed could one day become a significant source of low-cost protein for the developing world.

The research team, headed by Keerti Rathore at the Institute for Plant Genomics and Biotechnology, Texas A&M University, and ARS chemists Robert D. Stipanovic and Lorraine S. Puckhaber in College Station, TX, found a way to genetically reduce the amount of the natural toxin known as gossypol in cottonseed.

By coupling what's known as RNA interference technology, or RNAi, with a seed-specific gene promoter, it's possible to significantly reduce cottonseed gossypol levels and not reduce the levels of gossypol and related compounds in the foliage, the team found. These compounds' presence in the foliage helps protect the plant from insect attacks.

Gossypol is a toxic pigment that can be safely ingested only by ruminant animals with complex stomachs, so most of the nutritious meal produced during cottonseed processing is currently sold as cattle feed.

Use of the RNAi technology to develop new cotton lines could lead to plants with low enough gossypol levels in the seed that the 44 million metric tons (mmt) of cottonseed produced yearly could be used to provide roughly 10 mmt of protein. This would help meet the total protein needs of almost a half billion people.

The research was published in a recent edition of the Proceedings of the National Academy of Sciences.

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