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Restricted Index Selection for Total Alkaloids and Yield in Tobacco

Dep. of Genetics, Box 7614

E. A. Wernsman and W. W. Weeks

Dep. of Crop Science, Box 7620, North Carolina State Univ., Raleigh, NC 27695

^* Corresponding author.

A negative genetic correlation between yield and total alkaloids (TA) in tobacco, Nicotiana tabacum L., populations causes decreases in yield when selecting for increased TA. A restricted selection index was employed in an ‘NC13’ x ‘McNair 135’ population to increase TA and hold yield at the mean of the population. The genetic correlation in the base population was –0.67. After three cycles of full-sib family selection, TA had increased 2.5% of the mean per cycle and there had been no significant change in yield. The increase in TA was about 58% of that expected from direct selection for increased TA, where there would be an expected decrease in yield of 1.9% per cycle. Selection for increased TA also led to a correlated decrease in the ratio of particulate matter in smoke to TA in spite of a positive genetic correlation between particulate matter and TA.

Received for publication March 28, 1988.

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