A new hybrid plant has emerged in Kansas wheat fields. Through genetic and cytogenetic testing, it was determined to be a hybrid derived from wheat and triticale. This hybrid was confirmed in three locations in Kansas this year.
The mysterious hybrid was observed by Kansas Crop Improvement Association (KCIA) inspectors in Dickinson County and Marion County. In addition, a producer from south-central Kansas also found the same hybrid.
Samples from all three locations were sent to the National Agricultural Genotyping Center (NAGC) in North Dakota. They confirmed all three samples were identical. The NAGC used the NCBI public database and searched for a match using the BLAST algorithm. Based on the database results, they reported that the ITS2 region suggested the samples contained nuclear genomes of Secale and a Triticum species.
The Wheat Genetic Resource Center (WGRC) at Kansas State University provided further testing through a cytogenetic analysis of the seeds produced by the hybrid. Cytogenetics is a branch of genetics that involves the study of chromosomes. The cytogenetic analysis determined that the hybrid plant had 48 chromosomes: 41 wheat and 7 rye. The result indicated that the hybrid plant is likely derived from natural hybridization between hexaploid wheat and octoploid triticale.
In summary, the mystery plant found in Kansas wheat fields has been identified as a wheat x triticale hybrid. To the best of expert’s knowledge, this is the first time this specific hybrid has been found and identified. Over the course of my investigations says Marion Spiering, Manager of Field Services and Seed Certification KCIA. I grew tired of referring to it as “the wheat x triticale hybrid,” so I’ve informally started calling it “quadrotriticale” because it has both the Secale and Triticum species and to distinguish it from commercial triticale.
The seeds collected and tested by KCIA had an overall low fertility rate. It may show up more in areas where a lot of triticale cover crops are being used. In addition, it may also appear if a farmer saves seed from a wheat field that was grown next to a triticale field. The “quadrotriticale” plants were discovered due to the careful field inspection procedures required for Certified seed production. The “quadrotiticale” plants found by KCIA inspectors grew a little taller than the wheat, making them easy to spot. Like its parents, the hybrid is a bunch-type plant that can be pulled easily if it is found in any production field. Now that this hybrid has been identified, KCIA growers can easily locate it and rogue it out of their Certified seed fields. KCIA’s excellent seed growers and our superior Certified seed standards are more than up to the task of dealing with this new hybrid and continuing to produce high-quality wheat seed.
Acknowledgments
· The cytogenetic analysis was done by WGRC at KSU.
· The DNA sequencing was done by NAGC, ND.
· The seed germination test was done by KCIA Seed Lab.
· Thanks to Dr. Allan Fritz, K-State Wheat Breeder for his overall assistance with this project and help networking.
Information provided by Marion Spiering, Manager of Field Services and Seed Certification, Kansas Crop Improvement Association, [email protected]