48th TWC, Tob. Work. Conf., 2018, abstr. 15

Evaluation of dark fire-cured SRC (Stable Reduced Converter) lines with ZYVERT™ technology in Kentucky and Tennessee field trials

(1) University of Kentucky, Princeton KY USA; (2) University of Tennessee, Springfield TN USA

Field experiments were conducted at the University of Kentucky Research & Education Center in Princeton KY and at the University of Tennessee Highland Rim Research & Education Center in Springfield TN for five years (2013-2017) to compare agronomic field performance of SRC (Stable Reduced Converter) with ZYVERT™ technology dark tobacco lines to their counterpart standard LC (low converter) lines. SRC lines have been shown to have approximately 1/3 the nicotine to nornicotine conversion of LC lines, and therefore much lower potential for formation of N-nitrosonornicotine (NNN). SRC and LC comparisons made included the lines PD 7309, PD 7312, PD 7318, PD 7305, and PD 7319. Phenotypic characteristics of appearance and maturity of SRC lines were very similar to their counterpart LC lines in all of these experiments. Black shank resistance as seen in an additional field trial at a black shank site near Hopkinsville KY also showed that black shank resistance in SRC lines was similar to their LC counterparts. There were a few instances where the LC line had statistically higher yield than the corresponding SRC line in the field trials at Princeton and Springfield. However, any slight reductions in yield potential associated with SRC lines would be more than offset by the benefits of lower conversion and lower NNN. (Reprinted with permission)