Geographic variation in hexane extractable hydrocarbons in natural populations of Helianthus annuus (Asteraceae, Sunflowers)

摘要

Populations of Helianthus annuus L., ranging from eastern Oklahoma to North Dakota, to coastalsouthern California were sampled and the yields of total hydrocarbons (HC) from leaves determined. Thehighest yielding populations were in the Texas Panhandle (6.0 - 7.99%) and the lowest yields were inCamp Verde, AZ, NM mountains, Bozeman, MT, and ND - MN. Medium-high yields were found innorthern UT and southern ID. Three populations near Waco, TX had large yield differences ranging from4.9 to 6.2%, but a fourth population had a low 3.6%. Some native populations were contaminated bygermplasm from cultivated sunflowers and these populations had very low yields (2.6 - 3.6%).Population variability in HC yields varied geographically and also between nearby populations,suggesting the micro-habitat environments are important as well as limited genetic population size.Published on-line www.phytologia.org Phytologia 100(2): 153-160 (Jun 22, 2018). ISSN 030319430.