Screened Seed Dr. Gary Palmer University of Kentucky.

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Presentation transcript:

Screened Seed Dr. Gary Palmer University of Kentucky

Screened Seed Anne Jack University of Kentucky

Screened Seed Letha Tomes Kentucky Seed Improvement

Screened Seed Paul Denton University of Tennessee

Screened Seed Andy Bailey University of Kentucky

Industry Issues Big issues in tobacco industry anti-smoking lobby buyout TSNAs nornicotine

What are TSNAs? Tobacco Specific NitrosAmines Nitrogen containing compounds known to be potentially carcinogenic Formed during curing Increase during storage of cured leaf

Major Factors Influencing TSNA Accumulation Curing conditions Storage conditions Nitrogen fertilization Varietal differences – nornicotine high nornicotine increases chance of high TSNAs

Nicotine Conversion One gene responsible for conversion of nicotine to nornicotine these plants are known as converters plants which do not have this mutation are known as non-converters Conversion varies with variety and seedlot can vary with site and season occurs during curing, senescence

Variation in Seedlots KY lot 1KY lot 2Other Source Unselected KY 9

Variation in Varieties 33 2 KY 16 L8

Variation in Site – VA TN 1TN 2NC KY 1KY 2KY 3

Nornicotine – why the fuss? Detrimental effect on smoke considered undesirable long before current interest in TSNAs Detrimental health effects Effect on TSNAs ALL THINGS BEING EQUAL, lower nornicotine = lower TSNAs low nornicotine no guarantee of low TSNA curing environment over-riding effect

NNN ppm vs % conversion

Why focus on nornicotine? So many variables affect TSNAs few can be controlled weather microbial populations Nornicotine is the one variable which can be controlled

What can the industry do? Screen seed to reduce conversion need to identify screened seed by renaming screened varieties screened cultivars re-released as “LC” cultivars LC = “low converter” eg TN 90 LC

What is Screening? Roguing converter plants out of seed crop (breeder & foundation seed) number & test plants individually cut out all plants above limit (3%) Use ethephon to drive plants to full potential

Screening (3%)

Ethephon Treatment

Effect of screening 82 Unscreened Screened TN 90 VA

Effect of Screening Lowers mean conversion does not necessarily eliminate all converter plants most dramatic with high converters reduced effect with low converters

Bottom Line Screened seed lower nornicotine will HELP reduce TSNAs – no guarantee Industry demand manufacturers want screened seed enable growers to meet requirements need to identify screened seedlots can only do this by renaming screened varieties

“LC” Varieties Screened varieties Re-released as “LC” varieties “LC” varieties available to growers in 2005 TN 90 LC, TN 86 LC, TN 97 LC, KT 200 LC, KY 907 LC NO difference except for conversion same for yield, quality, disease resistance TN 90 “LC” is still TN 90

Thank you