Preliminary Yield Trials ( Pyt )

1420 WordsJan 18, 20176 Pages
that third season plots will give rise to F4:6 seed which will be used to initiate Preliminary Yield Trials (PYT). Three selected parental genotypes and forty-five of the 100 F4:6 lines from season three will be tested during season one to four in PYTs composed of three replications in a standard randomized complete block design (RCBD). Those lines will be evaluated on organic farm land at two locations in South Dakota. During and after the growing season, procedures similar to those of previous seasons as well as additional quality traits will be collected and compiled for identification of the most desirable experimental lines for further consideration. Additional quality evaluation for oat samples from the PYT will include groat percent…show more content…
For example, with the advancement of season one materials into season two, season one will be repeated. Similarly, at the beginning of season three, procedures started during seasons two and one will also be repeated, and so on. Therefore, it will take four seasons to completely populate all phases of the new organic focused small grain breeding programs. For some promising crosses single seed descent (SSD) will be used to quickly develop homozygous lines that will be selected, and seed along to enter them into preliminary yield trials (PYT). Disease resistance (Fhb1, Fhb6, Fhb5A) and grain quality (Dx5+Dy10 subunits of Glu-D1) will be rapidly improved in available wheat lines performing well under organic production but lacking resistance or acceptable quality. Marker assisted/genomic assisted selection will be utilized for these traits. In oat, frequent changes in crown rust races significantly reduce the life-span of major resistance genes, and new sources of resistance are often overcome less than 5 years after the release of new cultivars. While several major genes for resistance to crown rust will be combined in new germplasm, an emphasis will also be placed to develop germplasm with horizontal resistance (involving multiple genes with minor effects) to provide more durable resistance against oat crown rust.

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